170 kW燃料电池系统引射器关键结构参数影响研究

doi:10.19562/j.chinasae.qcgc.2022.12.010

Abstract

Abstract:

Hydrogen re-circulation driven by ejectors in high-power fuel cell systems is promising in the future. However， the outstanding problem is that the performance of ejectors is significantly poor under low power conditions， which results in the inefficiency of the ejector working in the wide power range of fuel cell systems. In this paper， a three-dimensional numerical model is established for the ejector used in a 170 kW fuel cell system. The influence of two key geometric parameters including throat diameter of the primary nozzle （D_t） and mixing chamber diameter （D_m） is analyzed under a wide range of working conditions. Moreover， the optimal combination of geometric parameters applicable for a wide power range is discussed. The results show that a large pressure difference is generated in the ejector due to a small D_m， thereby preventing the backflow of the secondary flow. Hence the performance of the ejector can be improved under low power conditions. Furthermore， the best performance is obtained when D_m / D_t is 2.5~3.0， which leads to an increase in the power range from 70~170 kW to 40~70 kW （i.e. an increase of nearly 43%）. The research results provide an important reference for the design of ejectors used in fuel cell systems with power above 170 kW.

Key words: ejector, high power fuel cell, wide operating conditions, numerical simulation

Zihui Pang,Jiquan Han,Ping Chen,Yunmei Liu,Jianmei Feng,Xueyuan Peng. Research on the Influence of Key Structural Parameters of Ejectors for a 170 kW Fuel Cell System[J].Automotive Engineering, 2022, 44(12): 1889-1895.

Figures/Tables 16

References 15

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工况	功率/kW	进口质量流量m_p/（g·s^-1）	需求计量比
1	20	0.269	2.8
2	40	0.583	1.7
3	70	1.03	1.5
4	100	1.48	1.4
5	125	1.93	1.3
6	150	2.40	1.25
7	170	2.91	1.2

项目	设置
湍流模型	SST k-w
求解方法	压力-速度耦合
求解算法	SIMPLE算法
梯度项离散格式	least squares cell-based scheme
压力项离散格式	second-order
其他项离散格式	second-order upwind

工况参数	中低功率	高功率
一次流质量流量/（g·s^-1）	0.269~1.03	1.03~2.91
一次流温度/K	293	293
二次流温度/K	327	333
二次流入口压力/kPa	129~158	158~253
混合流出口压力/kPa	139~172	172~278
二次流中水蒸气质量分数/%	48.5	43.4

参数组别	D_t/mm	D_m/mm	D_m/D_t
D_t	2.1，2.3，2.5	7.4	2.9~3.5
D_m	2.1	3.2，4.2，5.3，6.3，7.4，8.4，10.5，12.6	1.5~6

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Research on the Influence of Key Structural Parameters of Ejectors for a 170 kW Fuel Cell System

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