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Studies on high speed jets from nozzleswith internal grooves

Published online by Cambridge University Press:  03 February 2016

S. Elangovan  and
E. Rathakrishnan
S. Elangovan
Affiliation:
Department of Aerospace Engineering, Indian Institute of Technology, Kanpur, India
E. Rathakrishnan
Affiliation:
Department of Aerospace Engineering, Indian Institute of Technology, Kanpur, India
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Abstract

Experiments were carried out on jets issuing fromcircular nozzles with grooved exits and the resultscompared with those of the plain nozzle. The plainnozzle had an exit diameter of 10mm. Because of theintroduction of semi-circular grooves at the exit,the effective or equivalent diameter of the groovednozzles was 10·44mm. The groove lengths were variedas 3, 5 and 8mm. The nozzles were operated at fullyexpanded sonic and underexpanded exit conditions.The corresponding fully expanded Mach numbers were1·0 and 1·41. The shock cell structure of theunderexpanded jets from grooved nozzles appeared tobe weaker than that of the plain nozzle, asindicated by lesser amplitudes of the cyclicvariation of the Pitot pressure. The iso-Machcontours indicate that the jet spread along thegrooved plane is significantly higher than thatalong the ungrooved plane. Off-centre peaks wereobserved in the mean pressure profile ofunderexpanded jets from grooved nozzles. They wereprobably due to the streamwise vortices shed fromthe grooves.

Information

Type
Research Article
Information
The Aeronautical Journal , Volume 108 , Issue 1079 , January 2004 , pp. 43 - 50
Copyright
Copyright © Royal Aeronautical Society 2004 

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