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Record Details

Record 10 of 39377
On the tones of round choked jets impinging on normal flat plates
Author and Affiliation:
Powell, Alan(Houston Univ., TX, United States)
Henderson, Brenda(Houston, University, TX, United States)
Abstract: An experimental investigation of the sound produced by an axisymmetric supersonic jet impinging on plates with variable size and nozzle-to-plate spacings was performed. Spectral analysis and schlieren photography were used to determine the sound characteristics and flow disturbances associated with the production of discrete tones. Two classes of tones, associated with small and large plates, existed for pressure ratios above 2.70. For lower pressure ratios, however, only large plate tones occurred for all plate sizes with choked jet screech appearing at the largest spacings. Reflector tests indicated that both classes of tones were part of a feedback loop to the nozzle. Schlieren photography revealed both symmetric and asymmetric disturbances in the large plate jet flows which corresponded to symmetrical and helical modes of oscillation in the cross-spectrum studies. In addition to this, both symmetric and asymmetric oscillations of the shock waves occurred in the large plate case while symmetric oscillations of the shock wave occurred in the small plate case.
Publication Date: Oct 01, 1990
Document ID:
19910027875
(Acquired Nov 28, 1995)
Accession Number: 91A12498
Subject Category: ACOUSTICS
Report/Patent Number: AIAA PAPER 90-3985
Document Type: Preprint
Publisher Information: United States
Contract/Grant/Task Num: NGT-50415
Financial Sponsor: NASA; United States
Organization Source: Houston Univ.; TX, United States
Description: 10p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: AEROACOUSTICS; FLAT PLATES; JET IMPINGEMENT; NOISE GENERATORS; SHOCK WAVES; SUPERSONIC JET FLOW; LOW FREQUENCIES; NOZZLE GEOMETRY; SCHLIEREN PHOTOGRAPHY; SPECTRUM ANALYSIS
Imprint And Other Notes: AIAA, Aeroacoustics Conference, 13th, Tallahassee, FL, Oct. 22-24, 1990. 10 p. Research supported by the Texas Advanced Research Program and University of Houston.
Availability Source: Other Sources
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