S0505-1-5 Reduction of Noise in a Wing Profile Centrifugal Blower : The measurement of the flow in air blower

Abstract

We focus attention on the noise by a flow by the wing passage colliding in a cut-off. Because the noise causes by a pressure change, We made a flow in the blower visible mainly on the cut-off and carried out PIV analysis. Moreover, by performing the velocity fluctuation measurement using the heat wire current meter, examined a correlation with the pressure of the flow field of the neighborhood of the cut-off. As a result, it was found out that there is the stagnation area and it changes by turning of the wing. It was also found that the peak value of 600Hz rises the motor side in comparison with the inlet side and the velocity fluctuation ingredient tends to grow up.