Flow condition identification and discharge calibration for submerged radial gates

Accurate prediction of the discharge through radial gates is difficult. Existing calibration methods typically provide sufficient accuracy for free flows and submerged flows with jet Froude number at vena contracta larger than 1.7. However, their predictions are poor for submerged flows with jet Fro...

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Bibliographic Details
Published inJournal of hydraulic research Vol. 59; no. 4; pp. 683 - 690
Main Authors Guo, Yong-Xin, Guo, Xin-Lei, Wang, Yi-Sen, Wang, Tao, Fu, Hui, Li, Jia-Zhen
Format Journal Article
LanguageEnglish
French
Published Madrid Taylor & Francis 04.07.2021
Taylor & Francis Ltd
Subjects
Calibration
Discharge
Discharge coefficient
discharge measurement
Empirical analysis
flow condition
Free flow
Froude number
Hydraulic jump
Identification
Identification methods
Predictions
radial gate
Radial gates
Reclamation
Submerged flow
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Summary:Accurate prediction of the discharge through radial gates is difficult. Existing calibration methods typically provide sufficient accuracy for free flows and submerged flows with jet Froude number at vena contracta larger than 1.7. However, their predictions are poor for submerged flows with jet Froude number less than 1.7. Based on the analysis of experimental data collected by the US Bureau of Reclamation, an empirical indicator was proposed to predict the approximate range of jet Froude number for submerged flows. Accordingly, submerged flows were subdivided into partially submerged flows with fully developed hydraulic jump, and totally submerged flows with undular or no jump. A new discharge calibration method, referred to as the identification method, was developed for the three distinct flow conditions. Verification of the proposed method indicated the discharge prediction accuracies were significantly improved for totally submerged flows.
ISSN:0022-1686
1814-2079
DOI:10.1080/00221686.2020.1818305