Single-stage ejector with high compression ratio
A.V. Sobolev1, V.I. Zapryagaev1, and V.M. Mal’kov2
1Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
2Baltic State Technical University, St. Petersburg, Russia
Pages: 141-150
Abstract
In the present work, characteristics of a critical ejector with central primary-flow nozzle and convergent mixing chamber were examined. One-dimensional calculations show the influence of the secondary gas velocity on ejector parameters at an isobaric process of mixing in the chamber. An experimental ejector with a Mach 4.5 nozzle and a primary flow discharge pressure of p = 0.09 bar was found to start up at a pressure of 30 % in excess of the rated value. With design nozzle replaced with a geometrically similar smaller nozzle and with increased total pressure in the primary flow, the ejector starts up more readily and the ratio of mass rates of the flows increases. In experiments with an air ejector, a mass-rate ratio of 0.15 at a compression ratio of 10 was obtained.
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