直升机机身外形对气动特性的影响

基于FLUENT流体力学软件,进行了直升机机身流场的数值模拟和分析。描述了网格生成方法,给出了计算迭代步骤和流程图。针对ROBIN机身绕流场进行了计算,并与可得到的实验结果进行了对比,验证了计算结果的可靠性。在此基础上,以NUAA模型机身为算例,改变机身尾部、截面和头部形状对其流场进行了对比计算,给出了表面压强系数分布、机身阻力等计算结果,讨论了直升机机身外形参数对气动特性的影响,得出了一些有意义的结论。

Influence of Helicopter Fuselage Shape on its Aerodynamic Characteristics

Based on the fluid dynamic software FLUENT,the flowfield of helicopter fuselages has been simulated and analyzed,and the corresponding grid generation method and iteration flow chart were described.The calculations on the flowfield around the ROBIN fuselage were carried out and the comparisons with available experimental data were made,which indicated that the calculated results were reliable.Then,the NUAA model fuselage was taken as numerical examples and the fuselage was modified so as to form different tail,nose and section configurations.Its flowfield for all the configurations were simulated and compared,and the surface pressure coefficient distribution and fuselage drag were presented.Based on the simulated results,the effects of helicopter fuselage shape parameters on its aerodynamic characteristics were discussed.Based upon the above calculations,several meaningful conclusions were obtained.