Dynamic Measurement and Analysis of Pressure on VoluteWall of a Centrifugal Fan

Fluctuation of static pressure at 4 points on the volute wall of a centrifugal fan is measured with highfrequency pressure transducers. Through the analysis of the test results, the amplitude and frequency of the pressure fluctuations along the volute axial are obtained, and the air flow field near the volute tongue, position and the main form of instable flow are derived. The results can be used as a reference for improvement of noise and vibration situation of centrifugal fans.