亚声速谐振升力面的点偶极子法

本文介绍计算亚声速谐振薄翼非定常气动载荷的点偶极子法(DPM)。网格划分方式与偶极子网格法(DLM)相类似。此法将网格上的载荷分布集中置于网格中央剖面的1/4弦点上,控制点取在3/4弦点上,无需作数值积分计算。很容易用于计算形状复杂机翼的非定常气动载荷。 文中给出了矩形翼和后掠翼定常和非定常气动载荷的数值结果,其精度数值与DLM的相当,计算效率提高一倍。

Doublet Point Method for Harmonically Oscillating Lifting Surfaces in Subsonic Flow

In this paper, the doublet point method(DPM)is introduced, which is used for calculating the unsteady aerodynamic loadings on harmonically oscillating thin wings in subsonic flow. The formation of lattice is analogous to doublet lattice method (DLM). In this Method, the loading distribution on a lattice is concentrated at the point on the quarter chord at the midspan of the lattice. Three-quarter chord point at midspan is taken as the control point. This method does not include any quadratures, it can be applied easily to calculate the unsteady aerodynamic loading on complex planform wings. Numerical results of the steady and the unsteady aerodynamic loading are given for rectangular wings and swept-back wings, the numerical exactness is equivalent to DLM, the calculating efficiency of DPM is twice as large as DLM.