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对不同内收缩段设计的高超声道流场进行了数值仿真研究,考查了下壁面水平倾角对进气道各性能参数特别是再起动特性的影响。结果表明,减小进气道不起动流场大规模分离区尾部所在下壁面的水平倾角,可以显著提高不起动流场的性能,大幅降低再起动马赫数,但也带来内收缩段长度增加,起动流场性能降低的缺点。为兼顾两者性能,提出了一种新的内收缩段下壁面设计方案,该设计前段采用凹面收缩段,后段接以水平倾角更小的平直段。与原型相比,新设计的长度不变,起动流场的性能波动较小;而再起动马赫数则由9.4降为8,再起动特性改善效果明显。
The numerical simulation study on the hyperonic channel flow field of different internal contraction sections was carried out. The influence of the horizontal inclination of the lower wall on the performance parameters of the intake port, especially the restart characteristics was investigated. The results show that reducing the horizontal inclination of the lower wall where the tail of mass flow in non-priming flow field is located can significantly improve the performance of the non-priming flow field and significantly reduce the restart Mach number but also increase the length of the internal contraction , Start-up flow field to reduce the shortcomings. In order to balance the performance of the two, a new design scheme of the inner wall of the inner shrinking section is proposed. The front section of the design adopts the concave section and the rear section is connected with the straight section with smaller horizontal inclination. Compared with the prototype, the length of the new design is unchanged, the performance of the starting flow field is less fluctuated; while the restarting Mach number is reduced from 9.4 to 8, and the restarting characteristic is improved obviously.