| 摘要 |
PROBLEM TO BE SOLVED: To achieve high efficiency in an impeller and a fluid machine by reducing a low energy fluid stagnating at a negative pressure surface side of a blade.SOLUTION: An impeller comprises a hub 21 forming a circular ring shape and a plurality of blades 22 radially arranged along an outer circumferential surface of the hub 21. A pressure surface P1 of the blade 22 is provided with a first pressure surface 31 extending from a hub 21 side at an angle equal to or less than 90 degrees relative to the forward direction in a rotation direction A and a second pressure surface 32 extending from the first pressure surface 31 at an angle larger than 90 degrees relative to the forward direction in the rotation direction A. |
