Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/44325
Title: Skewness as means for separating crackle from screech
Authors: Punekar, Jyothi
Avital, Eldad J.
Rona, Aldo
First Published: 18-May-2019
Presented at: 2019 AIAA/CEAS Aeroacoustics Conference, TUDelft, Netherlands
Start Date: 20-May-2019
End Date: 23-May-2019
Publisher: American Institute of Aeronautics and Astronautics
Citation: 2019 AIAA/CEAS Aeroacoustics Conference, 2019, pp. 1-12
Abstract: Screech and crackle are investigated by far-field acoustic measurements and visualizations of a cold jet fromaMach 2 convergent-divergent nozzle operated over-expanded, fully expanded, and under-expanded. The skewness of the sampled far-field pressure frequency distribution is evaluated at polar angles below 90°. It is found that skewness alone is insufficient for singling out crackling noise, however, a better characterization is obtained by jointly considering the skewness of the acoustic pressure time derivative. New evidence is provided of crackle and screech being competitive mechanisms over the nozzle pressure ratio range 4:3 to 10. These new physical insights advance the current understanding of high-speed jet aeroacoustics, towards enabling sustainable airport operations of supersonic civil aircraft.
DOI Link: 10.2514/6.2019-2521
ISBN: 978-1-62410-588-3
Links: https://arc.aiaa.org/doi/10.2514/6.2019-2521
http://hdl.handle.net/2381/44325
Version: Post-print
Status: Peer-reviewed
Type: Conference Paper
Rights: Copyright © 2019, American Institute of Aeronautics and Astronautics. Deposited with reference to the publisher’s open access archiving policy. (http://www.rioxx.net/licenses/all-rights-reserved)
Appears in Collections:Conference Papers & Presentations, Dept. of Engineering

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