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超声速引射器在航天发动机、化学激光器等的地面试验所需压力恢复系统中有着重要的应用,采用超-超引射方式是优化压力恢复系统的性能和实现设备小型化的途径之一。为探索适用于超-超引射器的设计准则,对一种两级超声速引射器的超-超引射流动现象开展了研究,试验发现该构型引射器在特定压力匹配范围内即可实现一、二级主流间的超-超引射又可以实现主流对二次流的超-超引射,结合数值仿真对流场结构和参数的分析表明超-超引射的形成机制可归结为压力匹配问题,通过提高来流总压与混合室匹配静压的压比可建立超-超引射;混合室匹配静压由引射气流主导;提高二次流总压或降低主流压力均可提高二次流马赫数,该规律对建立超-超引射、提高引射效率有指导意义。
Supersonic ejectors have important applications in pressure recovery systems for ground tests such as aerospace engines and chemical lasers. The use of super-super-injection is one of the ways to optimize the performance of pressure recovery systems and miniaturize equipment. In order to explore the design criteria applicable to the super-ejector, the super-super-ejector flow phenomenon of a two-stage supersonic ejector has been studied. It is found that the ejector of this configuration has a good performance in the specific pressure matching range The results show that the super-super-primary and secondary main-stream super-super-jet can achieve the mainstream of the secondary flow, combined with numerical simulation of the flow field structure and parameters of the super-super-injection mechanism can be formed Attributed to the problem of pressure matching, super-super-injection can be established by increasing the pressure ratio between the total pressure in the incoming flow and the static pressure in the mixing chamber. The matching static pressure in the mixing chamber is dominated by the induced flow. The total pressure of the secondary flow is increased or the pressure in the mainstream is reduced Can improve the second-order flow Mach number, which has guiding significance for establishing super-super-shooting and improving shooting efficiency.