一个计算喷气翼的考虑非线性效应的涡格法

 本文发展了确定喷气翼气动性能的三维非线性方法。用附着涡和自由涡系统代表翼面、喷流、尾流和翼尖涡,解出弦向和展向载荷分布;同时解出喷流、尾流和翼尖涡的形状。所得结果在大展弦比条件下与实验及其他理论结果相符。本法可应用于各种展弦比、喷流角以及部分喷气情况下。

A VORTEX LATTICE METHOD FOR JET WING PERFORMANCE WITH NONLINEAR WAKE AND TIP FLOW

A three-dimensional nonlinear method for determining the aerodynamic performance of a jet flap wing has been developed. The method utilizes a system of bound and free vortices with vortex lattices to represent the wing, jetwake and tip vortices. The kinematic boundary conditions are satisfied at the wing, as the ordinary vortex lattice theory states. But the feature of the present method lies in satisfaction of both kinematic and dynamic conditions and consideration of vortex interaction. The solutions obtained include chordwise and spanwise load distributions, from which sectional and total aerodynamic quantities are derived. In the solution the jet-wake sheet and the tip vortex shape are determined simultaneously with the nonlinear effects taken into account. The solutions obtained by the present method agree well with other analytical results and available data for a jet wing with large aspect ratio. The present method has no limitation on the aspect ratio and is applicable to the cases with large jet blowing angles as well. The partial span jet blowing and the disturbance of main wing blowing to the second wing are also treated in this ptaper.