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Dynamics of Tangent Hyperbolic Fluid Past a Semi-infinite Plate with the Significance of Joule Heating, Thermal Radiation and Soret-Dufour Mechanisms 双曲切线流体流过半无限板的动力学与焦耳热、热辐射和索雷特-杜富尔机制的意义
Q2 Mathematics Pub Date : 2023-11-30 DOI: 10.37934/cfdl.16.2.162183
Falodun Olumide Bidemi, Funmilayo Helen Oyelami, Gladys Tharapatia, Florence Dami Ayegbusi, Cletus Onwubuoya
The present investigation concentrates on the unsteady flow of tangent hyperbolic liquid past a vertical plate under the influence of Lorentz force, Joule heating, and viscous dissipation. The mathematical modelling leads to nonlinear coupled partial differential equations (PDEs). Suitable non-dimensional quantities are applied to the governing PDEs to obtain dimensionless systems of equations. The transformed boundary layer PDEs are solved with the aid of the spectral relaxation method (SRM). The SRM employs the Gauss-Seidel techniques to linearize and decouple the system of nonlinear PDEs. The applied magnetic field acts as an opposition to the flow by producing the Lorentz force. The Weissenberg parameter, alongside the magnetic parameter, is observed to decline the velocity profile. An increment in thermal radiation parameter is observed to enhance the thickness of the hydrodynamic and thermal boundary layer. Therefore, the thermal condition and convective flow are improved with heat generation and thermal radiation in the flow phenomenon. This investigation is unique because it investigates the combined influence of Soret-Dufour and MHD, viscous dissipation, and Joule heating. This study plays a significant role in astrophysics, heat exchanger devices, MHD power generation, and geothermal energy extraction. When this study is compared to studies that have already been done, it agrees with those studies.
本研究集中探讨了在洛伦兹力、焦耳热和粘性耗散的影响下,切线双曲面液体流经垂直板的非稳态流动问题。数学建模导致非线性耦合偏微分方程 (PDE)。将适当的非量应用于支配偏微分方程,可得到无量纲方程组。转换后的边界层偏微分方程借助频谱松弛法(SRM)求解。SRM 采用高斯-赛德尔技术对非线性 PDE 系统进行线性化和解耦。外加磁场通过产生洛伦兹力对流动起反作用。观察到魏森堡参数与磁参数一起使速度曲线下降。热辐射参数的增加会增加流体力学和热边界层的厚度。因此,流动现象中的热量产生和热辐射改善了热条件和对流。这项研究是独一无二的,因为它研究了 Soret-Dufour 和 MHD、粘性耗散和焦耳热的综合影响。这项研究在天体物理学、热交换器设备、MHD 发电和地热能源提取方面发挥了重要作用。将本研究与已有研究进行比较,结果与这些研究一致。
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引用次数: 0
Characteristics Investigations of Ducted Ka4-70 Series Propeller with Boss Cap Fins Using Numerical and Experimental Method 用数值和实验方法研究带老板帽鳍片的风道式 Ka4-70 系列螺旋桨的特性
Q2 Mathematics Pub Date : 2023-11-30 DOI: 10.37934/cfdl.16.2.2441
Berlian Arswendo Adietya, I Ketut Aria Pria Utama, Wasis Dwi Aryawan, Dwi Wahyudi, Anis Kurniati Arifah, Baharuddin Ali, Bashofi Cahyo Buwono, Miftah, Warsito
Unconventional system that are generally adopted for ship propulsion are Ducted Propellers. These devices have recently been studied with medium-fidelity computational fluid dynamics code (based on the potential flow hypothesis) with promising results. Numerical and experimental comparison of ducted propeller with PBCF, case studies with Propeller Ka4-70 used combination ducted and PBCF Divergent. The study was done numerically using computational fluid dynamics (CFD) approach. The solver is based on the Reynolds-Averaged Navier-Stokes (RANS) solutions and turbulence modelling explicit algebraic stress model (EASM). The test data was obtained from CFD simulations consisting of the open propeller and combination Nozzle plus PBCF, but the experiment was done to Nozzle and PBCF only. All measurements were carried out from J = 0 to J = 1.0 with speeds from 0 m/s to 2.445 m/s. The results of the comparative investigation cases between numerical and experiment analysis from Ka4-70 propellers with Nozzle 19A and PBCF Divergent appears that between CFD and experiments, several phenomena are seen. (i) the Ka4-70 propeller without Nozzle 19A and PBCF divergent experienced large pressure at low-speed J = 0.1 to high-speed J = 0.7, but Ka4-70 propeller with Nozzle and PBCF divergent reach highest pressure at J = 0.1 to J = 0.5; (ii) the Ka4-70 propeller without 19A nozzle and PBCF divergent increases the flow velocity at the boss cap fins but does not increase the axial induce velocity, while Ka4-70 propeller using nozzle and PBCF divergent increases the axial induce velocity of the blade, but does not increase the flow velocity of the boss cap fins; (iii) Ka4-70 propeller without Nozzle and PBCF value increase of propeller η0 to 12% when ESD added in the form of Nozzle and PBCF when J is high, from J = 0.7 to J = 1.0. ; (iv) Ka4-70 propellers with Nozzle 19A and PBCF Divergent has very similar η0 from J=0 to J=1.0. CFD approach are still appropriate to be relied upon for the overall simulation.
一般用于船舶推进的非常规系统是管道推进器。最近,人们利用中等保真度的计算流体动力学代码(基于势流假设)对这些设备进行了研究,并取得了可喜的成果。对管道螺旋桨和 PBCF 进行了数值和实验比较,并对使用管道螺旋桨和 PBCF Divergent 组合的螺旋桨 Ka4-70 进行了案例研究。研究采用计算流体动力学(CFD)方法进行数值计算。求解器基于雷诺平均纳维-斯托克斯(RANS)解决方案和湍流建模显式代数应力模型(EASM)。测试数据来自 CFD 模拟,包括开放式螺旋桨和喷嘴加 PBCF 组合,但实验仅针对喷嘴和 PBCF。所有测量均在 J = 0 到 J = 1.0 之间进行,速度从 0 米/秒到 2.445 米/秒。对带有喷嘴 19A 和 PBCF Divergent 的 Ka4-70 螺旋桨进行的数值分析和实验分析的对比研究结果表明,CFD 和实验之间存在以下几种现象。(i) 不带喷嘴 19A 和 PBCF 分歧器的 Ka4-70 螺旋桨在低速 J = 0.1 至高速 J = 0.7 时压力较大,但带喷嘴和 PBCF 分歧器的 Ka4-70 螺旋桨在 J = 0.1 至 J = 0.5 时压力最大;(ii) 带喷嘴 19A 和 PBCF 分歧器的 Ka4-70 螺旋桨在低速 J = 0.1 至高速 J = 0.7 时压力较大,但带喷嘴和 PBCF 分歧器的 Ka4-70 螺旋桨在 J = 0.1 至 J = 0.5 时压力最大。5 时达到最高压力;(ii) 不带 19A 喷嘴和 PBCF 发散器的 Ka4-70 螺旋桨提高了叶片上盖鳍片的流速,但没有提高轴向诱导速度,而使用喷嘴和 PBCF 发散器的 Ka4-70 螺旋桨提高了叶片的轴向诱导速度,但没有提高叶片上盖鳍片的流速;(iii) 不使用喷嘴和 PBCF 的 Ka4-70 螺旋桨,当以喷嘴和 PBCF 形式加入 ESD 时,当 J 高时,螺旋桨 η0 至 12% 的值增加,从 J = 0.(iv) 采用喷嘴 19A 和 PBCF Divergent 的 Ka4-70 螺旋桨从 J=0 到 J=1.0 的 η0 非常相似。因此,采用 CFD 方法进行整体模拟仍然是合适的。
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引用次数: 0
Application of CFD Simulation to Determine the Optimal Horizontal Position of the Nozzle Inlet of a Propeller Flow Cooling System (PFCS) 应用 CFD 仿真确定螺旋桨冷却系统 (PFCS) 喷嘴入口的最佳水平位置
Q2 Mathematics Pub Date : 2023-11-30 DOI: 10.37934/cfdl.16.2.5566
Faisal Mahmuddin, Muhammad Iqshal Naitullah Jasman, Syerly Klara, Ahmad Fitriadhy
Research on the use of fluid flow caused by the propeller to be used for engine cooling is an interesting research topic. The system is known as the Propeller Flow Cooling System (PFCS). It is necessary to develop the most optimal position to produce maximum water discharge in this system. This research carried out simulation and analysis with an elliptical inlet nozzle as the utilization of the stern flow of the ship. This study aims to determine the difference in the volume of water generated from several horizontal positions of the nozzle inlet. In this study, the simulated horizontal distance of the inlet nozzle to the propeller at 0.7R propeller blade that is, 5 cm, 7.5 cm, 10 cm, 12.5 cm, 15 cm and using the computational dynamic fluid (CFD) method to analyze the optimal horizontal distance of the inlet nozzle which produces the highest water flow rate. Based on the research result, it was shown that the optimal horizontal distance of the inlet nozzle to the propeller is a distance of 7.5 cm. The water flow generated in the computational simulation in this case was 14.24 liters/minute. In that case, it can be concluded that the effect of the horizontal distance of the inlet nozzle on the propeller greatly affects the flow of water produced.
利用螺旋桨引起的流体流动来冷却发动机是一个有趣的研究课题。该系统被称为螺旋桨流冷却系统(PFCS)。在该系统中,有必要开发出产生最大排水量的最佳位置。本研究利用椭圆形进水喷嘴对船尾水流进行了模拟和分析。本研究旨在确定喷嘴入口几个水平位置产生的水量差异。在这项研究中,模拟了 0.7R 螺旋桨叶片上的进水口喷嘴到螺旋桨的水平距离,即 5 厘米、7.5 厘米、10 厘米、12.5 厘米、15 厘米,并使用计算动态流体(CFD)方法分析了产生最高水流量的最佳进水口喷嘴水平距离。研究结果表明,进水喷嘴到螺旋桨的最佳水平距离为 7.5 厘米。在这种情况下,计算模拟产生的水流量为 14.24 升/分钟。由此可以得出结论,螺旋桨上的进水喷嘴水平距离对产生的水流量有很大影响。
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引用次数: 0
Concept of Computational Fluid Dynamics Design and Analysis Tool for Food Industry: A Bibliometric 食品工业计算流体力学设计与分析工具的概念:文献计量学
Q2 Mathematics Pub Date : 2023-11-30 DOI: 10.37934/cfdl.16.2.123
M. Muktiarni, Nur Indri Rahayu, Ai Nurhayati, Andika Dutha Bachari, Affero Ismail
Technology that is currently in demand is CFD. By simulating fluid flow around a product on a computer, the computational fluid dynamics (CFD) technique allows designers of new products to be tested. This research aims to analyze the bibliometrics of CFD publications as a design tool in the food industry to determine concepts, trends, and contributions of previous research. Computational Fluid Dynamics (CFD) is a technology used to test product designs through computer simulations of fluid flow around the product. The use of technology in various industries, such as the food industry, is essential to create better products or services. This research uses a bibliometric analysis method supported by theoretical analysis. This research consists of 5 steps, namely (i) determining the research theme for formulating keywords, (ii) collecting publication documents, (iii) data processing, (iv) bibliometric analysis, and (v) preparing a report. The keywords used in this research are "Computational Fluid Dynamics Design (CFD) in Food Industry." The results of the publication search found a total of 211 documents from 1992 to 2023. The average number of publications was 6.59. The trend of CFD publications in the food industry was first carried out in 1992. The development of this publication has been fluctuating, and there has been an increase in publications in the last five years (2019 - 2023). Research publications regarding CFD in the food industry are grouped into 20 subject areas. Contributions to this research consisted of 159 authors, 160 affiliates, and 51 countries. Completing this research will likely provide information regarding publication sources and contributions made by several scientists from various affiliates and countries worldwide.
目前最热门的技术是 CFD。通过在计算机上模拟产品周围的流体流动,计算流体动力学(CFD)技术可以对新产品的设计者进行测试。本研究旨在分析作为食品行业设计工具的 CFD 出版物的文献计量学,以确定以往研究的概念、趋势和贡献。计算流体动力学(CFD)是一种通过计算机模拟产品周围流体流动来测试产品设计的技术。在各行各业(如食品行业)中使用技术对于创造更好的产品或服务至关重要。本研究采用文献计量分析方法,并辅以理论分析。本研究包括 5 个步骤,即:(i) 确定研究主题以制定关键词;(ii) 收集出版文献;(iii) 数据处理;(iv) 文献计量分析;(v) 编写报告。本研究使用的关键词是 "食品工业中的计算流体动力学设计(CFD)"。出版物检索结果发现,从 1992 年到 2023 年共有 211 篇文献。出版物的平均数量为 6.59 篇。食品工业中的 CFD 出版物趋势研究始于 1992 年。该出版物的发展起伏不定,最近五年(2019 - 2023 年)出版物数量有所增加。有关食品行业 CFD 的研究出版物分为 20 个主题领域。为这项研究做出贡献的有 159 位作者、160 家附属机构和 51 个国家。完成这项研究将有可能提供有关出版物来源的信息,以及来自世界各地不同分支机构和国家的多位科学家的贡献。
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引用次数: 0
Airflow Distribution Analysis of Reefer Container with Skipjack Tuna Load using Computational Fluid Dynamics 利用计算流体动力学对装载鲣鱼的冷藏集装箱进行气流分布分析
Q2 Mathematics Pub Date : 2023-11-30 DOI: 10.37934/cfdl.16.2.6775
Muhammad Arif Budiyanto, Muhammad Bukhari Robbani, Gerry Liston Putra, Achmad Riadi, Gunawan, Muhammad Iqbal
In the transportation of skipjack tuna to various destination countries, it is crucial to ensure that the skipjack tuna persists and remains of high quality. This study aims to analyse the airflow distribution inside the reefer container with the cargo load of skipjack tuna. The analysis carries out the computational fluid dynamics method to obtain appropriate airflow settings and investigate the temperature distribution inside reefer containers. The designed reefer container is 40ft with detailed structural variables of the T-bar and flat floor. The simulation result shows reefer containers that use the T-bar floor provide offer a thorough airflow distribution to cooling pallet stacks with full load conditions. The finding of the simulation results is the airflow rate of 5 m/s and the inlet temperature of -6°C will provide optimal cooling distribution.
在将鲣鱼运往不同目的地国家的运输过程中,确保鲣鱼的品质和质量至关重要。本研究旨在分析装载鲣鱼的冷藏集装箱内的气流分布。分析采用计算流体动力学方法,以获得适当的气流设置,并研究冷藏集装箱内的温度分布。设计的冷藏集装箱为 40 英尺,具有 T 形杆和平底的详细结构变量。模拟结果表明,使用 T 形杆地板的冷藏集装箱可在满载条件下为冷却托盘堆提供全面的气流分布。模拟结果表明,5 米/秒的气流速度和 -6°C 的入口温度将提供最佳的冷却分布。
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引用次数: 0
Effects of Electrification and Transverse Force on Dusty Flow over a Linear Stretching Sheet 电气化和横向力对线性拉伸片上尘埃流的影响
Q2 Mathematics Pub Date : 2023-11-30 DOI: 10.37934/cfdl.16.2.151161
Jayaprakash Mishra, Tumbanath Samantara, Pradeep Kumar Tripathy
The numerical investigation of the flow and heat transfer of steady dusty flow over a linear stretching sheet has been carried out. The effects of Transverse force and electrification has been incorporated in this problem. Modelling of the problem comprises of highly nonlinear partial differential equations that have been transferred to systems of ordinary differential equations by implementing suitable transformations. Since the equations are of boundary value problems in nature, have been transferred to initial value problem by using shooting method and then solved by RungeKutta 4th order technique. All the above numerical methods incorporated in the BVP4C tool of MATLAB and has been solved the systems of differential equations by using MATLAB software. The effects of different parameter like Prandtl number, Eckert number, transverse force, and electrification parameter on flow and heat transfer profile has been presented through graphs and tables. The results have been validated with previous authors. From the graph it is observed that the transverse force reduces the velocity of the particle phase in the flow where as electrification of particles raises the temperature of particle phase in the flow. The computations carried out with tolerance of order less than O (10^(-6) ).
对线性拉伸片上稳定尘埃流的流动和传热进行了数值研究。横向力和电气化的影响已被纳入该问题。该问题的建模包括高度非线性偏微分方程,通过适当的变换将其转换为常微分方程系统。由于这些方程在本质上属于边界值问题,因此采用射击法将其转换为初值问题,然后采用 RungeKutta 四阶技术进行求解。所有上述数值方法都已纳入 MATLAB 的 BVP4C 工具,并已通过 MATLAB 软件求解了微分方程系统。不同参数(如普朗特数、埃克特数、横向力和电气化参数)对流动和传热曲线的影响已通过图表呈现。研究结果与前人的研究结果进行了验证。从图中可以看出,横向力降低了流动中颗粒相的速度,而颗粒的电化则提高了流动中颗粒相的温度。计算公差小于 O (10^(-6) )。
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引用次数: 0
Magneto-Hydrodynamic Effects on Heat and Mass Transfer in Hybrid Nanofluid Flow over A Stretched Sheet with Cattaneo-Christov Model 卡塔尼奥-克里斯托夫模型对拉伸片上混合纳米流体流动中传热和传质的磁流体动力学效应
Q2 Mathematics Pub Date : 2023-11-30 DOI: 10.37934/cfdl.16.2.105117
D. Ramesh, M. Mohan Babu, G Balaji Prakash, K. Jhansi Rani, J. Peter Praveen, G. V. R. Reddy
This study uncovered a numerical simulation of the Williamson hybrid nanofluid's MHD on “heat and mass transfer flow” over a porous stretched sheet. The model made use of Cattaneo-Christov heat and mass fluxes. The situation's underlying physics is modelled using governing equations. Using an appropriate similarity transformation, these equations were transformed into a system of ordinary differential equations. Methodology/Approach: MATLAB software along with BVC4C tool is used to find the numerical solution of the problem. The study's findings show that while boosting the mass relaxation flux increases concentration distributions, doing so also increases temperature distributions. Thermal radiation, heat generation, and an additional value to improve temperature and velocity distributions, the Eckert number was measured. Major findings: Higher magnetic field values are shown to result in an increase in the velocity distribution because of the applied electromagnetic force. Additionally, a rise in the thermal radiation parameter is seen to broaden the distributions of velocity and temperature. Astrophysics, geophysics, biological sciences, and biomedical engineering are all helpful to this study. The findings of this study are generally well supported by the literature.
本研究揭示了威廉姆森混合纳米流体对多孔拉伸片上 "传热和传质流 "的 MHD 数值模拟。该模型使用了 Cattaneo-Christov 热通量和质量通量。这种情况的基本物理原理是通过控制方程来模拟的。通过适当的相似性转换,这些方程被转换成常微分方程系统。方法/途径:使用 MATLAB 软件和 BVC4C 工具对问题进行数值求解。研究结果表明,虽然提高质量弛豫通量会增加浓度分布,但同时也会增加温度分布。研究还测量了热辐射、发热量以及改善温度和速度分布的附加值--埃克特数。主要发现:由于施加了电磁力,较高的磁场值会导致速度分布增加。此外,热辐射参数的上升也会扩大速度和温度的分布。天体物理学、地球物理学、生物科学和生物医学工程学都对本研究有帮助。本研究的结果总体上得到了文献的充分支持。
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引用次数: 0
Investigation of Energy Dissipation for Different Breakwater Based on Computational Fluid Dynamic Model 基于计算流体动力学模型的不同防波堤能量耗散研究
Q2 Mathematics Pub Date : 2023-11-29 DOI: 10.37934/cfdl.16.1.2242
Uday Abdul, Sahib M. Alturfi, Abdul-Hassan K. Shukur
In this research, the hydraulic performance of the combined shape breakwaters was investigated through a laboratory study supported by a numerical mathematical model CFD to examine the different model shapes depending on the transmissions wave coefficient Ct. In order to stabilize the incident wave Hi with the same characteristics, waves were defined through the UDF file for CFD model. To investigated the performance of breakwaters base on energy dissipations, different models were tested under various wave condition, water depth, and relative submerged depth. Result of this study are showed that the Transmission coefficient are increased with increased of incident wave high for all type of breakwater model, and for all models of breakwater, transmission wave height (Ht) are increased with increased relative submerged depth (Hs/Hi). The highest value for energy dissipations (1 - Ct) % are received for zero submerged depth in model of sloped steps model (M2) is 80 %. Ansys Fluent solver are adopted to modelling the transit flow condition with dynamic mesh to represent the flap motion type to generate wave. Numerical beach plays an important role in CFD model to prevent the reflection wave in lee side of breakwater and represent the absorbing shoreline. 240 grid per wave length are selected for Mesh independent solution and make acceptable result comparison with experimental.
在本研究中,通过实验室研究和 CFD 数值数学模型对组合形状防波堤的水力性能进行了研究,以考察不同模型形状对透射波系数 Ct 的影响。为了研究防波堤的耗能性能,在不同的波浪条件、水深和相对浸没深度下测试了不同的模型。研究结果表明,对于所有类型的防波堤模型,透波系数都随着入射波高的增加而增加;对于所有防波堤模型,透波高度(Ht)都随着相对水深(Hs/Hi)的增加而增加。在倾斜阶梯模型(M2)中,零浸没深度时的能量耗散(1 - Ct)的最高值为 80%。采用 Ansys Fluent 求解器对过境流条件进行建模,并使用动态网格来表示产生波浪的襟翼运动类型。数值海滩在 CFD 模型中起着重要作用,可防止防波堤左侧的反射波,并代表吸收海岸线。每个波长选择 240 个网格进行网格独立求解,并与实验结果进行比较。
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引用次数: 0
Structural Analysis of a First, Second and Third Generation Horizontal Axis Hydrokinetic Turbine 第一代、第二代和第三代水平轴水力涡轮机的结构分析
Q2 Mathematics Pub Date : 2023-11-29 DOI: 10.37934/cfdl.16.1.7994
Cristian Cardona Mancilla, Jorge Sierra del Río, Alejandro Ruiz Sánchez, Edwin Correa Quintana, Carlos Arrieta González, Mario Luna Del Risco
The objective of this work is to evaluate through computational simulation the structural integrity of a horizontal axis hydrokinetic turbine (HAHKT) when using various geometric configurations of diffusers. This study was carried out by fluid -structure interaction (FSI) sing Ansys Workbench V18.2, coupling CFX and mechanical structural, in which a structural analysis was carried out based on the results obtained at the hydrodynamic level of a HAHKT composed of three blades with profile NREL S822, which was also analysed under the implementation of two geometric diffuser configurations. The maximum stresses in the blades increase of 27 % using the third-generation diffuser.
这项工作的目的是通过计算模拟来评估水平轴动能水轮机(HAHKT)在使用各种几何配置的扩散器时的结构完整性。这项研究采用流固耦合(FSI)技术,将 CFX 和机械结构耦合到 Ansys Workbench V18.2 中,根据在流体力学层面获得的结果,对由三个叶片组成的 HAHKT 进行了结构分析,叶片轮廓为 NREL S822。使用第三代扩散器时,叶片的最大应力增加了 27%。
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引用次数: 0
LES Investigation of a Piston-driven Synthetic Jet Actuator with Multiple Orifices 多孔活塞驱动合成射流致动器的 LES 研究
Q2 Mathematics Pub Date : 2023-11-29 DOI: 10.37934/cfdl.16.1.150170
Tung Duy Pham, Tomoaki Watanabe, K. Nagata
A piston-driven synthetic jet actuator has the potential for application in flow control and fundamental studies of turbulence, although the high-speed flow generated by this actuator is less investigated than a low-speed synthetic jet. The interaction of high-speed jets issued from a piston-driven synthetic jet actuator with multiple orifices is investigated with large eddy simulation (LES). The maximum jet Mach number is related to the maximum pressure inside the actuator regardless of the number of orifices. Temporal variations of the jet Mach number are almost identical for different cycles, and the jet formation in each cycle occurs under the same conditions despite the unsteady nature of the jet interaction. The phase-averaged statistics are used to examine the interaction of the synthetic jets. The converging, merging, and combined regions known for the interaction of continuous jets appear for the interaction of the high-speed synthetic jets slightly before the end of the blowing phase. However, the converging region is not clearly observed at the beginning of the blowing phase because the jets tend to be parallel to each other. Therefore, the combined region forms at a late stage of the blowing phase. Before the jets are combined, velocity fluctuations in the blowing phase become large near the furthest locations where the jets reach. Once the jets merge by their interaction, large velocity fluctuations are observed at the downstream end of the merging region. The probability density functions of velocity fluctuations in the blowing phase tend to deviate from a Gaussian distribution along the centerline of the jets. This deviation is more significant for the two-orifice model than for the four-orifice model under the same actuation frequency.
活塞驱动的合成射流致动器具有应用于流动控制和湍流基础研究的潜力,但与低速合成射流相比,对这种致动器产生的高速流动的研究较少。本文通过大涡流模拟(LES)研究了带有多个孔口的活塞驱动合成射流致动器产生的高速射流的相互作用。无论喷孔数量多少,最大射流马赫数都与致动器内部的最大压力有关。不同周期的射流马赫数的时间变化几乎相同,尽管射流相互作用具有不稳定性,但每个周期的射流形成条件相同。相平均统计量用于研究合成射流的相互作用。在吹气阶段结束前,高速合成射流的相互作用出现了已知的连续射流相互作用的会聚、合并和组合区域。然而,在吹气阶段开始时,由于喷流往往相互平行,因此无法清楚地观察到会聚区。因此,汇合区是在吹气阶段的后期形成的。在射流合并之前,吹气阶段的速度波动在射流到达的最远位置附近变得很大。一旦喷流在相互作用下合并,在合并区域的下游端就会观察到较大的速度波动。吹气阶段速度波动的概率密度函数沿射流中心线倾向于偏离高斯分布。在相同的驱动频率下,这种偏差在双喷口模型中比在四喷口模型中更为明显。
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引用次数: 0
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