On Calculation of the First CRITICAL Mode of Supersonic Gas Ejector with Conical Mixing Chamber

It has been shown theoretically and experimentally in earlier publications that two different critical modes of operation can be implemented in supersonic gas ejectors with conical mixing chamber at the same ejection coefficient (the modes vary in a structure of the mixing chamber flow). The ejector efficiency for the first critical mode is experimentally obtained, which is considerably higher than the ejector efficiency for the second critical mode. Design model and methods for calculation of ejection coefficient for the first critical mode of ejector operation are given which allow the maximal possible value of the ejection coefficient to be determined at the point of transition from the first critical mode to the second one. Satisfactory agreement between results of calculations and experiment is obtained.

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