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Thermophysics and Aeromechanics

2007 year, number 2

Improvement of gas-jet ejector discharge characteristics with heads, chevrons, and tubs

A.V. Sobolev1, V.I. Zapryagaev1, and V.M. Mal’kov2
1Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
Pages: 193–200


Properties of gas-jet ejectors with converging mixing chamber operated under critical and subcritical flow conditions are examined. Establishment of the critical operation mode in such ejectors started up with and without the secondary gas flow is considered. The mechanism underlying the emergence of flow pulsations at low rates of the low-head flow is described. Results of an experimental study aimed at the improvement of ejector discharge characteristics by chamber-length reduction and related mixing enhancement are reported. As flow-mixing elements, slotted heads, chevrons, and tubs are considered. The best discharge characteristics were obtained with nozzles provided with tubs.