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NUMERICAL STUDY ON THE FREQUENCY CHARACTERISTICS OF SCREECH TONE IN A SUPERSONIC JET  

Kim, Yong-Seok (순천대학교 기계우주항공공학부)
Ryu, Ki-Wahn (전북대학교 기계항공시스템공학부)
Hwang, Chang-Jeon (한국항공우주연구원)
Lee, Duck-Joo (한국과학기술원 항공우주공학)
Publication Information
Journal of computational fluids engineering / v.12, no.1, 2007 , pp. 53-59 More about this Journal
Abstract
An axisymmetric supersonic screeching jet is numerically simulated to examine the length scales of screech frequency as well as screech tone generation mechanism. The axisymmetric Reynolds-averaged Navier-Stokes equations in conjuction with a modified Spalart-Allmaras turbulence model are employed. It is demonstrated that the axisymmetric jet screech tones can be simulated correctly and the numerical results are in good agreement with the experimental data. Instability waves, shock-cell structures and the phenomena of shock motion are investigated in detail to identify the screech tone generation mechanism. Shock spacings and standing wave length are analyzed to determine the dominent length scale crucial to the screech frequency formulation.
Keywords
Supersonic Jet; Screech Frequency; Shock-cell Spacing; Standing Wave; High-order ENO scheme;
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