经纬网络充气机翼构形特征与气动性能分析

将充气机翼应用于临近空间太阳能飞行器是具有创新性的设计概念。针对充气机翼构形特征和气动分析的相关问题,对构形特征进行分析和设计,并建立经纬网络充气机翼的模型;进一步运用数值方法,通过与标准翼型对比,分析二维充气机翼、三维经纬网络充气机翼的气动性能。数值分析结果表明,在设计的雷诺数条件下,充气机翼的气动性能相比于标准翼型有所降低。在此基础上,结合对流场结构和流动机理的研究,分析出导致充气机翼总阻力系数明显增加的主要原因是:充气机翼表面许多凹陷的局部区域所形成的涡结构,导致局部的摩阻有小幅的减小,但压差阻力大幅增加,最终使得总的气动性能有所降低。

Analysis of configuration characteristics and aerodynamic performance on network inflatable wings

The inflatable wing is a good innovational conception for the near space solar-powered aircraft. This paper is mainly aimed at the problems of configuration characteristics and aerodynamic analysis of inflatable wings. First, configuration characteristics is analyzed and designed, then, the model of 3d network inflatable wing is developed; with computational fluid dynamics method, aerodynamic performances of 2d inflatable wing profile and 3d network inflatable wing are studied, which are also compared with the standard airfoil NACA0012. Numerical simulation result shows that the aerodynamic performances of 2d inflatable wing profile and 3d network inflatable wing have reduced slightly at the design Reynolds number. Meanwhile, with the structure of flow field and mechanism analysis, the reason for the total drag coefficients of inflatable wings increasing significantly is that, in those bumpy areas of the inflatable wing, there are vortexes which cause the friction drag has a reduction in some extent, but the pressure drag has a significant increase, so the total aerodynamic performance decreases.