| 摘要 |
The tip has a short side of a ellipse defined by a portion of a converging diverging section. A quieter operation is achieved by having the long side of the ellipse define a portion of the converging diverging section with no other changes. A combination of increased flow and reduced noise can be achieved by combining changing the clearance between the vortex wall and the impeller with an elliptical surface as well as by reorienting the elliptical surface. |
