Centrifugal compressor impeller

摘要

Provided is a centrifugal compressor impeller which is characterized in that leading edges 7a on a shroud side of splitter blades 7 are offset from a circumferentially equidistant position between full blades 5R and 5F toward a suction side Sb of the full blade 5F, and trailing edges 7b on a hub side of the splitter blades 7 are offset from a circumferentially equidistant position between the full blades toward the suction side Sb of the full blade 5F, so that a tip leakage vortex W flowing from a tip clearance between the tips of the full blades 5F and the shroud toward the leading edges 7a of the splitter blades 7 flows over the leading edges 7a of the splitter blades 7.

主权项

1. A centrifugal compressor impeller, comprising:
a plurality of full blades that stand equally spaced in a circumferential direction and extend from a fluid inlet part to a fluid outlet part on a surface of a hub; and splitter blades each of which is disposed in a flow passage formed between two of the full blades arranged adjacent to each other so as to extend from a downstream point on a downstream side of the fluid inlet part in the flow passage to the fluid outlet part, wherein the centrifugal compressor includes a tip clearance between tips of the full blades and a shroud, and a leading edge portion on a shroud side of each of the splitter blades is offset from a circumferentially equidistant position between said two of the full blades at the downstream point toward a suction side of a front side full blade which is disposed on a downstream side in a rotational direction of the centrifugal compressor impeller among said two of the full blades, while a trailing edge portion on a hub side of each of the splitter blades is offset from a circumferentially equidistant position between said two of the full blades at the fluid outlet part toward the suction side of the front side full blade, so that a tip leakage vortex flowing from the tip clearance toward the leading edge portion of each of the splitter blades flows over the leading edge portion of said each of the splitter blades, or so that the leading edge portion of each of the splitter blades conforms to a direction of the tip leakage vortex, and wherein a trailing edge portion on the shroud side of each of the splitter blades is offset from the circumferentially equidistant position between said two of the full blades at the fluid outlet part toward a pressure side of a rear side full blade which is disposed on an upstream side in the rotational direction of the centrifugal compressor impeller among said two of the full blades.