一种组合发动机变几何进气道流场特性研究
Study of flow characteristics for a variable geometry inlet on combined engine
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摘要: 对一种组合发动机变几何进气道各马赫数下不同几何形状的三维流场进行了数值模拟.研究了不同马赫数时进气道的流场特征及气动性能.结果表明:随着来流马赫数的减小,外压段的超声溢流不断增大,进气道的流量系数不断减小;第一道内压缩波及其反射点位置对组织管道内的流场有着非常重要的作用;当有反压作用时,会在扩张段内形成激波串,激波串的形状和位置与来流马赫数、反压大小及管道内的流动有关.研究结果对类似进气道的几何调节方式有一定的指导意义.Abstract: The 3-D flow fields in a variable geometry inlet on combined engine at different Mach numbers were numerically analyzed.The characteristics of the inlet flow at different Mach numbers were compared and discussed.The results show that the spillage increases and the mass flow ratio decreases with the decline of the Mach number.The first internal shock and its reflective position are important to organize the flow field in the internal passage.With backpressure at the exit of the inlet,the shock train could be formed in the diffuser.The free stream Mach number,backpressure and flow condition in the internal passage determine the form and position of the shock train.The conclusions may be useful to the research for variable geometry inlet on combined engine.
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