An experimental study on the aerodynamic performance of multi-blade blowers. (3rd report Prediction of the pressure losses in blowers)

Abstract

Experimental studies are conducted to develop a method of predicting the pressure losses in multi-blade blowers. A loss model in constructed for the losses in the impeller and the losses. in the scroll separately. The losses in the impeller are supposed to consist of shock loss, separation loss, curvature loss, skin friction loss and mixing loss. On the other hand, the losses in the scroll are supposed to consist of shock loss of radial and peripheral directions, and skin friction loss. For the maximum efficiency flow, separation loss and shock loss are great at the impeller, and shock loss of radial direction and skin friction loss are great at the scroll. Those pressure losses in the scroll have tendency to increase remarkably with the increase of flow.