Full
Outline
To address the issue of pressure overshoot during the reversing process of piston pumps，experimental tests and numerical simulations were conducted using coal slurry with a solid concentration of 68.5% as a case study.Cyclic pumping experiments were carried out under two pressure conditions，and the results were compared with numerical predictions.The study revealed that as the distance from the pipeline inlet increases，the rate of decrease in pressure overshoot accelerates，while the overshoot ratio gradually rises.For instance，at a steady‑state transport pressure of 5.17 MPa，the experimental overshoot ratio increased from 11.9% at the inlet to 15.23% near the outlet.Near the pipeline inlet，both maximum velocity and steady‑state velocity demonstrate minimal changes with distance，but beyond a certain point，the maximum velocity incrementally rises.Furthermore，the velocity overshoot at measurement point 11# under the two conditions is 66.9 mm/s and 17.3 mm/s，with overshoot ratios of 1.53% and 0.43%，respectively.The variation in overshoot magnitude was more pronounced than that of the velocity itself，with the transport velocity differing by 9.5%，while the overshoot ratio differed by as much as 255%.The findings provide valuable insights for optimizing the pumping strategy and the design of coal slurry pipeline 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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