Abstract
An axial flow fan is designed with large tip clearance by using the FANDAS code and then is manufactured by 3-D printer. The fan performance curve is measured by chamber-type test facility, and the measured fan flow capacity and static pressure are much lower than the design values. Through the application of CFD technique to the designed fan, it is shown that the fan performance deterioration results are due to the leakage and the secondary vortex flows through large tip clearance. In order to control the tip clearance flow, the present study employs fan blade equipped with winglet. The CFD analysis results of the fan with winglets show no leakage and secondary vortex flow through tip clearance and performance measurement results also show the performance improvements of flow capacity and static pressure by 300 CMH and 1.3 mmAq compared with the fan without winglets.
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