变唇口型总压畸变流场的模拟技术

TECHNIQUE OF VARYING-LIP SIMULATING TOTAL PRESSURE DISTORTED FLOW FIELD

本文对变唇口型总压畸变流场模拟技术进行了试验研究。一方面总结分析了各种唇口几何参数对总压分布谱图和总压脉动紊流度的影响 ,从而将这些一般的规律应用于特定总压分布谱图 ,总压脉动紊流度及其畸变指数的模拟。另一方面 ,对给定的二个不同类型的总压畸变流场进行模拟 ,所模拟的稳态周向总压畸变指数 ,平均总压脉动紊流度和最大瞬时畸变指数均能达到规定偏差的要求。并从这些特定流场模拟中 。

A technique of vaying lip simulating total pressure distorted flow field has been investigated experimentally.The effects of the various geometric parameters of the lip on the total pressure distribution and the turbulence of the total pressure fluctuation are analysed,some rules have been obatined.The relations of the total pressure recovery and the mean turbulence to the mean Mach number for the axisymmetrical lip of various shapes are also presented.Therefrom the approach and the concept for simulating the real total pressure distorted flow field are deduced.Moreover,two kinds of the real total pressure distorted flow fields are simulated.As a result,the simulated total pressure distortion index DC 60 ,the mean turbulenceuand the maximum instantaneous distortion indexes (K θmax or K rmax ) meet the requirements of tolerances and some general experience is obtained from the simulation of the specific flow fields.The results show that it is a effective and inexpensive simulative technique to select an axisymmetrical lip shape as a primary lip according to the mean Mach number,the mean turbulence and the total pressure distribution of the given total pressure distorted flow field.