Simulating Internal Flow Characteristics of Claw-type Hydrogen Circulation Pump in Fuel Cell System
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摘要: 爪式氢气循环泵具有输气平稳、适应工况范围广、效率高等优点,是燃料电池系统的关键设备。建立了氢气循环泵数学模型,数值模拟了其内部流动特性,获得了工作腔内流场分布规律。结果表明:转子工作过程存在等容输送过程,形成的两侧工作腔内气体压力、温度均存在差异,泄漏导致容积较小的工作腔内压力较高,两者压力差约为8.1 kPa。两侧工作腔内压力随间隙、吸排气压力的增大而增大,温度随吸气压力的增大而减小。转子最大热变形位于转子爪尖处。模拟结果与实验值基本吻合,验证了模拟方法的准确性。Abstract: The claw-type hydrogen circulation pump is the key equipment of a fuel cell system, which has the advantages of stable gas transmission, wide operating range and high efficiency. In this paper, the mathematical model of the hydrogen circulation pump is established, its internal flow characteristics are numerically simulated, and the flow field distribution law in its working chamber is obtained. The results show that there is an equal-volume conveyance process in the working process of the rotor of the circulation pump. The gas pressure and temperature in the two working cavities are different, and the leakage leads to higher pressure in the working chamber with smaller volume, with the pressure difference being about 8.1 kPa.The pressure increases with the increase of clearance, suction and discharge pressure; the temperature decreases with the increase of suction pressure. The maximum thermal deformation of the rotor is located at the rotor's claw tip.The simulation results are basically consistent with the experimental values, thus verifying the accuracy of the simulation method.
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Key words:
- hydrogen circulation pump /
- numerical simulation /
- flow field /
- deformation
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表 1 模拟参数
Table 1. Simulation parameter
参数 数值 参数 数值 进口压力/kPa 260 轴向间隙/mm 0.06 出口压力/kPa 280 径向间隙/mm 0.06 进气温度/℃ 75 转速/(r·min−1) 5000 表 2 转子变形大小
Table 2. Rotor deformation size
角度/(°) 最大变形值/mm 角度/(°) 最大变形值/mm 60 4.10 × 10−2 180 4.36 × 10−2 120 4.15 × 10−2 270 4.42 × 10−2 -
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