Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/155770
Title: Near- and far-field acoustic measurements for stepped nozzles at over- and perfectly-expanded supersonic jet flow conditions
Authors: Wei, X. F.
Chua, Leok Poh
Lu, Zibao
Lim, Desmond Haoxiang
Mariani, Raffaello
Cui, Yi Dan
New, Tze How
Keywords: Engineering::Mechanical engineering
Issue Date: 2020
Source: Wei, X. F., Chua, L. P., Lu, Z., Lim, D. H., Mariani, R., Cui, Y. D. & New, T. H. (2020). Near- and far-field acoustic measurements for stepped nozzles at over- and perfectly-expanded supersonic jet flow conditions. Journal of Fluids Engineering, 142(11), 111205-. https://dx.doi.org/10.1115/1.4047802
Project: MOE2014-T2-1-002 
10.13039/ 501100001475 
Journal: Journal of Fluids Engineering 
Abstract: Detailed near- and far-field acoustic measurements were conducted for two circular stepped nozzles with 30 deg and 60 deg design inclinations at over- and perfectly-expanded supersonic jet flow conditions and compared to those for a circular nonstepped nozzle. Far-field acoustic results show that stepped nozzles play an insignificant role in altering noise emissions at perfectly expanded condition. At an over-expanded condition, however, the longer stepped nozzle produces significant noise reductions at the sideline and upstream quadrants, while the shorter stepped nozzle does not. Noise spectra analysis and Schlieren visualizations show that noise reduction can be primarily attributed to mitigations in the broadband shock-associated noise (BSAN), due to the ability of the longer stepped nozzle in suppressing shock strengths at downstream region. Near-field acoustic measurements reveal that the source region, as well as the intensity of turbulent and shock noises, are highly sensitive to the stepped nozzle configuration. Furthermore, BSAN seems to be eliminated by the longer stepped nozzle in near-field region due to the shock structure modifications.
URI: https://hdl.handle.net/10356/155770
ISSN: 0098-2202
DOI: 10.1115/1.4047802
Schools: School of Mechanical and Aerospace Engineering 
Research Centres: Temasek Laboratories @ NTU 
Rights: © 2020 American Society of Mechanical Engineers. All rights reserved. This paper was published in Journal of Fluids Engineering and is made available with permission of American Society of Mechanical Engineers.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles
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