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Based on a 200 kW peak power three-stack common-rail Proton Exchange Membrane Fuel Cell (PEMFC), the steady Computational Fluid Dynamics (CFD) iterative calculation between the single pulse valve ejector and the multi-stack common-rail pulse valve ejector under and hydrogen supply system was carried out by Fluent software, and the ejector scheme was determined. Then the reliability of the design and simulation was verified by the ejector bench test. The influence factors of pulse valve ejector were simulated and analyzed, from which we can know that with the same pressure variation, the injection pressure of secondary flow has the greatest influence on the ejection coefficient, followed by the inlet pressure, and the injection pressure has the least influence. Meanwhile, nitrogen content has great influence on the ejection coefficient. Finally, the transient simulation analysis of the pulse valve ejector was carried out. The results show that, compared with the steady state results, the ejection coefficient calculated under transient state has a large margin, so it can further cover the low power condition. Keeping the duty cycle unchanged and increasing injection frequency are beneficial to the improvement of ejection coefficient.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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