阵列涡齿氢气循环泵的设计与性能分析

doi:10.3969/j.issn.1674-8484.2022.04.017

摘要/Abstract

摘要：

为满足燃料电池供氢系统的涡旋式氢气循环泵(HRP)紧凑化与大排量设计需求，提出了基于齿端非对称单圆弧修正的阵列涡齿结构设计方案，并对双齿与三齿涡旋氢气泵进行参数设计与建模。采用二维计算流体力学(CFD)重叠网格方法，分析了转速与压升对双齿氢气泵性能的影响，并比较了双齿与三齿氢气泵性能差异。结果表明：三齿氢气泵压力温度均匀性较好。随着转速提高或压升降低，双齿和三齿氢气循环泵性能均有所提高，当设计转速下的压升从20 kPa增至100 kPa时，效率下降约30%和40%，切向泄漏与排气回流对氢气泵性能的影响较大。在既定排量及体积下，双齿氢气泵性能优于三齿，效率差异最大约19%。

关键词: 燃料电池, 供氢系统, 涡旋氢气循环泵(HRP), 阵列涡齿, 重叠网格, 气动性能

Abstract:

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%.

Key words: fuel cells, hydrogen supply systems, scroll hydrogen recirculation pumps (HRPs), array scroll wraps, overset-mesh, aerodynamic performances

中图分类号:

U463.99

王瀚, 宋盼盼, 魏名山, 鲁振博, 李建威, 诸葛伟林, 张扬军. 阵列涡齿氢气循环泵的设计与性能分析[J]. 汽车安全与节能学报, 2022, 13(4): 760-769.

WANG Han, SONG Panpan, WEI Mingshan, LU Zhenbo, LI Jianwei, ZHUGE Weilin, ZHANG Yangjun. Design and performance analysis of the array scroll hydrogen recirculation pump[J]. Journal of Automotive Safety and Energy, 2022, 13(4): 760-769.

图/表 21

图1 阵列双涡旋齿

图2 非对称单圆弧修正齿形

图3 两种修正方法下涡旋齿型结构对比

图4 非对称单圆弧修正双齿结构排气容积

图5 阵列涡齿结构参数设计流程

基圆半径， R_b	4.16 mm
发生角， α	0.37 rad
起始展角， φ_s	1.508 rad
结束展角， φ_e	11.655 rad
偏心距， R_or	3.40 mm
径向间隙， C_r	40 μm
齿高， h	27.50 mm
齿厚， t	3.10 mm
节距， P_t	13.08 mm
涡盘直径， D_m	120.30 mm

表1 涡旋齿结构参数

图6 涡盘结构

图7 重叠网格数据传递

图8 计算域网格划分

	转速, n /（100 r·min^-1）	进口压力, p_in / kPa	进口温度, T / K	出口压力, p_out / kPa
设计工况	40	160	350	180
模拟工况点	30、40、50	160	350	180、200、220、240、260

表2 工况条件

图9 设计工况下温度和压力分布

图10 排气口处温度与速度分布

图11 变工况等熵效率

图12 变工况质量流量

图13 齿厚3.1mm时外接圆直径随齿数变化

图14 不同齿数下外接圆直径随齿高变化

图15 三齿模型

图16 三齿结构设计工况下温度分布

图17 三齿结构设计工况下压力分布

图18 不同齿数等熵效率对比

图19 不同齿数质量流量对比

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