燃料电池阳极排气系统引射增压循环方案实验研究

Experimental Research on Ejection and Booster Scheme of Fuel Cell Anode Gas Recirculation System

阳极排气循环方式对燃料电池的性能有重大影响。本文提出了风机位于引射器二次流入口前和风机位于引射器混合流出口后等两种循环增压串联配置方案,搭建了引射器与风机联合实验系统,在不同风机频率下实验研究了二次流温度冷热态及风机位于前后的总体引射增压性能。结果表明,随着引射比的增大,引射器和风机的增压比均呈现减少趋势;风机频率越高,转速越快,增压比越大;热态工况下,由于二次流向主流传热,主流密度减小从而速度增大,引射比较小时相同引射比下增压比增大;当风机位于引射器混合流出口后时,风机全压更大,增压性能更强,最高增压可提高超过10%,风机在后的配置方案更佳。

t The anode exhaust cycle has great infuence on the performance of fuel cell.In this paper,two kinds of cyclic booster series configuration schemes are proposed.One scheme is that the blower is located in front of the ejector secondary fow,and the other is that the fan is located behind the ejector mixed fow outlet.A corresponding high temperature“ejector and blower combined”experimental system is built to study the overall ejection supercharging performance of the secondary fow temperature in hot and cold state and the blower in front of or behind ejector.The results show that the pressure lift ratio of ejector and blower decreases with the increase of entrainment ratio.The higher the blower frequency,the faster the speed,the greater the supercharging ratio;Under the hot condition,the density of the main stream decreases and the velocity increases due to the heat transfer from secondary flow to primary fow,and the pressure lift ratio increases under the same entrainment ratio when the entrainment ratio is low.When the blower is located behind the ejector mixed flow outlet,the total pressure of the blower is larger,and the pressurization performance is stronger.The maximum pressurization can be increased by more than 10%,and the rear configuration of the blower is better.