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http://dx.doi.org/10.6108/KSPE.2012.16.1.055

RANS-LES Simulations of Scalar Mixing in Recessed Coaxial Injectors  

Park, Tae-Seon (경북대학교 기계공학부)
Publication Information
Journal of the Korean Society of Propulsion Engineers / v.16, no.1, 2012 , pp. 55-63 More about this Journal
Abstract
The turbulent flow characteristics in a coaxial injector were investigated by the nonlinear $k-{\varepsilon}-f_{\mu}$ model of Park et al.[1] and large eddy simulation (LES). In order to analyze the geometric effects on the scalar mixing for nonreacting variable-density flows, several recessed lengths and momentum flux ratios are selected at a constant Reynolds number. The nonlinear $k-{\varepsilon}-f_{\mu}$�� model proposed the meaningful characteristics for various momentum flux ratios and recess lengths. The LES results showed the changes of small-scale structures by the recess. When the inner jet was recessed, the development of turbulent kinetic energy became faster than that of non-recessed case. Also, the mixing characteristics were mainly influenced by the variation of shear rates, but the local mixing was changed by the adoption of recess.
Keywords
Liquid Rocket Engine; Coaxial Injector; Large Eddy Simulation; Recess; Scalar Mixing;
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