| 摘要 |
<p>A turbocharger impeller (50) includes a hub portion (51) and a plurality of vane portions (52, 53). The hub portion (51) is substantially shaped as a truncated cone that gradually increases in diameter along a rotation axis (ZC). The vane portions (52, 53) are formed on a surface of the hub portion (51) and receive a fluid flowing along the rotation axis (ZC) and to force-feed the fluid in a radially outward direction. Grooves are formed in surfaces of the vane portions (52, 53). The grooves formed in the vane portions (52, 53) extend in a radially outward direction in which the fluid having flowed along the rotation axis (ZC) flows during impeller rotation. Crest portions are formed between adjacent grooves to protrude outwardly from the adjacent grooves. Crest portions in a central region near the rotation axis (ZC) are relatively higher in height than crest portions in an outer region further away from the rotation axis (ZC).</p> |
