Investigation on water and air characteristics in Helicoidal Ramp Dropshafts | Zendy

Shuangqing Zhang | Zendy; Hong Liu | Zendy; Jiachun Liu | Zendy

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Investigation on water and air characteristics in Helicoidal Ramp Dropshafts

Author(s) -

Shuangqing Zhang,

Hong Liu,

Jiachun Liu

Publication year - 2022

Publication title -

water science and technology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.406

H-Index - 137

eISSN - 1996-9732

pISSN - 0273-1223

DOI - 10.2166/wst.2022.056

Subject(s) - mechanics , volumetric flow rate , flow (mathematics) , airflow , drainage , water flow , environmental science , air water , atmospheric pressure , water pressure , materials science , environmental engineering , meteorology , engineering , mechanical engineering , physics , ecology , biology

Plunge dropshafts are widely used in urban drainage systems, but they can carry large amounts of air into the system, endangering the safety of the system. In this paper, a 3D numerical model is established to investigate the water flow configuration and air characteristics in a helicoidal ramp dropshaft. The simulations under different outlet pressures and water flow rates were simulated, and the results show that the air demand decreases with the increase of outlet pressure, especially in the case of low water flow. In the case of higher outlet pressure, the air demand first increases then decreases with the increase of the water flow rate. The dragging force of water has little effect on the pressure gradient in the dropshaft. The increase of ramp turns leads to the increase of terminal velocity at the same flow rate, and the air demand first increases and then decreases with the increase of ramp turns.

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