| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a refractory metal core having improved cooling passageway legs, and to provide a blade outer air seal (BOAS) cast using the core. <P>SOLUTION: A baseline BOAS is reengineered, and a cooling air port 60 is shifted toward a plane 510 and away from a side rail. The shift from the side rail may reduce the risk of low cycle fatigue (LCF) cracking. The reengineering may also add a series of obstacles/obstructions such as a metering wall 170 and post 172 in a leg between the shifted location of the port 60 and the adjacent end 134. The obstacles may serve to restrict the amount of flow which would otherwise flow out from outlets 101A and 101B and, thereby, provide a desired circumferential flow bias. By metering of the flow, the obstacles permit the presence of the outlets 101A and 101B in the adjacent circumferential end rather than necessitating their elimination. <P>COPYRIGHT: (C)2008,JPO&INPIT |
