Experimental investigation on parameter matching of high compression-ratio two-stage gas ejector system

A single-module two-stage ejector test facility was established to investigate the supersonic ejector performance, and hot gases with various were used as parameters first-stage and second-stage driving fluids. The investigation indicates that there is a lower limit of flux when second-stage ejector start alone, and the parameter matching range is relatively wide for the system itself, but the parameter matching range will reduce greatly for the system with load. Pressure matching is a all-important question for multi-stage ejector.