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http://dx.doi.org/10.5139/JKSAS.2010.38.8.790

Numerical Investigation on the Mechanism of Mode Transition in Axi-symmetric Supersonic Jet Screech  

Bin, Jong-Hoon (Florida State University)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.38, no.8, 2010 , pp. 790-797 More about this Journal
Abstract
Mode transition of the axi-symmetric screech tone in the low supersonic Mach number range from 1.0 to 1.20 is numerically analyzed. The axi-symmetric Navier-Stokes equations and the k-e turbulence model are solved in the cylindrical coordinate system. The dispersion-relation-preserving(DRP) scheme is applied for space discretization and the optimized four levels marching method are used for time integration. At low supersonic Mach numbers with an axi-symmetric A1 mode in the simulation, it is shown that acoustic propagation due to the nonlinear effects is seen in the lateral direction and the screech tone frequency is the same as the vortex passing frequency due to the generation of intense large-scale vortical motions.
Keywords
Screech tone; Acoustic feedback; Mode transition; Vortex passing frequency; Directivity; Dispersion-Relation-Preserving Scheme;
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