Abstract
This paper presents a parametric study on the effects of blade angle and blade radial angle with a previously validated numerical thermal fluid flow model. Detailed flow structures and pressure distributions are presented for various cooling fan working conditions. The flow rates of the cooling air, pressure differentials, the fan shaft works, and the cooling fan efficiencies are all quantified. Results indicate that at zero pressure differential condition, the air flow rate and the fan efficiency both reach their maximum when the blade angle is 41.5°. Blade angle of 16.6° gives the maximum pressure head at zero flow rate. The performance of the fan is determined by the fluid driving characteristic of the blades and the leakage flow through the clearance gap. The blade radial angle does not improve the fan performance. Guidance on motor cooling design is given based on the cooling flow characteristics varying with the blade angle.
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