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Study on influence of drill pipe rotation speed on coal particles-gas flow characteristics in negative pressure sampling process
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Hongtu ZHANG1, 2, 3, Zedong ZHEN1, Botao LI1, 2, 3, **, Ouya ZHANG4
China Safety Science Journal | 2025, 35(4) : 94 - 100
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China Safety Science Journal | 2025, 35(4): 94-100
• Safety engineering technology •
Study on influence of drill pipe rotation speed on coal particles-gas flow characteristics in negative pressure sampling process
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Hongtu ZHANG1, 2, 3, Zedong ZHEN1, Botao LI1, 2, 3, **, Ouya ZHANG4
Affiliations
  • 1 School of Safety Science and Engineering，Henan Polytechnic University，Jiaozuo Henan 454003，China
  • 2 State Key Laboratory Cultivation Base for Gas Geology and Gas Control，Jiaozuo Henan 454003，China
  • 3 State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization，Henan Polytechnic University，Jiaozuo Henan 454003，China
  • 4 Art College，Xiangtan University，Xiangtan Hunan 411100，China
Published: 2025-04-28 doi: 10.16265/j.cnki.issn1003-3033.2025.04.0998
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In order to investigate the impact of drill pipe rotation on coal particles transport efficiency during negative pressure sampling，CFD and DEM were used to explore the effects of drill pipe rotational speed and coal particles mass flow rate on gas-solid flow characteristics. The results show that：the maximum axial airflow velocity inside the drill pipe decreases and stabilizes as the transport distance increases，while the maximum tangential velocity rapidly decays and vanishes. As rotational speed increases，the axial airflow velocity remains largely unchanged，but the tangential velocity significantly increases. With higher rotational speed，the spiral flow of coal particles becomes more pronounced，the length of the vortex region increases，and the length of the suspension region decreases. The number of coal particles entering the drill pipe decreases，and the distribution of particles above 5 m/s increases and becomes more dispersed. During rotation，the actual solid-to-gas ratio inside the drill pipe is lower than the set value，and coal particles transport efficiency increases and then decreases with the rise in rotational speed.

negative pressure sampling  /  drill pipe rotating speed  /  coal particles  /  flow characteristic  /  computational fluid dynamics(CFD)-discrete element method (DEM) coupling
Hongtu ZHANG, Zedong ZHEN, Botao LI, Ouya ZHANG. Study on influence of drill pipe rotation speed on coal particles-gas flow characteristics in negative pressure sampling process[J]. China Safety Science Journal, 2025 , 35 (4) : 94 -100 . DOI: 10.16265/j.cnki.issn1003-3033.2025.04.0998
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Year 2025 volume 35 Issue 4
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Article Info
doi: 10.16265/j.cnki.issn1003-3033.2025.04.0998
  • Receive Date：2024-12-15
  • Online Date：2025-07-05
  • Published：2025-04-28
Article Data
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History
  • Received：2024-12-15
  • Revised：2025-02-19
Funding
Affiliations
    1 School of Safety Science and Engineering，Henan Polytechnic University，Jiaozuo Henan 454003，China
    2 State Key Laboratory Cultivation Base for Gas Geology and Gas Control，Jiaozuo Henan 454003，China
    3 State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization，Henan Polytechnic University，Jiaozuo Henan 454003，China
    4 Art College，Xiangtan University，Xiangtan Hunan 411100，China
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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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