公开(公告)号：US20170108219A1

公开(公告)日：2017-04-20

申请号：US15273243

申请日：2016-09-22

Applicant: ROLLS-ROYCE plc

Inventor： John E. T. RIMMER ,  Nicholas M. BROWN

IPC: F23R3/00

CPC classification number: F23R3/002 ,  F05D2260/201 ,  F05D2260/202 ,  F23R3/04 ,  F23R3/06 ,  F23R3/60 ,  F23R2900/03041 ,  F23R2900/03042 ,  F23R2900/03044

Abstract: In an embodiment of the invention, a dual-wall casing for a combustor comprises an outer wall and an inner wall defining a channel therebetween. The walls are fastened together by a bolt which extends from the inner wall and across the channel. In use, the inner wall is exposed to combustion products. Cooling is provided by a primary inlet hole extending through the outer wall and arranged upstream (with respect to the direction of flow of coolant in the channel) of the bolt and an array of effusion holes extending through the inner wall and positioned with their inlet in line of sight of the primary inlet hole. The primary inlet hole is sized with respect to the array of effusion holes such that it has a flow area which causes locally negligible flow restriction.