高超进气道临界起动特征

通过对一种吸气式高超飞行器模型的Ma=7风洞吹风试验结果的分析,获得了高超进气道不起动、临界起动和起动状态的流动特征,包括流动图谱、压力分布和气动力分布;并将进气道内收缩比值与等熵理论最大起动收缩比限、自起动最大起动收缩比限和经验最大起动收缩比限做了对比分析,分析结果有助于高超进气道的设计和起动性能的评估.

Critical starting characteristics of hypersonic inlets

An airbreathing hypersonic vehicle model was tested in the Ma=7 wind tunnel.The experimental investigations yielded schlieren pictures of the inlet flow,static surface pressure measurements along inlet/internal flowpath and aerodynamic force distributions.The flow field characteristics were achieved,such as: unstarting hypersonic inlet,critical starting and starting condition.The ability of isentropic limit,Kantrowitz limit and Van Wie limit to predict the starting contraction ratio was assessed,showing that the isentropic limit and Van Wie limit could not estimate the allowable starting and maximum contraction ratio.The Kantrowitz limit is slightly conservative.The above results are helpful to the design of the hypersonic inlet and the assessment of starting performance.