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实现高速气流的点火和稳定燃烧是超燃冲压发动机燃烧室设计面临的主要问题,空气节流通过在流场中产生激波串,减小主流气体的马赫数,提高当地的静温和静压,辅助发动机实现起动点火和稳定燃烧。为了研究空气节流的详细机理,通过求解三维N-S方程的方法研究了节流流量、节流位置对节流效果的影响,同时对比了有无节流存在对超燃冲压发动机燃烧室流场结构和掺混特性的影响,分析了节流促进燃料高效混合的机理。结果表明:在燃烧室入口马赫数2、静温517.7K、静压101342.2Pa的条件下,20%入口空气流量的节流流量是最合适的节流流量,本文研究的实例中最佳节流位置位于距燃烧室入口623mm处,同时证实了节流有效地促进了燃料的混合,提高了混合效率。
Achieving high-speed airflow ignition and stable combustion is the main problem confronting the combustion chamber design of scramjet. Air throttling can reduce the Mach number of the mainstream gas and increase local static temperature and static pressure by generating shock waves in the flow field, Assist the engine to start the ignition and stable combustion. In order to study the detailed mechanism of air throttling, the influence of throttle flow and throttling position on throttling effect was studied by solving three-dimensional Navier-Stokes equations. Simultaneously, And blending characteristics, the mechanism of throttling to promote efficient fuel mixing was analyzed. The results show that the throttle flow rate of 20% inlet air flow is the most appropriate throttling flow rate under the condition of Mach 2 inlet inlet, 517.7K static temperature and 101342.2Pa static pressure. The optimal throttling in this study The location is located 623 mm from the combustion chamber inlet, confirming that throttling effectively promotes fuel mixing and improves mixing efficiency.