阵列涡齿氢气循环泵的设计与性能分析

A structure scheme of array scroll was proposed based on asymmetric single arc modification to meet the requirements of the compact and large-displacement design of scroll Hydrogen Recirculation-Pump (HRP) in fuel cell hydrogen supply system. The parametric design and modeling were carried out for the HRP with double scrolls and triple scrolls. Two-dimensional Computational Fluid Dynamics (CFD) overset-mesh method was used to analyze the effects of the rotating speed and pressure rise on the performances of double-scrolls HRP, and the performance differences between the double scrolls HRP and the triple-scrolls HRP were compared. The results show that the pressure and temperature uniformity of triple-scrolls HRP is better. The performance of the double-scrolls HRP and the triple-scrolls HRP are greatly improved with the increasing rotating speeds or the decreasing pressure rising, the efficiency continues to drop by about 30% and 40% respectively when the pressure rises increase from 20 kPa to 100 kPa at design speed, and the tangential leakage and hydrogen backflow have a great impact on the performances of HRP. Under the requirements of design displacement and volume, the performances of the double scrolls HRP are better than that of the triple scrolls HRP, and the maximum efficiency difference is about 19%.