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Hypersonic aerodynamic force balance using temperature compensated semiconductor strain gauges 使用温度补偿半导体应变片的高超声速气动力平衡
IF 2.3 3区 工程技术 Q2 ENGINEERING, MECHANICAL Pub Date : 2023-12-01 DOI: 10.1186/s42774-023-00160-2
Huacheng Qiu, Yanguang Yang, Peng Sun, Genming Chao, Yousheng Wu, Yingdong Chen
Metal foil strain gauges remain the state-of-the-art transducers for wind tunnel balances. While strain gauge technology is very mature, piezoresistive semiconductor sensors offer alternatives that are worth exploring to assess their unique benefits, such as better strain resolution and accuracy, which would enable balances to be designed with higher factors to safety and hence longer fatigue lifetimes. A new three-component balance, based on temperature compensated semiconductor strain gauges, is designed, calibrated and tested in a hypersonic low density wind tunnel. The static accuracy of the semiconductor balance is calibrated better than 0.3% FS, and the dynamic accuracy of the balance is established using a HB-2 standard model in a Mach 12 hypersonic flow. Good experimental repeatability is confirmed to be better than 2.5% FS, and the effectiveness of the balance is demonstrated by comparing the forces and moments of measured data with computational fluid dynamics simulations, as well as reference wind tunnel results under similar conditions.
金属箔应变计仍然是最先进的风洞平衡传感器。虽然应变计技术非常成熟,但压阻式半导体传感器提供了值得探索的替代方案,以评估其独特的优势,例如更好的应变分辨率和精度,这将使天平设计具有更高的安全系数,从而延长疲劳寿命。设计了一种基于温度补偿半导体应变计的新型三分量天平,并在高超声速低密度风洞中进行了标定和试验。在12马赫高超声速下,利用HB-2标准模型建立了半导体天平的动态精度,其静态精度优于0.3% FS。实验重复性优于2.5% FS,并将实测数据与计算流体力学模拟及参考风洞结果进行对比,验证了该平衡的有效性。
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引用次数: 0
Highly rarefied gas flows in rough channels of finite length 高度稀薄的气体在有限长度的粗糙通道中流动
IF 2.3 3区 工程技术 Q2 ENGINEERING, MECHANICAL Pub Date : 2023-11-22 DOI: 10.1186/s42774-023-00159-9
Zheng Shi, Yulong Zhao, Wei Su, Lei Wu
Highly rarefied gas flows through a rough channel of finite length with small bumps appended to its surfaces are investigated, by varying the accommodation coefficient $$alpha$$ in Maxwell’s diffuse-specular boundary condition, the characteristic size and position of the bumps, and the channel length. First, we study the influence of the surface bumps and consider the rarefied gas flow in a unit channel with periodic boundary conditions to remove the end effect. It is found that the surface bumps have a significant impact on the flow permeability. When $$alpha$$ is very small (i.e., nearly specular reflection of gas molecules at the channel surface), the apparent gas permeability is dramatically reduced, even in the presence of small bumps, to a value that is almost comparable to the one when fully diffuse gas-surface scattering is assumed. This impact can be taken into account through an effective accommodation coefficient, i.e., the permeability of the rough channel is taken equivalently as that of a smooth channel without bumps but having gas-surface scattering under the effective accommodation coefficient. Second, we study the end effect by connecting a smooth channel of length $$L_0$$ to two huge gas reservoirs. It is found that (i) the end correction length is large at small $$alpha$$ . Consequently, the mass flow rate barely reduces with increasing $$L_0$$ rather than scales down by a factor of $$1/L_0$$ as predicted by the classical Knudsen diffusion theory; and (ii) the end correction is related to the channel’s aspect ratio. Finally, based on the effective accommodation coefficient and end correction, we explain the exotic flow enhancement in graphene angstrom-scale channels observed by Geim’s research group (Keerthi et al, Nature 558:420–424, 2018).
通过改变麦克斯韦漫射-镜面边界条件下的调节系数$$alpha$$、凸起的特征尺寸和位置以及通道长度,研究了高稀薄气体在具有小凸起的有限长度粗糙通道中的流动。首先,我们研究了表面凸起的影响,并考虑了具有周期性边界条件的单元通道中的稀薄气体流动,以消除末端效应。研究发现,表面凸起对渗透率有显著影响。当$$alpha$$非常小时(即气体分子在通道表面的近镜面反射),即使存在小凸起,表观气体渗透率也会急剧降低,其值几乎与假设完全漫射气体表面散射时的值相当。这种影响可以通过有效调节系数来考虑,即粗糙通道的渗透率等同于在有效调节系数下没有凸起但存在气面散射的光滑通道的渗透率。其次,通过将长度为$$L_0$$的光滑通道连接到两个大型气藏,研究了末端效应。发现(i)末端修正长度在小$$alpha$$处较大。因此,质量流率几乎不随$$L_0$$的增加而减小,而不是像经典Knudsen扩散理论预测的那样按$$1/L_0$$的比例减小;(ii)终端校正与信道的宽高比有关。最后,基于有效调节系数和末端校正,我们解释了Geim研究小组观察到的石墨烯埃级通道中的外来流动增强(Keerthi et al ., Nature 558:420-424, 2018)。
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引用次数: 0
Reconstruction of skin friction topology in complex separated flows 复杂分离流的表面摩擦拓扑重建
IF 2.3 3区 工程技术 Q2 ENGINEERING, MECHANICAL Pub Date : 2023-11-22 DOI: 10.1186/s42774-023-00157-x
Tianshu Liu
This paper describes a theoretical method for reconstruction of the skin friction topology in complex separated flows, which is developed based on the exact relation between skin friction and surface pressure through the boundary enstrophy flux (BEF). The key of this method is that a skin friction field is reconstructed from a surface pressure field as an inverse problem by applying a variational method. For applications, the approximate method is proposed, where the composite surface pressure field is given by a linear superposition of the base-flow surface pressure field and the surface pressure variation field and the base-flow BEF field is used as the first-order approximation. This approximate method is constructive in a mathematical sense since a complex skin friction field in separated flows can be reconstructed from some elemental skin friction structures (skin friction source/sink, vortex and their combinations) by a linear superposition of some simple surface pressure structures. The distinct topological features, such as critical points, separation lines and attachment lines, naturally occur as a result of such reconstruction. As examples, some elemental skin friction structures in separated flows are reconstructed in simulations, and the skin friction fields in shock-wave/boundary-layer interactions (SWBLIs) are reconstructed from pressure sensitive paint (PSP) images obtained in wind tunnel experiments.
本文提出了一种基于表面摩擦与表面压力之间的精确关系,通过边界熵通量(BEF)重建复杂分离流动中表面摩擦拓扑结构的理论方法。该方法的关键是采用变分法将表面压力场作为反问题重构表面摩擦场。针对实际应用,提出了近似方法,将基流表面压力场与表面压力变化场线性叠加得到复合表面压力场,并采用基流BEF场作为一阶近似。这种近似方法在数学意义上是建设性的,因为分离流中的复杂蒙皮摩擦场可以通过一些简单的表面压力结构的线性叠加,从一些基本的蒙皮摩擦结构(蒙皮摩擦源/汇、涡流及其组合)中重建出来。这种重构的结果自然产生了不同的拓扑特征,如临界点、分离线和附着线。作为例子,在模拟中重建了分离流中的一些元素蒙皮摩擦结构,并利用风洞实验中获得的压敏涂料(PSP)图像重建了激波/边界层相互作用(SWBLIs)中的蒙皮摩擦场。
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引用次数: 0
Effects of non-stationary wind velocity models on buffeting performance of closed-box girder suspension bridges 非平稳风速模型对闭箱梁悬索桥抖振性能的影响
3区 工程技术 Q2 ENGINEERING, MECHANICAL Pub Date : 2023-10-17 DOI: 10.1186/s42774-023-00158-w
Rui Zhou, Yinan Lin, Peng Lu, Yongxin Yang, Jinbo Zhu
Abstract Non-stationary characteristic in nature wind has a great effect on buffeting performance of long-span bridges. The influence of key parameters in non-stationary wind velocity models on nonlinear buffeting responses of a super long-span suspension bridge was investigated in this paper. Firstly, four non-stationary wind velocity models are established by combing the time-varying average wind velocity with an exponential function and the fluctuating wind velocity with four modulation functions, respectively. These non-stationary wind velocity models have obvious non-stationary characteristics and then are validated by the classical power spectrum densities. Finally, three displacement responses of the bridge deck under four different independent variables of β in the exponential function and four modulation functions were compared, respectively. Results show that the turbulence intensities using two non-uniform modulation functions (NMF) are larger than those using uniform modulation functions (uMF). Moreover, the root mean square (RMS) values of three displacement responses increase with the decrease of β . Besides, the RMS values of three displacement under two NMFs are larger than those under two uMFs, and their RMS values under the second uMF are the smallest.
摘要自然风作用下桥梁的非平稳特性对大跨度桥梁的抖振性能影响很大。研究了非平稳风速模型中关键参数对某特大跨径悬索桥非线性抖振响应的影响。首先,将时变平均风速与指数函数相结合,将波动风速与4种调制函数相结合,分别建立了4种非平稳风速模型;这些非平稳风速模型具有明显的非平稳特征,并通过经典功率谱密度进行了验证。最后,比较了指数函数中4种自变量β和4种调制函数作用下桥面的位移响应。结果表明,使用两种非均匀调制函数(NMF)的湍流强度大于使用均匀调制函数(uMF)的湍流强度。三种位移响应的均方根(RMS)值均随β的减小而增大。另外,两种NMFs下三种位移的RMS值均大于两种uMF下的RMS值,且第二种uMF下的RMS值最小。
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引用次数: 0
Adaptive wave-particle decomposition in UGKWP method for high-speed flow simulations 高速流动模拟中UGKWP方法的自适应波粒分解
3区 工程技术 Q2 ENGINEERING, MECHANICAL Pub Date : 2023-10-03 DOI: 10.1186/s42774-023-00156-y
Yufeng Wei, Junzhe Cao, Xing Ji, Kun Xu
Abstract With wave-particle decomposition, a unified gas-kinetic wave-particle (UGKWP) method has been developed for multiscale flow simulations. With the variation of the cell Knudsen number, the UGKWP method captures the transport process in all flow regimes without the kinetic solver’s constraint on the numerical mesh size and time step being determined by the kinetic particle mean free path and particle collision time. In the current UGKWP method, the cell Knudsen number, which is defined as the ratio of particle collision time to numerical time step, is used to distribute the components in the wave-particle decomposition. The adaptation of particles in the UGKWP method is mainly for the capturing of the non-equilibrium transport. In this aspect, the cell Knudsen number alone is not enough to identify the non-equilibrium state. For example, in the equilibrium flow regime with a Maxwellian distribution function, even at a large cell Knudsen number, the flow evolution can be still modelled by the Navier-Stokes solver. More specifically, in the near space environment both the hypersonic flow around a space vehicle and the plume flow from a satellite nozzle will encounter a far field rarefied equilibrium flow in a large computational domain. In the background dilute equilibrium region, the large particle collision time and a uniform small numerical time step can result in a large local cell Knudsen number and make the UGKWP method track a huge number of particles for the far field background flow in the original approach. But, in this region the analytical wave representation can be legitimately used in the UGKWP method to capture the nearly equilibrium flow evolution. Therefore, to further improve the efficiency of the UGKWP method for multiscale flow simulations, an adaptive UGKWP (AUGKWP) method is developed with the introduction of an additional local flow variable gradient-dependent Knudsen number. As a result, the wave-particle decomposition in the UGKWP method is determined by both the cell and gradient Knudsen numbers, and the use of particles in the UGKWP method is solely to capture the non-equilibrium flow transport. The current AUGKWP method becomes much more efficient than the previous one with the cell Knudsen number only in the determination of wave-particle composition. Many numerical tests, including Sod shock tube, normal shock structure, hypersonic flow around cylinder, flow around reentry capsule, and an unsteady nozzle plume flow, have been conducted to validate the accuracy and efficiency of the AUGKWP method. Compared with the original UGKWP method, the AUGKWP method achieves the same accuracy, but has advantages in memory reduction and computational efficiency in the simulation for flows with the co-existing of multiple regimes.
摘要基于波粒分解,提出了一种统一的气体动力学波粒(UGKWP)多尺度流动模拟方法。随着单元Knudsen数的变化,UGKWP方法可以捕获所有流态下的输运过程,而不受动力学求解器对数值网格尺寸和时间步长的限制,该限制由动力学粒子平均自由程和粒子碰撞时间决定。在目前的UGKWP方法中,使用单元Knudsen数(定义为粒子碰撞时间与数值时间步长之比)来分配波粒分解中的分量。UGKWP方法对粒子的适应主要是为了捕获非平衡输运。在这方面,单凭细胞克努森数不足以识别非平衡态。例如,在具有麦克斯韦分布函数的平衡流态中,即使在较大的单元克努森数下,流动演化仍然可以用Navier-Stokes解算器来模拟。更具体地说,在近空间环境中,飞行器周围的高超声速流动和卫星喷管羽流都会遇到远场稀薄平衡流。在背景稀释平衡区,大颗粒碰撞时间和均匀的小数值时间步长导致局部单元Knudsen数较大,使得UGKWP方法在远场背景流中能够跟踪大量颗粒。但是,在这个区域,分析波表示可以合法地用于UGKWP方法来捕捉接近平衡的流动演变。因此,为了进一步提高UGKWP方法在多尺度流动模拟中的效率,本文提出了一种自适应UGKWP (AUGKWP)方法,该方法引入了一个额外的局部流动变量梯度相关的Knudsen数。因此,UGKWP方法中的波粒分解由单元克努森数和梯度克努森数决定,而UGKWP方法中粒子的使用仅仅是为了捕捉非平衡流输运。目前的AUGKWP方法在确定波粒组成方面比以前仅使用细胞Knudsen数的方法效率高得多。通过Sod激波管、正常激波结构、高超声速绕筒流、返回舱绕流和非定常喷管羽流等数值试验,验证了AUGKWP方法的准确性和有效性。与原始的UGKWP方法相比,AUGKWP方法在模拟多状态共存的流时获得了相同的精度,但在内存减少和计算效率方面具有优势。
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引用次数: 2
Numerical study on the combustion process in a gas turbine combustor with different reference velocities 不同参考速度下燃气轮机燃烧室燃烧过程的数值研究
IF 2.3 3区 工程技术 Q2 ENGINEERING, MECHANICAL Pub Date : 2023-09-05 DOI: 10.1186/s42774-023-00154-0
Cheng Gong, Shufan Zhao, Weiqiang Chen, Wenyu Li, Yu Zhou, Ming Qiu
{"title":"Numerical study on the combustion process in a gas turbine combustor with different reference velocities","authors":"Cheng Gong, Shufan Zhao, Weiqiang Chen, Wenyu Li, Yu Zhou, Ming Qiu","doi":"10.1186/s42774-023-00154-0","DOIUrl":"https://doi.org/10.1186/s42774-023-00154-0","url":null,"abstract":"","PeriodicalId":33737,"journal":{"name":"Advances in Aerodynamics","volume":"5 1","pages":"1-21"},"PeriodicalIF":2.3,"publicationDate":"2023-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47574111","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Static aeroelasticity analysis of a rotor blade using a Gauss-Seidel fluid-structure interaction method 基于Gauss-Seidel流固耦合方法的动叶静态气动弹性分析
IF 2.3 3区 工程技术 Q2 ENGINEERING, MECHANICAL Pub Date : 2023-08-22 DOI: 10.1186/s42774-023-00155-z
Jiaxing Li, Jiaqi Luo, Yaolong Liu, Zhonghua Han
{"title":"Static aeroelasticity analysis of a rotor blade using a Gauss-Seidel fluid-structure interaction method","authors":"Jiaxing Li, Jiaqi Luo, Yaolong Liu, Zhonghua Han","doi":"10.1186/s42774-023-00155-z","DOIUrl":"https://doi.org/10.1186/s42774-023-00155-z","url":null,"abstract":"","PeriodicalId":33737,"journal":{"name":"Advances in Aerodynamics","volume":"5 1","pages":"1-19"},"PeriodicalIF":2.3,"publicationDate":"2023-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42222316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Full Multi-wake Vortex Lattice Method: a detached flow model based on Potential Flow Theory 全多尾流涡格方法:一种基于势流理论的分离流动模型
IF 2.3 3区 工程技术 Q2 ENGINEERING, MECHANICAL Pub Date : 2023-08-09 DOI: 10.1186/s42774-023-00153-1
Jesus Carlos Pimentel-Garcia
{"title":"The Full Multi-wake Vortex Lattice Method: a detached flow model based on Potential Flow Theory","authors":"Jesus Carlos Pimentel-Garcia","doi":"10.1186/s42774-023-00153-1","DOIUrl":"https://doi.org/10.1186/s42774-023-00153-1","url":null,"abstract":"","PeriodicalId":33737,"journal":{"name":"Advances in Aerodynamics","volume":"5 1","pages":"1-26"},"PeriodicalIF":2.3,"publicationDate":"2023-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44161402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Predicting wing-pylon-nacelle configuration flutter characteristics using adaptive continuation method 用自适应延拓法预测机翼-塔架-机舱结构颤振特性
IF 2.3 3区 工程技术 Q2 ENGINEERING, MECHANICAL Pub Date : 2023-07-20 DOI: 10.1186/s42774-023-00152-2
Qijing Yu, M. Damodaran, B. Khoo
{"title":"Predicting wing-pylon-nacelle configuration flutter characteristics using adaptive continuation method","authors":"Qijing Yu, M. Damodaran, B. Khoo","doi":"10.1186/s42774-023-00152-2","DOIUrl":"https://doi.org/10.1186/s42774-023-00152-2","url":null,"abstract":"","PeriodicalId":33737,"journal":{"name":"Advances in Aerodynamics","volume":" ","pages":"1-24"},"PeriodicalIF":2.3,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48438178","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Optimization of aero-engine combustion chambers with the assistance of Hierarchical-Kriging surrogate model based on POD downscaling method 基于POD降尺度法的层次化kriging代理模型辅助航空发动机燃烧室优化
IF 2.3 3区 工程技术 Q2 ENGINEERING, MECHANICAL Pub Date : 2023-07-03 DOI: 10.1186/s42774-023-00151-3
Shuhong Tong, Yu-zhen Ma, Mingming Guo, Ye Tian, Wenya Song, Heng Wang, J. Le, Hua-Xin Zhang
{"title":"Optimization of aero-engine combustion chambers with the assistance of Hierarchical-Kriging surrogate model based on POD downscaling method","authors":"Shuhong Tong, Yu-zhen Ma, Mingming Guo, Ye Tian, Wenya Song, Heng Wang, J. Le, Hua-Xin Zhang","doi":"10.1186/s42774-023-00151-3","DOIUrl":"https://doi.org/10.1186/s42774-023-00151-3","url":null,"abstract":"","PeriodicalId":33737,"journal":{"name":"Advances in Aerodynamics","volume":" ","pages":"1-25"},"PeriodicalIF":2.3,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47827638","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
期刊
Advances in Aerodynamics
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