Abstract
Hydrogen circulation pump is an important equipment for hydrogen fuel cell system which can recycle the unreacted hydrogen to improve the system efficiency. A mathematical model of claw pump is built and the internal flow field was simulated by dynamic mesh technology. The p-θ diagram is obtained by analyzing the gas flow characteristics. The model is firstly verified by air experiments and then the performance influenced by suction pressure, exhaust pressure, rotating speed, and clearance are analyzed. The volumetric efficiency increased by 22% when the suction pressure increases from 152 kPa to 168 kPa but decreased by 23% when the exhaust pressure increases from 172 kPa to 188 kPa. The volumetric efficiency increased by 26.7% when the rotating speed increases from 4000 rpm to 6000 rpm but decreased by 52.1% when the working clearance increases from 0.03 mm to 0.07 mm. Due to the range of working pressure ratio is small, the indicated efficiency changes slightly.
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