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Outline
In response to issues such as temperature rise and uneven temperature distribution within the hydrogen pressure reducing valve （HPRV） caused by the Joule-Thomson effect，the relationship between key geometric structure of the HPRV and its internal flow characteristics as well as temperature distribution was investigated.Sixteen reducing valve structures were designed based on the Taguchi method.The flow characteristics inside the valve were numerically analyzed using computational fluid dynamics （CFD），and a valve test platform was built to validate the numerical results.Taking the flow coefficient and temperature distribution uniformity in the control chamber as response indicators，the contribution rates of different geometric parameters were analyzed.The results show that the spool angle θ has the greatest effect on the flow coefficient of the reducing valve，while the control chamber area Ar and the thin pipe diameter D exerts the most significant influence on the temperature distribution uniformity in the control chamber.The optimal combination of geometric parameters is Ar=1 800 mm2，D=2.5 mm，and θ=55°.Compared with other schemes，the flow coefficient of the optimal parameter combination is increased by up to 88.2%，and the uniformity of temperature distribution is reduced by up to 93.2%.The increase of θ and D leads to a rise in the pressure gradient of the main valve core，intensifying the Joule-Thomson temperature rise effect.The fine pipe structure delays the diffusion of low‑pressure hydrogen in the control chamber to the outlet，promoting the uniform distribution of hydrogen temperature in the control chamber.However，variations in the tube diameter do not affect the pressure stabilization characteristics of the control chamber.The study can provide a reference for the design of hydrogen pressure reducing valve.
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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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