基于CFD的软式空中加油锥套气动特性研究

Study on aerodynamics of drogues for aerial refueling system based on CFD

无人机空中加油缺少人为的观测与控制,若要进行自主控制下的空中加油,获取精准的气动数据则十分关键。基于CFD研究了国外某型锥套的气动特性,通过改变锥套支撑臂数量、空速以及稳定伞面积3个因素,构建了不同的三维子模型。利用数值计算分析了其对锥套气动参数的影响,并探究了影响规律。仿真结果表明,支撑臂数量和稳定伞面积均会影响阻力系数,而空速对阻力系数几乎没有影响。该方法可以用来预测影响因素发生变化时锥套阻力系数的变化趋势,为分析锥套气动特性提供了理论依据。

Aerial refueling for Unmanned Aerial Vehicles（UAVs） is lack of manual operation. It＇s cruci- al to obtain precise data for an autonomous aerial refueling of UAVs. In this paper, the aerodynamics of a foreign drogue was studied based on computational fluid dynamics（CFD）. Different 3D sub-models were constructed by means of varying the number of strut, airspeed and canopy area for analyzing their influ- ences on aerodynamic parameters using numerical methods and the influence rules were explored. Simu- lation results show that both the number of strut and canopy area have influence on aerodynamic parame- ters, but airspeed hasn＇ t. The research indicates that the approach allows predicting the drag coefficient of drogue when influence factors of drogue change and provides theoretical basis for analyzing the charac- teristics of drogues.