Flap and aircraft

The invention relates to the technical field of aircraft noise reduction, in particular to a flap and an aircraft. According to the flap provided by the embodiment of the invention, the first vent hole is formed in the side edge of the flap, the first vent hole is provided with the first air inlet and the first air outlet, the first air inlet is formed in the lower surface of the flap, and the first air outlet is formed in the side surface of the flap; gas entering from the first gas inlet is exhausted through the first gas outlet formed in the side surface of the side edge of the flap, the gas exhausted from the first gas outlet can effectively dissipate the strength of the vortex system structure of the side edge of the flap, and meanwhile the vortex nucleus of the vortex system structure of the side edge of the flap is pushed to the position away from the wall face. Therefore, the interaction between the vortex system structure and the wall surface is reduced, the dynamic pressure load on the surface of th