三维地效翼展向效应数值模拟  

Numerical simulation on span-dominated ground effect of 3D wing in ground effect

作　　者：杨韡[1] 杨志刚[1] 

机构地区：[1]同济大学上海地面交通工具风洞中心,上海201804

出　　处：《计算机辅助工程》2008年第3期13-17,共5页Computer Aided Engineering

基　　金：长江学者和创新团队发展计划

摘　　要：为研究地效翼的展向效应,利用FLUENT软件求解定常不可压N-S方程和标准k-ε湍流模型,对在地面效应下三维地效翼的流场进行数值模拟.首先,对给定面积和离地高度下不同展弦比的地效翼进行数值模拟;然后,对给定弦长和相对飞行高度下不同展弦比和带端板的地效翼进行数值研究.计算结果给出不同展弦比和带端板地效翼的气动特性曲线,揭示展弦比和端板对翼尖涡涡核位置和下洗角的影响规律.在地面效应下,机翼的展向效应更为明显,端板将进一步提高机翼的空气动力性能;翼尖涡的位置受地面影响向外移动,下洗角相应减小.研究结果为地效飞行器的设计与优化提供理论依据.To study the Span Dominated Ground Effect （SDGE） of wing in ground effect, the N-S equations of steady incompressible flow and the standard k-ε turbulence model are solved by FLUENT, and the flow of 3D wing in ground effect is simulated under the ground effect. Firstly, given an area and a ground clearance, the wings in ground effect with different aspect ratios are simulated. Secondly, given a chord length and a relative ground clearance, the wings in ground effect with different aspect ratios and endplate are simulated. The curves of aerodynamic characteristics are provided for the wings in ground effect with different aspect ratios and endplate, the effects of aspect ratio and endplate on the position of wingtip vortex core and downwash angle are revealed. The SDGE is more prominent under the ground effect and the endplate further strengthens the aerodynamic performance of the wings; the wingtip vortex moves outwards due to the existence of the ground and the downwash angle is reduced. The simulation results provide theoretical basis for the design and optimization on the crafts of wing in ground effect.

关 键 词：地效翼 展向效应 端板 下洗角 翼尖涡 数值模拟 FLUENT 

分 类 号：V211.4[航空宇航科学与技术—航空宇航推进理论与工程]