地效翼气动力特性的数值预报

摘要

本文采用CFD技术,对存在地面效应时二维机翼在粘性流场中的空气动力特性进行了研究.结果表明:与模型试验数据相比,基于RANS方程的CFD方法能够准确预报机翼的气动升力和力矩.同时,除相对飞高外,翼剖面的厚度和拱度对地效翼的气动力特性也有重要影响.进而,作者对应用CFD分析或辅助地效翼气动力风洞试验进行了探讨.认为采用固定地板模拟地面效应与采用活动地板的模型风洞试验结果之间有很大差别,而风洞的壁面效应相比较而言可以忽略.%Aerodynamic characteristics of 2D wing in viscous flows in the presence of ground effect were investigated by CFD techniques.The investigation illustrated that the aerodynamic lift and pitching moment of wing can be predicted accurately by CFD based on RANS approach with comparison to model tests. The calculation results also showed that besides the relative ground clearance, the ratios of thickness and camber of wing profile have significant influence on the aerodynamics of WIGs.Furthermore,attempt was made to investigate the application of CFD to analysis,and/or aid the wind-tunnel tests of aerodynamics of WIGs. It is concluded that there is considerable discrepancy between the experimental results of model test in wind tunnel with the simulation of ground effects with fixed floor and moving floor,while the wall effects of wind tunnel are comparably negligible.