扰流片诱导的可压缩非定常流场数值模拟

NUMERICAL SIMULATION OF THE COMPRESSIBLE UNSTEADY FLOW INDUCED BY AN OSCILLATING SPOILER

振动扰流片非定常分离流动直接与通过外部激发对剪切流场进行控制的问题有关.例如,可用扰流片产生的非定常分离涡改变飞行器大攻角下背风面产生的分离、旋涡破裂、以及各种非定常现象,以改变飞行器的飞行特性和操纵性能.达到高升力和机动飞行的目的.因此,对于扰流片非定常分离涡的机理研究引起了人们广泛的兴趣.

The compressible constrained unsteady flow induced by an oscillating spoiler is simulatedwith solving the N-S equations. The process of forming, growing, shedding and merging ofthe vortex behind the spoiler is obtained, and the pressure? variation with time is also presented.Meanwhile, the effect of the spoiler oscillating frequency and the compressibility on vortex move-ment are discussed. The results can be used to analyse the characters of the spoiler flow fieldand to further realize the vortex control on an a irfoil surface.