Abstract
This study deals with the design method of an axial fan that can make a blade by parameterizing the blade outlet angle as a function of the hub ratio, assuming that the optimal total pressure distribution in the span direction is a non-free vortex flow. In addition, the performance of the designed axial fan was obtained by analyzing it with large eddy simulation (LES) in a three-dimensional, incompressible flow. As a result, the exponent of the total pressure ratio function that satisfies the diffusion factor 0.6 or less ranges from 0.49 to 1.0 for each radius. The static pressure, the total and respective efficiencies of the axial fan analyzed by LES have similar sizes to those of the existing axial fan. On the other hand, it can be designed while predicting the total pressure according to the geometric size of the axial fan at the operating point if this design method is combined with the Cordier diagram. It is judged that the design method of this axial fan can be very usefully used as a general axial fan or ducted axial fan.
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