二元流场强激波与紊流附面层干扰下的气流动态畸变控制实验研究

AN EXPERIMENTAL INVESTIGATION ON CONTROL OF FLOW DYNAMIC DISTORTIONS DOWNSTREAM UNDER STRONG SHOCK-BOUNDARY LAYER INTERACTION IN THE TWO-DIMENSIONAL FLOW FIELD

关键词:  流场畸变  激波干扰  频谱分析  进气道

Key words:  Flow distortion  Shock wave interaction  Spectrum analysis  Inlet

摘要:

本文在一定的附面层条件下,研究了二元收-扩通道内强激波 M_U.B.m为1.68～1.74下的激波与壁面紊流附面层干扰区内的气流动态畸变控制技术,包括抽气缝槽结构,缝槽位置等对干扰区下游动态畸变的影响,并对通道扩张段出口气流的紊流度分布剖面上典型站的总压信号作功率谱密度、概率密度和压力时间历程作了分析.实验的结果表明,通过对干扰区内激波诱导分离流抽吸,在抽气量为W_bT/W_m=2.8～3.5%下,可以很有效地改善干扰区下游气流的动态畸变.

Abstract:

The control technique of flow dynamic distortions due to strong shock with MU, B, m 1.68-1.74 turbulent boundary layer interaction in a two-dimensional convergent divergent duct are investigated under some conditions of the boundary layer, including the effects of bleed slot structures and the slot locations on flow dynamic distortion downstream of the interaction. In this paper the power spectral density and the probability density of the total pressure signals and the pressure-time history at several particular locations along the profiles of the flow turbulence distribution at the exit of the divergent section of duct also are analysed.The experimental results show that the flow dynamic distortion downstream of the interaction region can be efficiently improved by means of bleeding the shock-induced separate flow in the interaction region with bleed flowWbl/Wm =2.8-3.5%.