Profile Optimization Design And Experimental Study Of Supersonic Ejector

Supersonic ejector is a device using high energy primary flows extract secondaryflows with low energy. It has broad application prospect in the ground test ofhypersonic air-breathing propulsion system, rocket engine altitude test vacuum systemand chemical laser pressure recovery system etc.The paper demonstrated a method ofsupersonic ejector profiles optimization design and researches in the optimization ofsupersonic ejector by theoretical analysis, numerical simulations and experimentalstudies.The content involved the introduction of supersonic ejector machine flow fieldanalysis model, the optimization design method, numerical simulation and experimentalresearch verified the profile optimization of the supersonic ejector in the aspect ofimproving the boost performance.The results demonstrated low ejector coefficient, optimizing supersonic ejectorscheme with high Mach number of primary flow and suitable Mach number ofsecondary flow should be adopted to realize high pressure ratio and better efficiency ofsupersonic ejector design. The ratio of cross section and pressure performance of thesupersonic ejector model could be better, the startup pressure became lower and ejectorpressure ratio would be higher in the same parameters of primary and secondary flow.In the traditional supersonic ejector, the boost performance of the constant pressurehybrid supersonic ejector was better than the constant cross-section hybrid supersonicejector. While the performance of supersonic ejector with profiles optimization wasbetter than constant pressure hybrid supersonic ejector. Moreover, the lower of theejector coefficient brought about higher Mach number of the primary flow and greaterperformance difference between them.Some conclusions were achieved in this study, and it supports certain referencevalues for theory and mechanism studies of supersonic ejector apparatus design.