IMPINGEMENT COOLING STRUCTURE

摘要

An impingement cooling structure comprises a plurality of shroud members (10) connected to each other in the circumferential direction so as to form a ring-shaped shroud surrounding a hot gas flow and a shroud cover (20) installed on the radial outer surfaces of the shroud members to form a hollow cavity (2) therebetween. The shroud cover has first impingement-cooling holes (22) which communicate with the cavity and perform impingement-cooling of the inner surface of the cavity by jetting cooling air to the inside of the cavity. The shroud member (10) has holed fins (12) dividing the cavity into sub-cavities. The holed fin has second impingement-cooling holes (12a) for jetting the cooling air (3), which flows from the first impingement-cooling holes into the holes (12a), diagonally toward the bottom face of the adjacent sub cavity.