Hydraulic characteristics of stepped spillway dropshafts

Nowadays, “Sponge Cities” are being built to provide a valid solution to the glaring drainage problems in the urban areas of China. The hydraulics of a dropshaft, especially discharge capacity, energy dissipation and cavitation damage control, evidently affect its safety and the city’s underground t...

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Bibliographic Details
Published in:Science China. Technological sciences 2019-05, Vol.62 (5), p.868-874
Main Authors: Shen, JieYi, Wu, JianHua, Ma, Fei
Format: Article
Language:English
Subjects:
Air entrainment
Cavitation
Discharge
Energy dissipation
Engineering
Fluid dynamics
Fluid flow
Hydraulics
Urban areas
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Summary:Nowadays, “Sponge Cities” are being built to provide a valid solution to the glaring drainage problems in the urban areas of China. The hydraulics of a dropshaft, especially discharge capacity, energy dissipation and cavitation damage control, evidently affect its safety and the city’s underground tunnel system, due to the high dropshaft and large discharge. The hydraulic characteristics of stepped spillway dropshafts are experimentally investigated for the variable step rotation angles and end sill heights. Flow regimes inside the dropshafts are classified under the different approach flow discharges. The results illustrate that there is high energy dissipation in the present dropshafts with the stepped spillway and the cavitation damage could be effectively avoided thanks to the effect of the air entrainment to the flow.
ISSN:1674-7321
1869-1900
DOI:10.1007/s11431-018-9366-0