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The Coanda effect in gas-dynamic noise control. [pressure reduction by silencers]
Offline Availability: Go to Request Form
Author and Affiliation:
Vasilescu, G.(Kanner (Leo) Associates, Redwood City, CA, United States)
Abstract: The principle types of silencers are discussed for gas dynamic noise of free steam and gas expansions, as well as the results of research in gas dynamics of jets and applied acoustics. Gas dynamic noise attenuation by means of the Coanda effect is due to fluid decompression in a Coanda ejector of the external type, where a structural change takes place in the acoustic frequency spectrum and in its direction, as well as a substantial decrease in the fluid's velocity, temperature and concentration. This process is continued in the second phase with absorption of the acoustic waves by means of an active structure.
Publication Date: Jun 01, 1974
Document ID:
19740020273
(Acquired Nov 22, 1995)
Accession Number: 74N28386
Subject Category: FLUID MECHANICS
Document Type: Conference Paper
Publication Information: The 4th Natl. Conf. on Acoustics, Vol. 1A (NASA-TT-F-15375); p 143-149
Publisher Information: United States
Financial Sponsor: NASA; United States
Organization Source: Kanner (Leo) Associates; Redwood City, CA, United States
Description: 7p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: ACOUSTIC DUCTS; COANDA EFFECT; GAS DYNAMICS; NOISE REDUCTION; SILENCERS; JET FLOW; NOISE POLLUTION; NOZZLE FLOW; PRESSURE REDUCTION; SOUND WAVES; STEAM FLOW
Imprint And Other Notes: In its The 4th Natl. Conf. on Acoustics, Vol. 1A (NASA-TT-F-15375) p 143-149 (SEE N74-28363 17-32). Transl. into ENGLISH from A 4-A Conferinta Nationala de Acustica. Vol. 1,A. Combaterea Zgomotului Si Vibratiilor, Bucharest, 29-31 May 1973 p 189-197
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