超音速环形引射器空气引射启动特性试验

Experimental Investigation on the Start Performances of the Supersonic Annular Air Ejector

建立了超音速环形引射系统,对环形引射器空气引射启动特性进行了试验研究。试验结果表明:管道马赫数越大,则系统启动压强越高,同时盲腔真空度越高;混合室收缩比越小,系统启动压强越低;若管道马赫数较大,而第二喉部长径比和亚音速扩压段面积比过小,引射器启动过程可能不稳定,甚至无法启动;混合室收缩比、环型引射器扩压管道参数对盲腔压强无影响。

The air ejector test facility was established to investigate the start performance of supersonic annular ejector. The investigation ind/cates that the higher the roach number in pipe, the higher start pressure and vacuum in cavity, and that the mixing-room contraction ratio and the pipe configuration of the system deeply influence the start performance, but they have little influence on the vacuum in cavity.