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The goals of carbon peaking and carbon neutrality support the development of HFCV industry. Safe parking of HFCV in outdoor three-dimensional parking lot is the key to large-scale promotion. Therefore, a scaled-down physical experimental platform was built to investigate the effects of outdoor multi-story parking lot closure conditions (closed, semi-open, open), leakage location, mass flow rate nd aperture on hydrogen diffusion characteristics. The experimental results show that as the opening degree of the outdoor multi-story parking lot increases, and the related indexes of helium at the leakage source rise. For example, when the leakage occurs at the center with a large aperture at the flow rate is 0.18 kg/s, the maximum volume fractions of helium on the first, second, and third floors are 21.3%, 27% and 45.3%, respectively. The corresponding hydrogen volume fractions far exceed the lower explosive limit, posing an extremely high risk of combustion and explosion. With the increase of leakage mass flow, both the volume fraction and pressure of helium increase, and the safety risk increases. There is an obvious positive correlation between leakage mass flow rate of helium and volume fraction and pressure. Under the same degree of openness, helium tends to accumulate in corners, and its diffusion along walls is more efficient than that in open areas. The diffusion process is guided by the spatial boundary, showing a non-uniform diffusion trend. In addition, the larger the pore size, the higher the helium leakage rate.
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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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