The invention relates to the technical field of gas
turbine hot end cooling, and discloses a flat cat ear air film hole cooling structure applied to a gas
turbine and a construction method.The flat cat ear air film hole cooling structure comprises a
solid wall, the
solid wall is provided with an outer wall face and an inner wall face, and the outer wall face is used for making contact with a high-temperature mainstream; each air film hole comprises an
elliptic cylinder section arranged on the
solid wall and an expansion section communicated and coaxial with the
elliptic cylinder section, the joint of the
elliptic cylinder section and the expansion section is an inlet molded line, a
cold air inlet is formed in the inner wall face of the end, away from the expansion section, of the elliptic cylinder section, and a
cold air outlet is formed in the outer wall face of the end, away from the elliptic cylinder section, of the expansion section. An ideal anti-
kidney-vortex structure can be formed,
cold air is promoted to expand in the transverse direction, the spanwise coverage area of an air film is increased, and the wall attachment effect of the air film is improved, so that the
cooling efficiency of the air film is improved, meanwhile, uniform seam-shaped outflow can be formed, and the pneumatic loss caused by mixing of the cold air and main flow is reduced.