Abstract
A micro-downsized radial-flow fan (Sirocco Fan) was made for using in the local cooling of electronic devices and its performance tests were carried out on scale effects. The outer diameter of the rotor is 8mm, and the blade chord length, the blade width, and the blade thickness are about 2mm, 8mm, and 0.2mm respectively. Variable parameters to examine the scale effect are diameter ratios D_1/D_2 of the rotor inlet to the outlet(0.4〜0.75), the number of blades(8〜20), scroll angles(6°〜12°), and the number of rotor revolution(3750〜8500rpm). As a results, it was found that the optimum D_1/D_2 is about 25% smaller than that of a popular Sirocco Fan and a flow rate is considerably affected by both the blade thickness and the number of blades.
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