| 摘要 |
PROBLEM TO BE SOLVED: To provide an impeller and a fluid machine capable of improving efficiency by reducing a low-energy fluid stagnating on negative pressure surfaces of blades.SOLUTION: An impeller comprises: a hub 21 of an annular shape; and a plurality of blades 22 disposed radially along an outer circumferential surface of the hub 21, and a pressure surface P1 of each blade 22 includes a first pressure surface 31 extending from the hub 21 forward in a rotational direction A at an angle equal to or smaller than 90 degrees and a second pressure surface 32 extending from the first pressure surface 31 forward in the rotational direction A at an angle greater than 90 degrees. |
