| 摘要 |
PROBLEM TO BE SOLVED: To provide a film cooling structure for restricting a cooling medium film from peeling off from a wall surface, efficiently cooling the wall surface and is easily manufactured.SOLUTION: A film cooling structure comprises a main passage 3 communicating with an injection opening 2 arranged at a wall surface 1 adjacent to a passage of high temperature gas G, a pair of branched passages 4, 5 branched from the main passage 3, and communication passages 6, 7 communicating these passages to each other. Injecting directions A, B of these cooling media CL4, CL5 got from the pair of branched passages 4, 5 are set to be inclined in respect to a flowing direction of the high temperature gas G so as to form eddy flows V1, V2 in a direction where these cooling media are pushed against the wall surface 1 from each other. Cross sectional surfaces of the main passage 3 and the branched passages 4, 5 have the same prescribed inner diameter D, the communication passages 6, 7 have envelopes 16, 17 in which groups of true circular holes with a prescribed inner diameter D are connected from each other. A main longitudinal angle α1 formed by an axis center C3 of the main passage and the wall surface 1 is larger than a branched longitudinal angle α2 formed by axis centers C4, C5 of the branched passages 4, 5 and the wall surface 1. |
