Acoustic properties associated with nozzle lip thickness in screeching jets

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Imperfectly expanded supersonic jets generate discrete frequency sound known as screech tones. In the low supersonic Mach number, the screech phenomenon is axisymmetric. In this study the effect of nozzle lip thickness on the axisymmetric jet screech is investigated both by screech scattering computation and screeching jet simulation. The conservative form of the axisymmetric Euler equations in generalized coordinates are used to simulate a scattering problem and the Reynolds-Averaged Navier-Stokes equations with the modified Spalart-Allmaras turbulence model is employed for screeching jet simulation. Numerical results of scattered directivity pattern in scattering computation will be reported. Influence of the nozzle lip thickness on the momentum thickness, shock-cell spacing and screech tone wavelength is examined.
Publisher
KOREAN SOC MECHANICAL ENGINEERS
Issue Date
2007-05
Language
English
Article Type
Article
Keywords

SUPERSONIC JETS; TONES; NOISE

Citation

JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY, v.21, no.5, pp.764 - 771

ISSN
1738-494X
DOI
10.1007/BF02916354
URI
http://hdl.handle.net/10203/7091
Appears in Collection
AE-Journal Papers(저널논문)
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