二元外压式进气道斜板和唇口参数选择的风洞试验研究

EXPERIMENTAL INVESTIGATION ON SELECTING RAMP AND LIP PARAMETERS OF TWO-DIMENSIONAL EXTERNAL COMPRESSION INLET

关键词:  风洞试验  外压式进气道  设计参数  进气道气流  实验空气动力学

Key words:  Wind tunnel test  External compression inlet  Design parameter  Inlet flow  Experimental aerodynamics

摘要:

在几何不可调的二元外压式斜极进气道的设计中，选择合理的斜板和唇口几何参数是最重要的问题之一。本文对一个设计马赫数为１．８的这类进气道的斜板和唇口参数进行了风洞、试验研究。用缩尺模型风洞试验，对比分析了不同斜板角和不同外侧唇口内唇角、唇缘半径对进气道内流特性的影响。结果表明，对确定的进气道布局，斜板角小的变化对进气道超音速内流总医恢复系数、稳态出口流场周向畸变指数及喘振裕度的影响很大，唇口参数小的改变却对亚音速内流特性并无所期待的明显影响，而对超音速的影响仍是大的。

Abstract:

A 1/11-scale model of a two-dimensional external compression supersonic inlet with maximum Mach number 1. 8 was tested from Mach 0. 8 to 1. 8. Theramp of the inlet is side-mounted vertically, its duct is bifurcated. The effects oframp angles, internal lip angles and circle lip radius on internal performances of theinlet are presented. The experimental results show that a small change of ramp angle causes large changes of inlet pressure recovery, circumferential steady-pressuredistortion and buzz margin, and small changes of internal lip angle and lip radius effect the changes in performances of inlet unobviously at subsonic, but apparently atsupersonic.