一种用于获得飞机部件气动载荷的网格向量法

Grid-vector method for computation of aerodynamic loads on airplane components

提出了一种网格向量法用于计算飞机气动载荷,此方法以风洞测压数据为基础,网格化部件外形,使用网格点构造基础向量,采用空间向量法求解网格气动载荷的几何要素(如作用点、面积、单位法失、力臂及夹角等),进而获取飞机部件的总载荷及分布载荷。批量飞行载荷分析时,采用网格向量法先求得力与力矩系数的基础数据库,然后通过插值以获取批量计算工况下的载荷结果,计算效率得到显著提高。以某飞机起落架内舱门为例,分析了舱门气动载荷的计算特点,使用所提方法对主起落架内舱门进行了载荷计算分析,方法实施过程及计算结果表明所提方法操作简便、结果准确、普适高效,对飞机非典型翼面类部件的气动载荷求解,具有显著的优越性。

A grid-vector method based on pressure database from wind tunnel tests has been proposed and can be used to analyze aerodynamic loads of airplanes. This method is achieved by meshing grid for the surface of aerodynamic component and constructing basic vectors. For the calculation of grid aerodynamic loads, a space vector method is employed to compute the main factors including centers of grids, areas of grids, unit normal vectors, arms of grid forces, and angles. When large numbers of loads need to be analyzed, the basic database of force coefficient and moment coefficient are firstly acquired by the grid-vector method, and then all loads result can be computed by interpolation method to improve computing efficiency significantly. The results of a main landing gear inner door show that the grid-vector method is convenient, effective, and widely applicable. The advantage of this method is predominant for untypical components.