涡流发生器形状对DU91-W2-250翼型动态失速的影响机理分析

以DU91-W2-250翼段为研究对象,分析不同形状涡流发生器（VGs）对动态失速的影响规律。结果表明：改变VGs形状参数对增升效果影响较大,对减阻效果影响较小,矩形VGs增升减阻效果更佳。从作用机理看,影响流动控制的主要是VGs流向涡涡流强度。矩形VGs气动性能提升效果明显最佳。矩形VGs流向涡在x/c=0.30~0.50范围内边界层内外流动掺混剧烈,抑制流动分离效果更佳。

ANALYSIS OF INFLUENCE MACHISM OF VGS SHAPE PARAMETERS ON DYNAMIC STALL OF DU91-W2-250 AIRFOIL

Taking the DU91-W2-250 airfoil segment as the research object, the influence of vortex generators （VGs） with different shapes on its dynamic stall is analyzed. The results show that changing the shape parameters of VGs has a greater impact on the lift increasing effect, but less impact on the drag reduction effect, and the rectangular VGs has a better lift increasing and drag reduction effect than that of the triangular VGs and the trapezoid VGs. From the action mechanism, the flow control is mainly affected by the intensity of VGs flow direction vortex. The results show that the flow direction vortex of rectangular VGs has strong strength, slow attenuation, strong ability of restraining flow separation, and more obvious effect of increasing lift. The rectangular VGs has the best aerodynamic performance. In the range of x/c=0.25~0.50, the flow mixing inside and outside the boundary layer of rectangular VGs is severe, and the effect of restraining flow separation is better.