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Titolo:
Numerical study of shock-reflection hysteresis in an underexpanded jet
Autore:
Gribben, BJ; Badcock, KJ; Richards, BE;
Indirizzi:
Univ Glasgow, Dept Aerosp Engn, Glasgow G12 8QQ, Lanark, Scotland Univ Glasgow Glasgow Lanark Scotland G12 8QQ ow G12 8QQ, Lanark, Scotland
Titolo Testata:
AIAA JOURNAL
fascicolo: 2, volume: 38, anno: 2000,
pagine: 275 - 283
SICI:
0001-1452(200002)38:2<275:NSOSHI>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
STEADY FLOWS; WAVE REFLECTIONS; RECONSIDERATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
22
Recensione:
Indirizzi per estratti:
Indirizzo: Gribben, BJ Univ Glasgow, Dept Aerosp Engn, Glasgow G12 8QQ, Lanark, Scotland Univ Glasgow Glasgow Lanark Scotland G12 8QQ Lanark, Scotland
Citazione:
B.J. Gribben et al., "Numerical study of shock-reflection hysteresis in an underexpanded jet", AIAA J, 38(2), 2000, pp. 275-283

Abstract

Shock-reflection hysteresis and plume structure in a low-density, axisymmetric highly underexpanded air jet is examined using a Navier-Stokes dow solver. This type of jet is found in a number of applications, e.g., rocket exhausts and fuel injectors. The plume structure is complex, involving the interaction of several flow features, making this a demanding problem. Two types of shock reflection appear to occur in the plume, regular and Mach, depending on the jet pressure ratio. The existence of a dual solution domain where either type may occur has been predicted, in agreement with experimentwhere the same phenomenon has been observed for a nitrogen jet. There is ahysteresis in the shock-reflection type; the reflection type observed in the dual-solution domain depends on the time history of the plume development. A quasi-steady approach is employed to calculate the entire hysteresis loop. An implicit, multiblock structured, finite volume flow solver is used. The results of the computational study are used to examine the structure of the plume and are compared with experimental data where possible. Some flow features not initially recognized from experiment have been identified, notably curvature of the Mach disk, recirculation behind the Mach disk, andthe regular reflection having Mach-reflection characteristics.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/11/20 alle ore 21:32:45