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Outline
To investigate the thermodynamic performance variation of a two‑stage hydraulically driven piston compressor for hydrogen refueling stations under varying suction pressures，a thermal simulation model of the two‑stage hydraulically driven piston compressor coupling the hydraulic system and gas compression system was constructed，and the model was experimentally validated.The results show that the maximum error between the simulated and experimental thermodynamic performance parameters is 2.7%，indicating good agreement.When the second‑stage discharge pressure remains unchanged and the first‑stage suction pressure decreases from 20.0 MPa to 3.0 MPa，the first‑stage pressure ratio remains essentially constant，while the second‑stage pressure ratio increases；the discharge temperature of the first‑stage cylinder remains around 120.0 ℃；the discharge temperature of the second‑stage cylinder increases from 54.1 ℃ to 224.1 ℃，the first‑stage shaft power decreases from 60.2 kW to 14.9 kW，the second‑stage shaft power increases from 12.7 kW to 35.5 kW，and the mass flow rate decreases from 55.5 kg/h to 7.1 kg/h.The two‑stage dual‑cylinder hydraulically driven unit is suitable for constant suction pressure conditions.When operating under varying suction pressure conditions，issues such as excessively high discharge temperature，unbalanced shaft power，and low motor efficiency occur.To address this problem，an operational strategy of using high speed under low‑pressure conditions and low speed under high‑pressure conditions can be adopted.The study provides a theoretical basis for the optimization of hydraulically driven piston compressor systems.
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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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