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As an efficient, environmental and energy-saving transportation technology, the wheeled capsule transportation has promising application prospects. When the pipeline carriage was stationary in the pipe, it could be regarded as a crossing-cylinder structure. When water flowed around the structure, the vortices existed, which would cause energy loss. Therefore, the hydraulic characteristics at the downstream of the flow field around a pipeline car and the spatial vortices structure after the stabilized flow field were studied by numerical simulation, model test and theoretical analysis. The results show that the near-field areas of the downstream flow field of wheeled capsule with different diameters could be divided into the reflux zone and the jet zone. As the distance rose, the section-averaged velocity had a tendency of declining then rising in the near-field, and recovered the section-averaged velocity of pipe at the distance of the length of capsule. And in far-field, with the distance rose, the fluctuation of section-averaged velocity was gradually decreased, and the flow became stable. The eddy ring structures in the field were highly fractured, eddy structures were more on the side near the annular gap and less on the side near the pipe axis.
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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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