公开(公告)号：US20150016982A1

公开(公告)日：2015-01-15

申请号：US14498201

申请日：2014-09-26

Applicant: ALSTOM Technology Ltd

Inventor： Willy Heinz Hofmann ,  Philipp Schaefer

IPC: F01D25/30

CPC classification number: F01D25/30 ,  F01D9/02 ,  F01D25/28 ,  F02C7/20 ,  F02K1/04 ,  F05B2250/711 ,  F05B2250/712 ,  F05B2250/713 ,  F05D2240/90

Abstract: An exhaust diffuser for a gas turbine includes an annular duct. A row of struts is arranged in the duct. In a region downstream of the trailing edges of the struts, the cross-sectional area of the duct decreases to a local minimum and then increases again towards the outlet end of the duct. Thereby the gas flow is locally accelerated downstream of the struts. This stabilizes the boundary layer of the flow in this region and leads to a marked increase in pressure recovery for a wide range of operating conditions.

Abstract translation: 燃气轮机的排气扩散器包括环形管道。 一排支柱布置在管道中。 在支柱的后缘下游的区域中，管道的横截面面积减小到局部最小值，然后再次朝管道的出口端增加。 从而气流在支柱的下游局部加速。 这使得该区域中的流动的边界层稳定，并且在宽范围的操作条件下导致压力恢复的显着增加。