Performance investigation of a multi‐nozzle ejector for proton exchange membrane fuel cell system,International Journal of Energy Research

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Performance investigation of a multi‐nozzle ejector for proton exchange membrane fuel cell system
International Journal of Energy Research ( IF 4.3 ) Pub Date : 2020-10-07 , DOI: 10.1002/er.5996
Jiquan Han ₁ , Jianmei Feng _{1,

2} , Tianfang Hou ₁ , Xueyuan Peng _{1,

3}

Affiliation

Due to its merit of no consuming energy, no moving part, and less requiring space, and maintenance, the ejector is one of the most promising hydrogen recirculation devices for proton exchange membrane fuel cell (PEMFC) applications. However, the prominent problem is its poor adaptability of the conventional ejector to meet the power range requirements of the PEMFC system. Thus, a multi‐nozzle ejector was investigated to widen the applicable power range of a PEMFC system. The designed multi‐nozzle ejector consists of one central nozzle (CN) and two symmetrical nozzles (SNs). The CN mode is activated under low power conditions, while the SNs mode is switched to adapt high power conditions. A 3D computational fluid dynamics (CFD) model was established to simulate the performance of ejectors, and an experimental test bench was built to validate the accuracy of the CFD model. The results indicated that the mixing chamber diameter (D_m) and throat tilt angle of SNs (α_t) have a significant effect on the entrainment performance. It was found that the multi‐nozzle ejector can broaden the hydrogen supply range from 0.27 to 1.6 g/s (22‐100 kW) with the optimal combination of a D_m of 5.0 mm and α_t of 8°. Nevertheless, the hydrogen supply range is 0.48 to 1.6 g/s (37‐100 kW) when using a conventional single‐nozzle ejector with a D_m of 5.0 mm. Moreover, the temperature, pressure, and relative humidity of the secondary flow have a great influence on the hydrogen entrainment ratio with the change of stack power.

中文翻译：

质子交换膜燃料电池系统多喷嘴喷射器的性能研究

由于其不消耗能量，不需要移动部件，所需空间和维护更少的优点，该喷射器是用于质子交换膜燃料电池（PEMFC）应用的最有前途的氢气再循环设备之一。但是，突出的问题是常规喷射器的适应性很差，无法满足PEMFC系统的功率范围要求。因此，对多喷嘴喷射器进行了研究，以扩大PEMFC系统的适用功率范围。设计的多喷嘴喷射器由一个中央喷嘴（CN）和两个对称喷嘴（SN）组成。CN模式在低功率条件下被激活，而SNs模式被切换以适应高功率条件。建立了3D计算流体动力学（CFD）模型来模拟喷射器的性能，并建立了一个实验测试台以验证CFD模型的准确性。结果表明，混合室直径（d_米）和SN的咽喉的倾斜角（α_吨）对夹带性能显著效果。已经发现，多喷嘴喷射器可以扩大氢气供应范围从0.27至1.6克/秒（22-100千瓦）与的最优组合d_米为5.0mm和α_吨的8°。但是，当使用D _m为5.0 mm的传统单喷嘴喷射器时，氢气供应范围为0.48至1.6 g / s（37-100 kW）。而且，随着堆功率的变化，二次流的温度，压力和相对湿度对氢的夹带率具有很大的影响。

更新日期：2020-10-07

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