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Effect of cut-outs on underexpanded rectangular jets

Published online by Cambridge University Press:  04 July 2016

S. Elangovan  and
E. Rathakrishnan
S. Elangovan
Affiliation:
Department of Mechanical Engineering, Gurunanak Dev Engineering College, Bidar, Karnataka, India
E. Rathakrishnan
Affiliation:
Department of Aerospace Engineering, Indian Institute of Technology, Kanpur, India
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Abstract

The flowfield characteristics of jets from plain and rectangular orifices with semi-circular cut-outs have been experimentally investigated for both sonic and underexpanded conditions. Detailed pitot pressure measurements revealed that the cut-outs had a strong influence on the emerging flowfield. The rectangular orifice with cut-outs at the minor axis ends showed more effective mixing with shorter core lengths and faster near field jet decay when compared with the plain rectangular and the rectangular orifice with cut-outs at the major axis ends. The general trend of variation of shock cell length with fully expanded Mach number was consistent with Tam's theory, but the shock cell length of orifice jets were less than that predicted by Tam.

Type
Research Article
Information
The Aeronautical Journal , Volume 102 , Issue 1015 , May 1998 , pp. 267 - 276
Copyright
Copyright © Royal Aeronautical Society 1998 

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