In this paper, we propose a parallelized optimization-based framework for autonomous and safe control of quadrotor Unmanned Aerial Vehicles (UAVs). We achieve this by designing a real-time optimal trajectory planner and a time-varying collision chance-constrained model predictive controller. We consider an obstacle with unknown dynamics in the operational space of the UAV and plan time-optimal transfer maneuvers using the shifted Chebyshev pseudospectral method. We propose a novel sigmoid function-based approximation to the conditional collision avoidance constraint of UAV trajectory segments and enable automatic differentiation for achieving real-time implementation. Given the uncertain positions of the UAV and the obstacle, we propose a time-varying probability margin for the collision avoidance constraint and design a chance-constrained model predictive controller to track the reference optimal trajectory with minimum tracking error and avoid collisions in real-time. Moreover, we parallelize the trajectory planner and the controller to address their asynchronous computational execution. The scalability and effectiveness of the proposed architecture are evaluated by performance analysis through Monte Carlo and numerical simulations. Finally, the real-time feasibility of the integrated approach is validated by indoor high-speed maneuvers and dynamic collision avoidance experiments.
{"title":"Fast trajectory optimization with time-varying chance-constrained model predictive control of quadcopters for dynamic collision avoidance","authors":"D.M.K.K. Venkateswara Rao , Hamed Habibi , Holger Voos","doi":"10.1016/j.ast.2026.111815","DOIUrl":"10.1016/j.ast.2026.111815","url":null,"abstract":"<div><div>In this paper, we propose a parallelized optimization-based framework for autonomous and safe control of quadrotor Unmanned Aerial Vehicles (UAVs). We achieve this by designing a real-time optimal trajectory planner and a time-varying collision chance-constrained model predictive controller. We consider an obstacle with unknown dynamics in the operational space of the UAV and plan time-optimal transfer maneuvers using the shifted Chebyshev pseudospectral method. We propose a novel sigmoid function-based approximation to the conditional collision avoidance constraint of UAV trajectory segments and enable automatic differentiation for achieving real-time implementation. Given the uncertain positions of the UAV and the obstacle, we propose a time-varying probability margin for the collision avoidance constraint and design a chance-constrained model predictive controller to track the reference optimal trajectory with minimum tracking error and avoid collisions in real-time. Moreover, we parallelize the trajectory planner and the controller to address their asynchronous computational execution. The scalability and effectiveness of the proposed architecture are evaluated by performance analysis through Monte Carlo and numerical simulations. Finally, the real-time feasibility of the integrated approach is validated by indoor high-speed maneuvers and dynamic collision avoidance experiments.</div></div>","PeriodicalId":50955,"journal":{"name":"Aerospace Science and Technology","volume":"174 ","pages":"Article 111815"},"PeriodicalIF":5.8,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146109800","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-07-01Epub Date: 2026-01-30DOI: 10.1016/j.ast.2026.111808
Runze Li , Shimin Wang , Zhidong Chi , Qi Wang , Bin Jiang
A redesign scheme for transonic rotors was conducted to enhance their aerodynamic performance through shock structure control. Improvements in aerodynamic efficiency were achieved by adjusting the shape of the blade leading-edge curve and the radial distribution of throat width. Validated numerical simulations were employed to analyze the changes in shock structure associated with the redesigned blade. The relationship between the radial distributions of leading-edge curvature and throat width and the 3D aerodynamic loading was investigated. The results demonstrate that the three-dimensionally redesigned transonic rotor is significantly improved in operating efficiency, and an increase in stall margin is observed, primarily due to an improved shock structure. Specifically, an additional radial pressure gradient is induced by tailoring the radial distribution of leading-edge curvature. This effectively modifies the blunt body shock near the leading-edge, and both the extent and associated losses of the high Mach number region on the pressure side are reduced. Furthermore, a more favorable rotor loading distribution is yielded by the new radial distribution of throat width. Notably, the shock detachment distance near the blade tip is reduced, and oblique shock intensity is weakened. The interaction between leakage vortices and shocks is also diminished, thereby reducing losses from low-energy fluid. These flow field improvements collectively contribute to a significant enhancement in aerodynamic performance. The best-performing rotor in the redesign set achieved a 2.55% increase in efficiency and a 12.01% increase in stall margin.
{"title":"Three-dimensional redesign method for high efficiency transonic compressors based on spatial shock wave control","authors":"Runze Li , Shimin Wang , Zhidong Chi , Qi Wang , Bin Jiang","doi":"10.1016/j.ast.2026.111808","DOIUrl":"10.1016/j.ast.2026.111808","url":null,"abstract":"<div><div>A redesign scheme for transonic rotors was conducted to enhance their aerodynamic performance through shock structure control. Improvements in aerodynamic efficiency were achieved by adjusting the shape of the blade leading-edge curve and the radial distribution of throat width. Validated numerical simulations were employed to analyze the changes in shock structure associated with the redesigned blade. The relationship between the radial distributions of leading-edge curvature and throat width and the 3D aerodynamic loading was investigated. The results demonstrate that the three-dimensionally redesigned transonic rotor is significantly improved in operating efficiency, and an increase in stall margin is observed, primarily due to an improved shock structure. Specifically, an additional radial pressure gradient is induced by tailoring the radial distribution of leading-edge curvature. This effectively modifies the blunt body shock near the leading-edge, and both the extent and associated losses of the high Mach number region on the pressure side are reduced. Furthermore, a more favorable rotor loading distribution is yielded by the new radial distribution of throat width. Notably, the shock detachment distance near the blade tip is reduced, and oblique shock intensity is weakened. The interaction between leakage vortices and shocks is also diminished, thereby reducing losses from low-energy fluid. These flow field improvements collectively contribute to a significant enhancement in aerodynamic performance. The best-performing rotor in the redesign set achieved a 2.55% increase in efficiency and a 12.01% increase in stall margin.</div></div>","PeriodicalId":50955,"journal":{"name":"Aerospace Science and Technology","volume":"174 ","pages":"Article 111808"},"PeriodicalIF":5.8,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146089655","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-07-01Epub Date: 2026-02-03DOI: 10.1016/j.ast.2026.111760
Zehao Xiong, Yexun Xi, Yizhe Cao, Chuan Li, Rong Li, Jie Li
Task allocation in UAV swarms is becoming increasingly complex due to the complexity of tasks, communication limitations, and the robustness of the allocation algorithm. Combining reinforcement learning and task allocation demonstrates great potential in enhancing algorithm performance and optimizing communication. However, existing research has overlooked the structural conflict between task conflicts and communication overhead, which leads to significant challenges in exploration and training instability. To this end, this paper introduces the Task Allocation with Communication Coordination (TACC) method, which aims to train a gated mechanism strategy to coordinate communication timing while balancing transmission efficiency and allocation reliability. First, the TACC is formalized as a POMDP, for which the channel access and other features are designed to facilitate observations. Actions are inter-agent adaptive gating mechanisms, and the shared reward reflects global task conflicts. Second, to address the asynchronous learning under the CTDE, an asynchronous experience aggregation method is proposed to align trajectories from different agents. Then, the MOCPO is proposed, which applies constrained policy optimization directly to the policy gradient via a Lagrangian loss, thereby stabilizing gated communication early in training and enhancing sample efficiency and convergence. The computational complexity, boundary conditions, convergence, and communication complexity of the TACC are theoretically analyzed. Finally, sim-to-real experiments are conducted in the HIL environment, and the results demonstrate the optimal trade-off achieved by the proposed method and its overall state-of-the-art approaches. Ablation studies and hyperparameter experiments further validated the stability of MOCPO. Specifically, the communication strategy is effectively deployed in the RK3588 SOC, and the flight experiment demonstrates the superior scheduling outcomes of TACC within the ten-UAV swarm in the search and rescue scenario.
{"title":"Task allocation with communication coordination in UAV swarms via asynchronous multi-Objective policy optimization","authors":"Zehao Xiong, Yexun Xi, Yizhe Cao, Chuan Li, Rong Li, Jie Li","doi":"10.1016/j.ast.2026.111760","DOIUrl":"10.1016/j.ast.2026.111760","url":null,"abstract":"<div><div>Task allocation in UAV swarms is becoming increasingly complex due to the complexity of tasks, communication limitations, and the robustness of the allocation algorithm. Combining reinforcement learning and task allocation demonstrates great potential in enhancing algorithm performance and optimizing communication. However, existing research has overlooked the structural conflict between task conflicts and communication overhead, which leads to significant challenges in exploration and training instability. To this end, this paper introduces the Task Allocation with Communication Coordination (TACC) method, which aims to train a gated mechanism strategy to coordinate communication timing while balancing transmission efficiency and allocation reliability. First, the TACC is formalized as a POMDP, for which the channel access and other features are designed to facilitate observations. Actions are inter-agent adaptive gating mechanisms, and the shared reward reflects global task conflicts. Second, to address the asynchronous learning under the CTDE, an asynchronous experience aggregation method is proposed to align trajectories from different agents. Then, the MOCPO is proposed, which applies constrained policy optimization directly to the policy gradient via a Lagrangian loss, thereby stabilizing gated communication early in training and enhancing sample efficiency and convergence. The computational complexity, boundary conditions, convergence, and communication complexity of the TACC are theoretically analyzed. Finally, sim-to-real experiments are conducted in the HIL environment, and the results demonstrate the optimal trade-off achieved by the proposed method and its overall state-of-the-art approaches. Ablation studies and hyperparameter experiments further validated the stability of MOCPO. Specifically, the communication strategy is effectively deployed in the RK3588 SOC, and the flight experiment demonstrates the superior scheduling outcomes of TACC within the ten-UAV swarm in the search and rescue scenario.</div></div>","PeriodicalId":50955,"journal":{"name":"Aerospace Science and Technology","volume":"174 ","pages":"Article 111760"},"PeriodicalIF":5.8,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146109775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-07-01Epub Date: 2026-02-09DOI: 10.1016/j.ast.2026.111885
Long Zhang, Wenlin Liao, Bowen Liu, Song Feng, Juntao Fan
This paper conducts experimental investigation and multi-scale simulation for the thermal-vibration characteristics of lattice-structured air rudders, aiming to provide a comprehensive understanding of how these complex structures behave under combined thermal and vibration loads. Firstly, a quartz infrared radiation heater device with independent control tunnels is designed and fabricated to produce thermal gradient loads on the air rudder in accordance with flight service condition. On this basis, thermal model test is performed on the rudder. In order to simulate the thermal-vibration behaviour, an orthotropic temperature-dependent material model is established, where in-situ samples of different directions have been printed simultaneously with the rudder and tested under various temperature conditions to fit the material model parameters. Afterwards, a multi-scale simulation method, which is capable of linking the mesoscopic lattice structures with the macroscopic material properties, is developed to simulate the thermal model test. The maximum absolute relative error between the simulated and tested natural frequencies is within 5.0%, and the simulated and tested mode shapes are in good agreement with each other, which proves that the developed method possesses good capability for computing natural frequencies and mode shapes of the lattice-structured air rudder under complicated thermal conditions. This combined approach enables a more thorough investigation of the thermal-vibration characteristics, leading to improved design and performance of lattice-structured air rudders.
{"title":"Thermal model test and multi-scale simulation method for the lattice-structured air rudder of hypersonic flight vehicle","authors":"Long Zhang, Wenlin Liao, Bowen Liu, Song Feng, Juntao Fan","doi":"10.1016/j.ast.2026.111885","DOIUrl":"10.1016/j.ast.2026.111885","url":null,"abstract":"<div><div>This paper conducts experimental investigation and multi-scale simulation for the thermal-vibration characteristics of lattice-structured air rudders, aiming to provide a comprehensive understanding of how these complex structures behave under combined thermal and vibration loads. Firstly, a quartz infrared radiation heater device with independent control tunnels is designed and fabricated to produce thermal gradient loads on the air rudder in accordance with flight service condition. On this basis, thermal model test is performed on the rudder. In order to simulate the thermal-vibration behaviour, an orthotropic temperature-dependent material model is established, where in-situ samples of different directions have been printed simultaneously with the rudder and tested under various temperature conditions to fit the material model parameters. Afterwards, a multi-scale simulation method, which is capable of linking the mesoscopic lattice structures with the macroscopic material properties, is developed to simulate the thermal model test. The maximum absolute relative error between the simulated and tested natural frequencies is within 5.0%, and the simulated and tested mode shapes are in good agreement with each other, which proves that the developed method possesses good capability for computing natural frequencies and mode shapes of the lattice-structured air rudder under complicated thermal conditions. This combined approach enables a more thorough investigation of the thermal-vibration characteristics, leading to improved design and performance of lattice-structured air rudders.</div></div>","PeriodicalId":50955,"journal":{"name":"Aerospace Science and Technology","volume":"174 ","pages":"Article 111885"},"PeriodicalIF":5.8,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146146827","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-07-01Epub Date: 2026-02-09DOI: 10.1016/j.ast.2026.111883
Qiyong Zhou, Song Lu, Hui Shi, Heping Zhang, Rui Chen
The recirculation zone flame is typical of the flame structure in aircraft nacelle. Based on a transient extinguishing agent injection experiment apparatus, the combustion and extinguishing of recirculation zone flame under the influence of blockage ratio and wind velocity were studied, and the fire extinguishing concentration in free flow and recirculation zone were measured. A modeling study was conducted on the dynamic evolution of the flame in the recirculation zone. The critical extinguishing concentration, fire extinguishing time, and characteristic mixing time (τ) were determined and correlated with flow parameters. Results show that obstacles increase local concentrations but also stabilize flames, raising the extinction threshold. Through analysis of the mean flame length, a dynamic evolution prediction model suitable for the mean flame length in the recirculation zone has been established. A revised correlation for τ was obtained, , which exceeds values reported under non-combustion conditions and highlights the stronger coupling between mixing and reactive processes. Application to aircraft nacelle scenarios indicates that, due to short discharge durations and obstruction effects, the required free flow concentration of HFC-125 exceeds nominal design specifications to ensure effective suppression in recirculation zones. This methodology provides a quantitative basis for performance evaluation of HFC-125 systems in safety-critical applications, supporting system safety assessments during early design and certification stages.
{"title":"Fire suppression of recirculation zone flames in aircraft nacelles: effects of blockage ratio and crossflow on extinction thresholds and mixing time","authors":"Qiyong Zhou, Song Lu, Hui Shi, Heping Zhang, Rui Chen","doi":"10.1016/j.ast.2026.111883","DOIUrl":"10.1016/j.ast.2026.111883","url":null,"abstract":"<div><div>The recirculation zone flame is typical of the flame structure in aircraft nacelle. Based on a transient extinguishing agent injection experiment apparatus, the combustion and extinguishing of recirculation zone flame under the influence of blockage ratio and wind velocity were studied, and the fire extinguishing concentration in free flow and recirculation zone were measured. A modeling study was conducted on the dynamic evolution of the flame in the recirculation zone. The critical extinguishing concentration, fire extinguishing time, and characteristic mixing time (<em>τ</em>) were determined and correlated with flow parameters. Results show that obstacles increase local concentrations but also stabilize flames, raising the extinction threshold. Through analysis of the mean flame length, a dynamic evolution prediction model suitable for the mean flame length in the recirculation zone has been established. A revised correlation for <em>τ</em> was obtained, <span><math><mrow><mi>τ</mi><mo>=</mo><mn>36.6</mn><mo>(</mo><mrow><msub><mi>h</mi><mi>s</mi></msub><mo>/</mo><msubsup><mi>U</mi><mi>a</mi><mo>*</mo></msubsup></mrow><mo>)</mo></mrow></math></span>, which exceeds values reported under non-combustion conditions and highlights the stronger coupling between mixing and reactive processes. Application to aircraft nacelle scenarios indicates that, due to short discharge durations and obstruction effects, the required free flow concentration of HFC-125 exceeds nominal design specifications to ensure effective suppression in recirculation zones. This methodology provides a quantitative basis for performance evaluation of HFC-125 systems in safety-critical applications, supporting system safety assessments during early design and certification stages.</div></div>","PeriodicalId":50955,"journal":{"name":"Aerospace Science and Technology","volume":"174 ","pages":"Article 111883"},"PeriodicalIF":5.8,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146146792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-07-01Epub Date: 2026-02-10DOI: 10.1016/j.ast.2026.111892
Z.H. Fu , W. Zhang , Y.F. Zhang
The rapid expansion of the low-altitude economy has created a growing demand for lightweight aircraft structures with high vibration resistance. To address this challenge, this study investigates the nonlinear vibrations of titanium matrix composites reinforced with twisted bilayer graphene (TBLG). A novel variable curvature shell function model, specifically designed for the complex geometries of low-altitude aircraft, to accurately capture nonlinear structural responses, is proposed to accurately capture nonlinear structural responses. Furthermore, a nonlinear functional gradient (FG-NX) distribution model of TBLG is proposed, extending beyond conventional uniform and FG-X schemes to better represent material gradation. Based on nonlinear shell theory and Rayleigh-Ritz method, the governing equations of motion are derived and solved using the harmonic balance method (HBM). The results reveal that the proposed FG-NX distribution significantly enhances structural stiffness, alters resonance characteristics, and induces complex dynamic behaviors including internal resonance, bifurcations, and chaos. These findings not only advance the fundamental understanding of nonlinear vibration in nanocomposite shells but also provide theoretical guidance for the lightweight design and vibration control of critical components in next-generation low-altitude aircraft.
{"title":"A variable curvature deep shell model for nonlinear vibrations of twisted bilayer graphene reinforced titanium composites","authors":"Z.H. Fu , W. Zhang , Y.F. Zhang","doi":"10.1016/j.ast.2026.111892","DOIUrl":"10.1016/j.ast.2026.111892","url":null,"abstract":"<div><div>The rapid expansion of the low-altitude economy has created a growing demand for lightweight aircraft structures with high vibration resistance. To address this challenge, this study investigates the nonlinear vibrations of titanium matrix composites reinforced with twisted bilayer graphene (TBLG). A novel variable curvature shell function model, specifically designed for the complex geometries of low-altitude aircraft, to accurately capture nonlinear structural responses, is proposed to accurately capture nonlinear structural responses. Furthermore, a nonlinear functional gradient (FG-NX) distribution model of TBLG is proposed, extending beyond conventional uniform and FG-X schemes to better represent material gradation. Based on nonlinear shell theory and Rayleigh-Ritz method, the governing equations of motion are derived and solved using the harmonic balance method (HBM). The results reveal that the proposed FG-NX distribution significantly enhances structural stiffness, alters resonance characteristics, and induces complex dynamic behaviors including internal resonance, bifurcations, and chaos. These findings not only advance the fundamental understanding of nonlinear vibration in nanocomposite shells but also provide theoretical guidance for the lightweight design and vibration control of critical components in next-generation low-altitude aircraft.</div></div>","PeriodicalId":50955,"journal":{"name":"Aerospace Science and Technology","volume":"174 ","pages":"Article 111892"},"PeriodicalIF":5.8,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146153021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-07-01Epub Date: 2026-02-06DOI: 10.1016/j.ast.2026.111773
Kapil Aryal , Vivek Nair , Nishith K R Gorla , Sandeep Patil , Brian H. Dennis
This paper compares two non-intrusive reduced-order models for predicting surface-pressure fields in inverse airfoil shape identification with deforming meshes. Proper Orthogonal Decomposition (POD) and feed-forward neural networks map geometric and flow parameters to POD coefficients for rapid field reconstruction. The models are trained on 200 CFD snapshots of steady two-dimensional laminar separated flow () using either coarse or fine meshes to quantify accuracy-cost trade-offs. Results show that the coarse-mesh model achieves accuracy similar to the fine-mesh model while reducing offline training cost by nearly sixfold. Both models exhibit similar robustness in inverse design under noisy targets, and the reduced-order formulation smooths discretization-induced noise in the objective function, improving optimizer convergence.
{"title":"Inverse airfoil shape identification using POD-ANN ROMs: A coarse Mesh approach for computational efficiency","authors":"Kapil Aryal , Vivek Nair , Nishith K R Gorla , Sandeep Patil , Brian H. Dennis","doi":"10.1016/j.ast.2026.111773","DOIUrl":"10.1016/j.ast.2026.111773","url":null,"abstract":"<div><div>This paper compares two non-intrusive reduced-order models for predicting surface-pressure fields in inverse airfoil shape identification with deforming meshes. Proper Orthogonal Decomposition (POD) and feed-forward neural networks map geometric and flow parameters to POD coefficients for rapid field reconstruction. The models are trained on 200 CFD snapshots of steady two-dimensional laminar separated flow (<span><math><mrow><mi>R</mi><mi>e</mi><mo>=</mo><mn>1000</mn></mrow></math></span>) using either coarse or fine meshes to quantify accuracy-cost trade-offs. Results show that the coarse-mesh model achieves accuracy similar to the fine-mesh model while reducing offline training cost by nearly sixfold. Both models exhibit similar robustness in inverse design under noisy targets, and the reduced-order formulation smooths discretization-induced noise in the objective function, improving optimizer convergence.</div></div>","PeriodicalId":50955,"journal":{"name":"Aerospace Science and Technology","volume":"174 ","pages":"Article 111773"},"PeriodicalIF":5.8,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146134790","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-07-01Epub Date: 2026-02-05DOI: 10.1016/j.ast.2026.111838
Sirui Yang , Chengwen Zhong , Hao Jin , Sha Liu , Congshan Zhuo
A simplified unified wave-particle method is adopted to analyze how the freestream Mach number, jet Mach number, jet temperature, angle of jet, and jet pressure ratio affect the flow field characteristics, aerodynamic forces, and aerothermal effects of the interaction between the jet and the freestream flow over a three-dimensional blunt cone model in rarefied nitrogen flow. The numerical results obtained using the present method are validated against those from the DSMC method. Some of the trends summarized from the parametric study are consistent with the literature. The influence of molecular internal energy of diatomic gases under rarefied gas effects on three-dimensional jet interactions is also presented. Significant differences are observed between three-dimensional jets of diatomic gases and those of monoatomic gases. The findings reveal that: 1) At a constant momentum ratio, the interference zone and barrel shock remain nearly unchanged, while higher freestream Mach numbers reduce the jet’s influence on the flow field; 2) At constant freestream conditions, lower jet Mach numbers increase the jet’s influence on the blunt cone wall, with the jet pressure ratio having a stronger effect than the jet Mach number; 3) When the jet temperature is sufficiently high, comparable control effectiveness can be achieved with a smaller amount of jet gas. 4) Reducing the angle of jet increases the control efficiency, and in the rarefied regime, a smaller angle of jet does not readily lead to flow instabilities. 5) As the jet pressure ratio increases, the jet momentum ratio also rises, thereby intensifying the interaction between the jet and the freestream flow and influencing a larger region of the flow field. This research will provide valuable references for the application of jet-control devices in near-space flight vehicles.
{"title":"Parametric study of lateral jet interaction in diatomic gas non-equilibrium flows using wave-particle method","authors":"Sirui Yang , Chengwen Zhong , Hao Jin , Sha Liu , Congshan Zhuo","doi":"10.1016/j.ast.2026.111838","DOIUrl":"10.1016/j.ast.2026.111838","url":null,"abstract":"<div><div>A simplified unified wave-particle method is adopted to analyze how the freestream Mach number, jet Mach number, jet temperature, angle of jet, and jet pressure ratio affect the flow field characteristics, aerodynamic forces, and aerothermal effects of the interaction between the jet and the freestream flow over a three-dimensional blunt cone model in rarefied nitrogen flow. The numerical results obtained using the present method are validated against those from the DSMC method. Some of the trends summarized from the parametric study are consistent with the literature. The influence of molecular internal energy of diatomic gases under rarefied gas effects on three-dimensional jet interactions is also presented. Significant differences are observed between three-dimensional jets of diatomic gases and those of monoatomic gases. The findings reveal that: 1) At a constant momentum ratio, the interference zone and barrel shock remain nearly unchanged, while higher freestream Mach numbers reduce the jet’s influence on the flow field; 2) At constant freestream conditions, lower jet Mach numbers increase the jet’s influence on the blunt cone wall, with the jet pressure ratio having a stronger effect than the jet Mach number; 3) When the jet temperature is sufficiently high, comparable control effectiveness can be achieved with a smaller amount of jet gas. 4) Reducing the angle of jet increases the control efficiency, and in the rarefied regime, a smaller angle of jet does not readily lead to flow instabilities. 5) As the jet pressure ratio increases, the jet momentum ratio also rises, thereby intensifying the interaction between the jet and the freestream flow and influencing a larger region of the flow field. This research will provide valuable references for the application of jet-control devices in near-space flight vehicles.</div></div>","PeriodicalId":50955,"journal":{"name":"Aerospace Science and Technology","volume":"174 ","pages":"Article 111838"},"PeriodicalIF":5.8,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146134812","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Most previous numerical studies have focused on simplified ice shapes, whereas the present work examines more realistic discontinuous ice shapes. A modified turbulence model incorporating a separating shear-layer correction is employed to assess the flow-separation characteristics and aerodynamic performance. Infinite swept wings were first studied to eliminate root and tip effects and subsequently two distinct separation mechanisms were identified: continuous ice produces a leading-edge separation bubble with a fixed separation point, whereas discontinuous ice triggers a trailing-edge separation. Aerodynamically, discontinuous ice causes severe lift degradation due to the non-lifting nature of the trailing-edge-separation region, whereas continuous ice leads to a larger drag penalty. Further analysis of the finite-span swept-wing configurations reveals pronounced three-dimensional effects. For the continuous-ice wing, a low-pressure separation bubble near the wing root substantially enhances the lift, increasing it by 63.3 % at a 4° angle of attack relative to the infinite-span case. In contrast, for the discontinuous-ice wing, the complex spanwise flow caused by the leading-edge gap jets weaken the tip vortex. The resulting reduction in pressure difference between the upper and lower surfaces suppresses the lift enhancement, yielding only a modest 4.6 % increase in the lift coefficient compared with the infinite-span configuration.
{"title":"Flow-separation simulations of continuous and discontinuous ice on swept wings","authors":"Jiawei Chen , Ziyu Zhou , Maochao Xiao , Yufei Zhang","doi":"10.1016/j.ast.2026.111891","DOIUrl":"10.1016/j.ast.2026.111891","url":null,"abstract":"<div><div>Most previous numerical studies have focused on simplified ice shapes, whereas the present work examines more realistic discontinuous ice shapes. A modified turbulence model incorporating a separating shear-layer correction is employed to assess the flow-separation characteristics and aerodynamic performance. Infinite swept wings were first studied to eliminate root and tip effects and subsequently two distinct separation mechanisms were identified: continuous ice produces a leading-edge separation bubble with a fixed separation point, whereas discontinuous ice triggers a trailing-edge separation. Aerodynamically, discontinuous ice causes severe lift degradation due to the non-lifting nature of the trailing-edge-separation region, whereas continuous ice leads to a larger drag penalty. Further analysis of the finite-span swept-wing configurations reveals pronounced three-dimensional effects. For the continuous-ice wing, a low-pressure separation bubble near the wing root substantially enhances the lift, increasing it by 63.3 % at a 4° angle of attack relative to the infinite-span case. In contrast, for the discontinuous-ice wing, the complex spanwise flow caused by the leading-edge gap jets weaken the tip vortex. The resulting reduction in pressure difference between the upper and lower surfaces suppresses the lift enhancement, yielding only a modest 4.6 % increase in the lift coefficient compared with the infinite-span configuration.</div></div>","PeriodicalId":50955,"journal":{"name":"Aerospace Science and Technology","volume":"174 ","pages":"Article 111891"},"PeriodicalIF":5.8,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146153019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-07-01Epub Date: 2026-02-03DOI: 10.1016/j.ast.2026.111816
Yongjie Shu , Qingkai Meng , Shiyi Wei , Mingkai Ding , Yunyi Wang , Xixing Long , Zhifang Ke , Wei Wei
By actively modulating thrust directions, multi-rotor thrust-vector aerial vehicles (TVAVs) overcome the underactuation inherent in conventional coplanar multirotor systems, thereby enabling enhanced maneuverability, full-attitude control, and robust operation in confined or highly disturbed environments. With increasing structural complexity and actuation redundancy, research efforts have progressively evolved from configuration design and aerodynamic analysis toward system-level dynamic modeling and, more recently, data-driven methodologies. This paper presents a comprehensive review of the research evolution in multi-rotor TVAVs, beginning with a summary of configuration and structural analysis methods that explicitly consider thrust-vectoring layouts and aerodynamic effects, and their influence on attainable force spaces, aerodynamic force distribution, and control capabilities. Subsequently, dynamic modeling approaches and investigations into system dynamic properties are reviewed, together with model-based trajectory generation and full-attitude control methods that ensure dynamic feasibility. Furthermore, recent advances in data-driven and reinforcement learning–based methods are systematically discussed, highlighting their potential in addressing strong nonlinearities, model uncertainties, and aggressive maneuvering tasks. Finally, the advantages and limitations of different research paradigms are compared, and the central role of control allocation in thrust-vectoring control architectures is examined, with the aim of providing a structured perspective on the evolution from configuration analysis to dynamic modeling and data-driven methods, and of offering insights toward future unified frameworks that integrate structural constraints, aerodynamic characteristics, model-based design, and data-driven intelligence.
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