Hydraulic design aspects for supercritical flow in vortex drop shafts

Crispino, Gaetano (Department of Engineering, Unviersità della Campania Luigi Vanvitelli, Aversa, Italy) ; Gisonni, Corrado (Department of Engineering, Unviersità della Campania Luigi Vanvitelli, Aversa, Italy) ; Pfister, Michael (School of Engineering and Architecture (HEIA-FR), HES-SO // University of Applied Sciences Western Switzerland)

Vortex drop shafts, as special sewer manholes, operate optimally if an adequate energy dissipation is guaranteed and the integrity of the structural components is safeguarded. The results of an experimental study on a vortex drop shaft with supercritical inflow are discussed herein. The hydraulic behaviour of the spiral inlet, the vertical shaft and the dissipation chamber is described. Based on detailed flow observations, useful recommendations for designing these structures are provided. It is demonstrated that a relation adopted for supercritical bend flows provides a reliable estimation of the maximum wave height along the inlet. A procedure for predicting the rotational flow angles and the velocity distribution along vertical shafts with swirling flows is developed. Water levels and pressure measurements in the dissipation chamber are further analysed to identify maximum forces acting on the chamber invert and to derive preliminary design equations.


Keywords:
Article Type:
scientifique
Faculty:
Ingénierie et Architecture
School:
HEIA-FR
Institute:
iTEC - Institut des technologies de l'environnement construit
Date:
2019-07
Pagination:
10 p.
Published in:
Urban Water Journal
Numeration (vol. no.):
2019, vol. 16, no. 3, pp. 225-234
DOI:
ISSN:
1573-062X
Appears in Collection:

Note: The status of this file is: restricted


 Record created 2019-10-08, last modified 2019-10-08

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