Method for reducing pneumatic noise of leading edge slat based on trailing edge micro-perforation

The invention discloses a method for reducing the pneumatic noise of a leading edge slat based on trailing edge micro-perforation. The method particularly comprises the steps as follows: setting a row of small holes at equal intervals in the wing unfolding direction at the trailing edge of the leading edge slat, wherein the perforation rate of the small holes in the unfolding direction is 2%, namely a line segment is made in the slat unfolding direction through the center of the small holes and the length of the line segment is the thickness of the slat in the unfolding direction; the sum of the lengths of all the small holes on the line segment is 2% of the whole thickness of the slat in the unfolding direction; the diameters of the small holes are 0.8-1 mm; and the distance between the center of the small holes and the trailing edge is 3-5 mm. According to the method, part of energy of sound waves is consumed in the small holes, a small amount of air stream on the lower surface of the slat flows to the upper surface of the slat through the small holes due to the pressure difference of the upper surface and the lower surface, and the vortex-shedding behavior of the trailing edge is influenced by locally changing the flow direction of the air stream in front of the trailing edge, so that the purpose of reducing the high-frequency sharp-frequency pneumatic noise generated by the slat is achieved, the pneumatic force is guaranteed to be not influenced basically at the same time; and the method is convenient to realize in engineering application.