Acoustic properties associated with nozzle lip thickness in screeching jets |
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Authors: | Yongseok Kim Duck Joo Lee |
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Affiliation: | 1.School of Mechanical and Aerospace Engineering,Sunchon National University,Suncheon,Korea;2.Department of Aerospace Engineering,Korea Advanced Institute of Science and Technology,Korea |
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Abstract: | 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. |
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