Abstract
The present study provides a performance analysis method of forward swept axial flow fan. The present performance analysis method of forward swept axial flow fan incorporates the radial equilibrium equation formulated along swept-blade coordinate with spanwise pressure loss and flow deviation models. The pressure losses in fan are categorized into blade profile, secondary flow, end-wall boundary layer and tip clearance losses, and they are calculated by the corresponding correlations expressed in terms of the flow variables defined on swept-blade coordinate. The flow deviation at fan blade outlet is also calculated by the correlation model considering on- and off-design effects. The present analysis method predicts overall performance characteristics by the mass-weighted averaging of spanwise flow calculation results. For the verification of the present fan performance prediction method, various forward-swept fan models with different design specifications and operation conditions are considered and their prediction results are compared with the test and the CFD results. The comparisons between the present calculation and the test/C FD results show very good agreements in f low field and overall fan performance predictions.
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