Abstract
In order to clarify the relationship between performances and internal flows in a low specific-speed diagonal flow fan, the experimental and numerical investigations ware carried out. The test fan is radial-outflow type diagonal flow fan similar to centrifugal fan and its specific-speed is 670[min^<-1>, m^3/min, m]. The velocity fields at rotor outlet were measured using a slant hotwire probe and the wall pressure on the outer casing was found out using a highly responded pressure transducer. The numerical simulations were carried out at the same flow condition. As results, the fan performance was very good near the design point. Near design flowrate, it is found that tip leakage vortex was occurred. At excessive flowrate, it is found that separated flow was occurred on blade pressure surface.
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