Abstract
In our previous study, a design tool based on computational fluid dynamics (CFD) and numerical optimization was developed. Commercial CFD software (STAR-CD) and a simulated annealing algorithm were used to maximize fan efficiency in the design tool. Fan efficiency of the optimized fan using the design tool was increased remarkably by experimentation. In this study, blade shapes and total pressure distribution of the initial and optimized fans are compared to investigate design scheme for high efficiency fan. This investigation shows that spanwise total pressure distribution of the optimized fan is uniform compared to that of the initial one. Therefore, uniform distribution of total pressure is an important factor in designing a high efficiency fan. A further finding is that convex spanwise distribution of the setting angle is the key factors in increasing fan efficiency and that convex spanwise distribution of solidity and the sweep angle are secondary factors.
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