Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/115456
Title: Mixing characteristics of elliptical jets with plug
Authors: Debiasi, M. 
Herberg, M.R. 
Tsai, H.M. 
Papamoschou, D.
Issue Date: 2008
Source: Debiasi, M.,Herberg, M.R.,Tsai, H.M.,Papamoschou, D. (2008). Mixing characteristics of elliptical jets with plug. 46th AIAA Aerospace Sciences Meeting and Exhibit : -. ScholarBank@NUS Repository.
Abstract: It is known that elliptical jets entrain surrounding air more effectively than round jets. Past studies also show that convergent-divergent nozzles operated at overexpanded conditions create flow instabilities that enhance the jet mixing. A convergent-divergent passage can be created between an elliptical nozzle and a round plug. The exit-to-throat height of the annular passage is non uniform around the nozzle. The aim of the present study is to investigate the characteristics of this arrangement which is expected to produce vigorous mixing. The mean velocity fields of subsonic-speed jets from such nozzle configuration were surveyed using an array of Pitot probes. Comparisons were made between jets using elliptical nozzles with plug at various pressure and exit-to-throat area ratios and jets from round, convergent nozzles with plug. The results indicate that elliptical nozzles with plug split the flow in two cores. This increases the mixing and promotes faster velocity decay in the plume. The flow instabilities associated to overexpanded conditions in the nozzle also contribute to enhance the mixing. Copyright © 2008 by Temasek Laboratories - National University of Singapore.
Source Title: 46th AIAA Aerospace Sciences Meeting and Exhibit
URI: http://scholarbank.nus.edu.sg/handle/10635/115456
ISBN: 9781563479373
Appears in Collections:Staff Publications

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