Stationary vane and centrifugal compressor provided with stationary vane

Abstract

A stationary vane includes: a side surface exposed to a fluid and that is provided along a flow direction of the fluid; and corner portions provided in the side surface and that generates, at a downstream side in the flow direction of the fluid, streamwise vortexes each having a vortex axis that is parallel to the flow direction of the fluid.

1 . A stationary vane provided to a fluid machine, the stationary vane comprising:
 a side surface exposed to a fluid and formed along a flow direction of the fluid; and   a corner formed on the side surface, wherein   the corner generates a streamwise vortex with a vortex axis extending along the flow direction of the fluid, on a downstream side in the flow direction of the fluid.   
     
     
         2 . The stationary vane according to  claim 1 , wherein the corner is formed by a ditch recessed from the side surface. 
     
     
         3 . The stationary vane according to  claim 2 , wherein
 a plurality of the ditches are formed on the side surface, arranged in a direction intersecting the flow direction of the fluid, and   the ditches have different shapes depending on a speed of the fluid flowing along the side surface in a vicinity of each of the ditches.   
     
     
         4 . A centrifugal compressor including:
 a casing;   a rotating shaft rotatably supported by the casing;   an impeller provided to the rotating shaft and that is rotationally driven together with the rotating shaft; and   a flow path formed in the casing and that houses the impeller, wherein   the centrifugal compressor compresses a fluid by passing the fluid through the flow path, and   the centrifugal compressor comprises the stationary vane according to  claim 1  in the flow path.   
     
     
         5 . A centrifugal compressor including:
 a casing;   a rotating shaft rotatably supported by the casing;   an impeller provided to the rotating shaft and that is rotationally driven together with the rotating shaft; and   a flow path formed in the casing and houses the impeller,   the centrifugal compressor compresses a fluid by passing the fluid through the flow path, and   the centrifugal compressor comprises the stationary vane according to  claim 2  in the flow path.   
     
     
         6 . A centrifugal compressor including:
 a casing;   a rotating shaft rotatably supported by the casing;   an impeller provided to the rotating shaft and that is rotationally driven together with the rotating shaft; and   a flow path formed in the casing and houses the impeller,   the centrifugal compressor compresses a fluid by passing the fluid through the flow path, and   the centrifugal compressor comprises the stationary vane according to  claim 3  in the flow path.