隔板对二元高马赫数进气道自起动性能的影响

Impact of Splitter on Self-Starting Ability of Two-Dimensional High Mach Number Inlets

前伸隔板能够大幅提升高马赫数进气道的自起动性能。为了进一步获得前伸隔板关键设计参数对二元高马赫数进气道自起动性能的影响机制,针对一种低外阻二元高马赫数进气道,利用数值仿真研究了不同相对位置和前缘上切角的隔板构型下进气道的自起动过程。结果表明:上子通道在起动之前维持超声速不起动流场结构并且率先实现起动,有利于整个进气道自起动性能的提升;在研究范围内,随着隔板相对位置的增加,进气道自起动马赫数先减小后增大,而在基准位置改变隔板前缘切线角度,进气道自起动马赫数则变化较小;使进气道具备优良自起动性能的隔板相对位置区间和隔板前缘上切角区间均较宽,对应的上子通道和下子通道内收缩比的比值落于0.797~1.043。

A splitter equipped at the entrance of the internal contraction duct can significantly improve the self-starting ability of high Mach number inlets.To further obtain the effects of the key design parameters of the splitter on the self-starting ability,the self-starting processes of a two-dimensional low-external-cowl-drag high Mach number inlet with a splitter of different relative locations and upside leading angles are studied numerically.Results show that:(1)The upside passage is in the supersonic unstarted mode before starting,and starts first,which are beneficial for the self-starting performance of the whole inlet.(2)Within the scope of study,with the increase of the relative position of the splitter,the self-starting Mach number decreases first and then increases,while the self-starting Mach number decreases slightly when the tangent angle of the leading edge of the splitter is changed at the reference position.(3)The design region of relative location and upside leading angle of the splitter for good inlet self-starting performance is relative wide,and the corresponding ratio between the internal contraction ratios of the upside and downside passages falls within the range of 0.797~1.043.