| Summary: | 碩士 === 國立臺灣大學 === 機械工程學研究所 === 95 === Blowers play key roles in the operation of fuel cells system. Fuel cells rely on blowers to supply air to the cathode in the stack and the blower efficiency is a critical factor in maximizing the overall efficiency of a system. For these reason, how to find out the blower which can provide high pressure, high efficiency, low power consumption and minimum volume is vitally important in design of fuel cells system.
In this study, we create the effective design method of high speed blower for fuel cells system. We use the empirical formulas to make up prototype. Then we can observe the inner flow change in blower with CFD software and put forward some strategies to improve the problem found in inner flow region.
According to analysis, there are some strategies to promote blower efficiency at the design point flow rate（0.5cmm）. To increase length of blades and reduce the volume of casing will promote the air be better guided, and ease the pressure change of air. To increase the number of blades will reduce the reverse flow near the outlet of impeller. They all will results in the rise of static pressure and performance. Finally, to decrease the height of impeller and casing will reduce electric power costed and result in the substantial rise of performance.
By using these strategies, we design the grate shape of 5kW fuel cells blower which can provide 12,486Pa in static pressure, 64.2% in efficiency, and only requires about 219W at the design point flow rate. It is nearly as good as the performance of AMETEK fuel cells blower products. The design method created in this study is proved to be useful to design the high performance, high speed blower.
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