Mixing enhancement of a 2D supersonic mixing layer induced by inflow periodic temperature excitation
Large eddy simulations have been performed for a 2D supersonic mixing layer with enforcing periodic temperature perturbation in the in flow boundary layer. The calculation considers the effect on mixing of various parameters, including amplitude of the perturbation, frequency of the perturbation, convective Mach number, Reynolds number and position where perturbation enforced. The results show that Reynolds number has little in uence on mixing enhancement while others have great. Growth rate of the spanwise vortices increases as perturbation amplitude increases, but keeps almost unchanged when the amplitude is big enough. Scales of the vortices induced by various frequencies are quite different and optimal frequencies may exist for proper mixing. The excitation method would be less effective when the convective Mach number Mc is higher than 1.0. And more intense mixing effect can be obtained when the same perturbation is fixed on the lower static temperature in-flow side than the higher side.
supersonic mixing layer mixing enhancement excitation
M.B.Sun Z.G.Wang J.H.Liang
College of Aerospace and Material Engineering, National Univ.of Defense Technology, Changsha 410073, China
国际会议
The Fifth International Conference on Fluid Mechanics(第五届国际流体力学会议)
上海
英文
2007-08-15（万方平台首次上网日期，不代表论文的发表时间）