| 摘要 |
PROBLEM TO BE SOLVED: To reduce low-energy fluid accumulated on the negative pressure surface side of a blade thereby to enable high efficiency, in an impeller and a fluid machine.SOLUTION: An impeller includes a hub 21 having an annular shape, and a plurality of blades 22 arranged radially along the outer peripheral surface of the hub 21. On a pressure surface P1 of the blade 22, provided are a first pressure surface 31 extending from the side of the hub 21 to a front side in a rotational direction A at an angle of 90 degrees or less, and a second pressure surface 32 extending from the first pressure surface 31 to the front side in the rotational direction A at an angle larger than 90 degrees.SELECTED DRAWING: Figure 1 |
