临近空间太阳能飞翼无人机气动性能设计仿真

Aerodynamic Characteristics Design and Simulation of Solar-powered Flying Wing Unmanned air Vehicle of Nearspace

目前在进行临近空间太阳能无人机的设计时,通常采用常规布局,但常规布局的无人机在空气密度低的飞行环境中,速度小、动压小,气动性能较差,且常规布局飞机的表面不平整,不利于太阳能电池的大面积铺设;为此,特设计了一种飞翼布局的临近空间太阳能无人机,通过对翼型的气动仿真分析,优选出适合临近空间飞行环境、适用于飞翼无人机的反S型低雷诺数翼型,并采用翼梢外洗设计以改善无人机的稳定性,最后使用数值计算方法进行仿真计算,检验所设计飞翼无人机的气动性能;结果表明,根据数值方法仿真,所设计的临近空间太阳能飞翼布局无人机气动性能得到显著改善。

It mostly chooses conventional configuration to design the solar-powered unmanned air vehicle of near space recently,while the conventional unmanned air vehicle normally has poor aerodynamic characteristics due to low speed and low dynamic pressure in the near space with low air density and the unsmooth surface of conventional air vehicle is also not beneficial to lay the solar cells.To solve these problems,a flying-wing configuration is designed here for the solar-powered unmanned air vehicle of near space.The optimal airfoil is selected through simulation calculation of airfoils.Besides,the adoption of S-shaped airfoil and design on wash outside of wingtip play a crucial role in growing in stability of the solar-powered flying wing unmanned air vehicle.Finally,the numerical simulation has been done to examine the aerodynamic characteristics of the solar-powered flying wing unmanned air vehicle of near space.The results show that the aerodynamic characteristics of flying wing unmanned air vehicle of near space which uses these parameters are apparently improved.