弹射座椅系统气动特性的计算流体动力学分析

IF 2 Q2 ENGINEERING, MECHANICAL
Md. Mahbubur Rahman, Ved Prakash, Sunil Chandel, D. G. Thakur, Robert Čep, Nitin Khedkar, Sachin Salunkhe, Emad S. Abouel Nasr
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引用次数: 0

摘要

本文利用市售计算流体动力学软件ANSYS Fluent对弹射座椅乘员的气动特性进行了研究,求解了三维reynolds -average Navier-Stokes方程,得到了弹射座椅系统的气动系数。在此分析中,利用ANSYS网格法生成了弹射座椅乘员的非结构化网格。进行了验证,并分析了三种不同湍流模型在0.6马赫下的性能。基于最合适的湍流模型,对弹射座椅乘员在马赫数为0.35、0.45、0.55、0.65和0.75时的气动系数进行了进一步分析。对于所有的马赫值,攻角以5°的增量从- 15°变化到15°,偏航角以10°的增量从0°变化到60°。结果表明,轴向力的大小随着迎角和偏航角的增大而减小。法向力系数和俯仰力矩系数也随着迎角的增大而减小。侧力系数、偏航力矩和滚转力矩系数随偏航角的增大而增大。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Analysis of the aerodynamic characteristics of an ejection seat system using computational fluid dynamics
In the present work, an investigation of the aerodynamic characteristics of an ejection seat occupant is carried out using the commercially available computational fluid dynamics software ANSYS Fluent. 3D Reynolds-averaged Navier–Stokes equations are solved to obtain the aerodynamic coefficients of the ejection seat system. For this analysis, an unstructured grid is generated for the ejection seat occupant using ANSYS meshing. Validation is carried out and the performance of three different turbulence models is analyzed at Mach 0.6. Based on the most suitable turbulence model, further analysis of the aerodynamic coefficients of the ejection seat occupant is calculated at Mach numbers of 0.35, 0.45, 0.55, 0.65, and 0.75. For all values of Mach, the angle of attack is varied from −15° to 15° in 5° increments and the yaw angle is varied from 0° to 60° in 10° increments. Based on the results, it is observed that the magnitude of the axial force decreases with increasing angle of attack and yaw angle. Similarly, the normal force coefficient and pitching moment coefficient decrease with increasing angle of attack. Finally, the side force coefficient, yawing moment, and rolling moment coefficients increase with increasing yaw angle.
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来源期刊
Frontiers in Mechanical Engineering
Frontiers in Mechanical Engineering Engineering-Industrial and Manufacturing Engineering
CiteScore
4.40
自引率
0.00%
发文量
115
审稿时长
14 weeks
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