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Titolo:
Supersonic jet noise control via trailing edge modifications
Autore:
Kim, JH; Lee, S;
Indirizzi:
Inha Univ, Dept Mech Engn, Inchon 402751, South Korea Inha Univ Inchon South Korea 402751 ech Engn, Inchon 402751, South Korea
Titolo Testata:
KSME INTERNATIONAL JOURNAL
fascicolo: 8, volume: 15, anno: 2001,
pagine: 1174 - 1180
SICI:
1226-4865(200108)15:8<1174:SJNCVT>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
MIXING ENHANCEMENT; AXISYMMETRICAL JET; RECTANGULAR JETS; FLOW;
Keywords:
Noise Control; Supersonic Jet; Screech Tone; Broadband Shock associated Noise; Trailing edge modification;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
11
Recensione:
Indirizzi per estratti:
Indirizzo: Kim, JH Inha Univ, Dept Mech Engn, Inchon 402751, South Korea Inha Univ Inchon South Korea 402751 , Inchon 402751, South Korea
Citazione:
J.H. Kim e S. Lee, "Supersonic jet noise control via trailing edge modifications", KSME INT J, 15(8), 2001, pp. 1174-1180

Abstract

Various experimental data, including mixing areas, cross correlation factors, surface flow patterns on nozzle walls, and far field noise spectra, wasused to draw a noise control mechanism in a supersonic jet. In the underexpanded case, mixing of the jet air with ambient air was significantly enhanced as presented before, and mixing noise was also dramatically reduced. Screech tones, in the overexpanded case, were effectively suppressed by trailing edge modifications, although mixing enhancement was not noticeable. From mixing and noise performance of nozzles with modified trailing edges, enhancing mixing through streamwise vortices seems an effective way to reduce mixing noise in the underexpanded flow regime. However, screech tones in the overexpanded flow regime is well controlled or suppressed by making shockcells and/or spanwise large scale structures irregular and/or less organized by a proper selection of trailing edges. The noise field in the overexpanded flow regime was greatly affected by the symmetricity of the nozzle exit geometry. In the underexpanded flow regime, the effects of the symmetricity of the nozzle exit on mixing were negligible.

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Documento generato il 04/04/20 alle ore 08:40:15