外挂武器对无人直升机纵向气动特性影响研究

Influence of External Store Weapon on Longitudinal Aerodynamic Characteristics of Unmanned Helicopter

针对外挂武器对无人直升机纵向气动特性影响的问题,采用雷诺时均Navier-Stokes(Reynolds average Navier-Stokes,RANS)方法对加装武器系统前后,不同前飞速度、武器安装角和挂载状态下的气动特性进行了数值计算。然后将大速度前飞状态时的气动特性与加装外挂武器之前的风洞试验结果进行了对比分析。结果表明,采用悬臂梁外挂方式加装武器对阻力有显著影响,前飞速度和武器发射安装角变化对纵向气动特性几乎没有影响。外挂武器安装位置和数量变化对无人直升机的纵向气动特性影响很小。研究结果可为武装无人直升机选择合适的武器外挂和发射方式提供参考。

To study the influence of external store weapons on longitudinal aerodynamic characteristics of unmanned helicopter,the aerodynamic characteristics before and after installing the external store weapon are calculated by Reynolds average Navier-Stokes ( RANS) method with different flight speeds ,weapon installation angles and loading conditions. Then the aerodynamic characteristics of high speed flight state are compared with the wind tunnel test results that before installing the external store weapon. The results show that the influence of external store weapons with cantilever beam on the drag is relatively large,the changes of flight speed and weapon angle have little influence on aerodynamic characteristics,and the influence of loading conditions on the longitudinal aerodynamic characteristics of unmanned helicopter is small. The results can provide a reference for the choice of suitable mode of weapons external store and launch for armed unmanned helicopter.