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中文核心期刊

表面台阶引起的高超声速湍流边界层分离

STEP INDUCED HYPERSONIC TURBULENT BOUNDARY-LAYER SEPARATION

  • 摘要: 介绍了圆柱、方柱和二维台阶前干扰热流分布及油流和液晶热图的实验结果。来流马赫数M_1=5—9,雷诺数Re=(2—5)×10 ̄7/m,台阶高度与边界层厚度比h/δ=0.06— 2.5.实验发现干扰压力和热流高峰值出现在台阶前0.15倍台阶高度处的再附点附近,方柱台阶前压力和热流最高峰值不在中心线上,而在两侧角之内0.5倍台阶高度处附近,结果还表明干扰区几何特征参数,如分离距离、热流峰值和谷值点位置,与马赫数、雷诺数和台阶展宽无关,只随台阶高度线性增加。

     

    Abstract: This report describes detailed heating distribution data and the study of oilflow and liquid crystal thermograph in turbulent separated regions induced by cylindrical,square and two-dimensional steps in an impusle wind tunnel at Mach number range of 5-9,Reynolds number(2-5)×10 ̄7/m,Step heights ranged from 0.06-2.5 times boundarylayer thickness. The results indicate that surface pressure and heating peaks occur at thereattachment line which is at a distance of 0.15 times its height ahead of the step,and for...

     

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