EXHAUST DIFFUSER FOR A GAS TURBINE

摘要

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.

主权项

1. An exhaust diffuser for a gas turbine, the exhaust diffuser comprising:
an annular duct having an inlet end and an outlet end, the annular duct being delimited by an inner wall and by an outer wall radially surrounding the inner wall; and a row of first struts arranged at a first axial position in the annular duct, the first struts connecting the inner wall and the outer wall and being distributed over the circumference of the annular duct, each of the first struts having a leading edge facing the inlet end and a trailing edge facing the outlet end, wherein the annular duct has a cross-sectional area which decreases towards the outlet end in a region downstream of the trailing edges of the first struts to a local minimum and then increases again towards the outlet end.