Patent ID: 6533545
Filing Date: 2003-03-18
Classification: F01D,Y10S

Abstract:
A moving turbine blade in a turbine having a multiplicity of the moving turbine blades disposed in a circumferential direction of an impeller, the moving turbine blade being acted on by a fluid, which has left stationary blades as fixed blades, to transmit a rotating force to the impeller, wherein:the moving turbine blade has a front edge shape comprised of a circle or an ellipse, and two curves of a dorsal surface and a ventral surface in contact with the circle or ellipse, the curve of the dorsal surface is defined such that the curve of the dorsal surface and a stationary blade wake are not parallel to each other adjacent a point of contact between the circle or ellipse of the front edge and the curve of the dorsal surface, wherein an angle which a tangent at the point of contact between the circular or elliptical shape of a front end portion of the front edge and the curve of the dorsal surface makes with a straight line perpendicular to a rotating shaft of the turbine, is designated as &thgr;, and a geometrical outlet angle of the stationary blade is designated as &agr;N, where, &agr;N=sinâˆ’1(&dgr;N/CN) where &dgr;N is the stationary blade throat width which is the distance from a rear edge of a stationary blade to the dorsal surface of an adjacent stationary blade and CN is the stationary blade pitch and is the distance between adjacent stationary blades, and &thgr; is related to &agr;N by the following relationship: &agr;N+2Â°N+12Â°.