有攻角细长旋成体极端地面效应分析

本文用匹配摄动方法研究了细长旋成体贴近地面运动时诱导的不可压缩势流问题,它是经典细长体理论的推广和发展。文中将流场分为内外两个渐近区域,建立了问题的匹配摄动理论,并利用文献1]中的双圆诱导不可压缩势流的精确解,给出了该问题的首阶解析解。然后又导出了细长体上的吸力和俯仰力矩的计算公式。在此基础上,文中对细长旋成体极端地面效应的运动学规律和动力学规律作了定性和定量两个方面的分析。

Analysis of Slender Bodies of Revolution with an Angle of Attack in Extreme Ground Effect

A slender body of revolution with an angle of attack is analysed for motion with constant forward velocity, in very close proximity to a plane wall, by using the method of matched asymptotic expansions. The analytic asymptotic solution of the flow induced is given. The attractive force and pitching moment acting on the body are obtained in terms of the integrals over the body length. The kinematic and dynamic characters of the extreme ground effect on the slender body are analysed.