底部流动脉动压强特性研究

A Study of Fluctuating Pressure Features on Base Flow

利用脉动压力测量技术，研究细长旋成体底部流动非定常特性，实验M数0．6～3．5。实验中对不同后体构型（圆柱后体和圆锥后体）模型进行测量，通过对测得的功率谱密度曲线、脉动压强均方根值以及相关函数等结果的分析比较，探讨底部流动非定常特性的某些规律以及模型外形等因素的影响。

An investigation of unsteady base flow characteristics on a slender revolution body were carried out with fluctuating pressure measurements in the wind tunnel. The free stream Mach number was from 0.6to 3.5 in the test section. Both models with cylindrical and conical afterbody were used. The fluctuating pressure was measured and data reduction presented power spectrum density distribution and RMS of fluctuating pressure corresponding to various Mach number, otherwise the auto-correlations and cross-correlations characteristics were given. It shows some unsteady flow features and the effect of the geometrical configurations of the afterbodies on dase flow.