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Pipe jet noise reduction using co-axial swirl pipe

Part of: Sustainable Aerospace

Published online by Cambridge University Press:  06 March 2017

P. Balakrishnan  and
K. Srinivasan
P. Balakrishnan*
Affiliation:
Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai - 600036, India
K. Srinivasan*
Affiliation:
Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai - 600036, India
*
balaaero50@gmail.com
ksri@iitm.ac.in
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Abstract

The present experimental work highlights the acoustic far field and flow field characteristics of confined co-axial swirling pipe jets. Co-axial confinements with six vanes at angles of 0°, 20° and 40° are considered here. Two pipe lengths of L/D=0.5 and 2 are studied. The Mach numbers studied range from 0.85 to 1.83. An increase in the pipe length causes suppression of the transonic tones in non-swirl pipe jets. Swirl reduces the low frequency noise components and increases the high-frequency components compared to non-swirl jet. The broadband shock associated noise is mitigated by the swirl pipe jets. However, the screech tone is completely eliminated by the swirl pipe jets. Further, swirl pipe jets radiate low levels of noise at all the emission angles compared to non-swirl pipe jets, for both the pipe length cases at supersonic Mach numbers. Increase in the pipe length enhances the shock associated noise and OASPL for the non-swirl pipe jet. Centreline pitot survey and schlieren visualisation show a reduction in core length, reduction in the number of shock cells, weakening/destruction of the shock cells by the swirl pipe jets compared to the non-swirl pipe jets.

Keywords

Confined co-axial swirl jetswirling pipe jetswirl flowsjet noise reduction
Type
Research Article
Information
The Aeronautical Journal , Volume 121 , Issue 1238 , April 2017 , pp. 488 - 514
Copyright
Copyright © Royal Aeronautical Society 2017 

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