Patent ID: 6709233
Filing Date: 2004-03-23
Classification: F01D,Y10S

Abstract:
A turbine stator vane for use in a ring of similar vanes arranged in an axial flow turbine having an annular path for a turbine working fluid, the vane comprising: an aerofoil spanning the annular path and having a radially inner platform region, a radially outer tip region, an axially forward leading edge and an axially rearward trailing edge, the aerofoil having a pressure surface and a suction surface which are respectively convex and concave between the platform region and the tip region in a plane extending both radially of the annular path and transversely of an axial direction, the trailing edge of the aerofoil being straight from the platform region to the tip region and oriented radially of the annular path, and said convex and concave curvatures of the aerofoil pressure and suction surfaces being achieved by rotational displacement of aerofoil sections about the straight trailing edge, the aerofoil having an axial width which is substantially constant over substantially all of a radial height of the aerofoil, and a chord line at mid-height of the aerofoil sections being shorter than chord lines in the aerofoil sections at the platform and tip regions.