On the Double-vacuurn Phenomenon of a Supersonic Air Ejector

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The double-vacuum phenomenon of a supersonic air ejector having a mixing tube with throat, which appears as a hysteresis on a performance curve, is experimentally investigated under the condition of a constant primary mass flow with the secondary one increased. It is shown that the phenomenon occurs when the induced secondary mass flow increases and a mixed flow of the primary and secondary flows is choked at the ejector throat. Owing to the choking at the ejector throat, as well as a shock wave which is generated by the choking of the flow at the throat of the primary nozzle, another shock wave appears in the section downstream of the ejector throat. The behaviors of these two shock waves are optically observed by a schlieren method, and numerically calculated under the assumption of a one-dimensional steady flow, and it is shown that the calculated results agree qualitatively with the experimental ones.
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