| 摘要 |
A rotating blade (1) for a gas turbine comprises an internal cooling structu re having at least three cooling air passages (5-7) in fluid connection with on e another by means of turns (9, 10). An opening (12) provides an outlet for dissolved core material to be removed from the blade following casting of th e cooling structure without any residue remaining within. According to the invention, the cooling structure comprises trip strips (13, 15) in the first and second passage (5, 6) with specified ratio of height to distance between trip strips and th e trip strips (13) in the first passage being arranged at 900 with respect to the directio n of airflow. In a particular embodiment, the trip strips (15) in the second passage (6) are arranged at angle of 45.degree.. The design according to the invention assures sufficient airflow through first and second air passages (5, 6).
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