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通过改变前缘几何形状来分析其在设计攻角、非设计攻角下前缘附近的流动机理.研究结果表明:在宽工况范围内椭圆型前缘表现出了较优越的性能,不但在设计攻角下能很好抑制吸力峰的强度以避免前缘分离泡的产生,而且在较宽的攻角范围内都能保证前缘附近边界层状态基本不变.当正攻角很大时,不同前缘形状前缘附近都会出现分离泡,且会诱导边界层发生转捩,但椭圆型前缘边界层开始发生转捩的攻角会向大攻角方向移动.在20°攻角下,椭圆型前缘叶型的损失相比基准叶型下降了7%左右.进口湍流度的增加不会改变吸力峰的强度但可以减弱前缘分离泡的强度.
By changing the geometry of the leading edge, the flow mechanism near the leading edge at the design attack angle and the non-design attack angle is analyzed.The results show that the elliptical leading edge shows a superior performance in a wide range of working conditions, Under the design attack angle, the intensity of the suction peak can be well restrained to avoid the generation of the leading bubble, and the state of the boundary layer near the leading edge can be kept basically unchanged over a wide range of angles of attack. , The separation fronts will appear near the leading edges of different leading edges and will induce the transition of the boundary layer, but the attack angle of the oval leading edge boundary layer will start to shift towards a larger angle of attack. , The loss of the elliptical leading edge leaves is about 7% lower than that of the reference leaves.The increase of the inlet turbulence does not change the strength of the suction peak but can weaken the strength of the leading edge separation bubble.