The mechanism of noise reduction for non-smooth leading edge vane was that the non-smooth shape has the characteristic of rectify flow around the airfoil and the control the turbulent breakaway.

• 有效减少气流流经前后翼型表面时翼型间扰流作用，起到良好的导流作用，使后翼型来流平稳，气流噪声降低。