射流式旋涡发生器最佳速度比的工程估算方法

本文从分析侧斜射流-横向流干扰的涡流场出发,讨论了用于附面层控制的射流式旋涡发生器速度此的选择问题。提出了使壁面处产生最大涡诱导速度的速度比Ropt.v和使附面层形状因子获得最大改善的速度比Ropt.H。根据涡参数变化的经验关系推得确定Ropt.v的经验公式,结合射孔后倒流区范围的试验结果,可以估算Ropt.H,估算值与平板附面层试验测量结果相符。 

A PREDICTION METHOD FOR OPTIMUM VELOCITY RATIO OF AIR JET VORTEX GENERATOR

The selection of the velocity ratios for air jet vortex generator is considered. The concept of the optimum velocity ratio with the maximum vortex induced velocity at the wall,Ropt·v ,and the concept of the optimum velocity ratio maximizingshape factor of boundary layer ,Ropt·H, are introduced.Based on the empiricalrelationships summarized from the measured data of the side-inclined jet/ crossflow interaction flow field, the formulas forRopt·v may be deduced as follows Ropt·v = 3.22(X/D + 0.3019)-0.219 R≤1.8Ropt·v = 2.75(X/D + 0.3019)-0.111 R≥1.8The predicted values of Ropt.Hare determined according to the experimental results of the reverse flow region behind the jet hole in association with the Ropt·v empirical formulas. They agree with the measurements of the boundary layer at the flate plate.