Roller Characteristics of Preaerated High-Froude-Number Hydraulic Jumps
Publication: Journal of Hydraulic Engineering
Volume 147, Issue 4
Abstract
A hydraulic jump in a stilling basin at the base of spillway is typically characterized by preaerated inflow conditions. This paper presents an experimental study of high-Froude-number hydraulic jumps with different preaeration levels. Two characteristic lengths of the jump, namely the jump length and roller length, which are defined in various studies but sometimes not clearly distinguished, are obtained from the same flows by means of free-surface and air-water flow velocity measurements, respectively. The effects of changes in preaeration level are found to be opposite on the jump and roller lengths. Enhanced preaeration allows for a shorter length of the hydraulic jump, and the jump roller is elongated to achieve the same energy-dissipation rate in a shorter distance. The results imply a predominant effect of energy-dissipation enhancement over reductions associated with the extra air–water mixing and bubble–turbulence interplay. Tailwater wave characteristics are presented, showing similar frequencies for the far-field wave fluctuations and upstream jump toe oscillations on the two ends of the jump.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The second author thanks Professor Hubert Chanson (University of Queensland, Australia) for helpful discussion and Dr. Matthias Kramer (University of New South Wales, Australia) for sharing his code of the AWCC calculation. The research was supported by the National Natural Science Foundation of China (Grant Nos. 51909180, 51879177, and 51709293).
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Published In
Journal of Hydraulic Engineering
Volume 147 • Issue 4 • April 2021
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© 2021 American Society of Civil Engineers.
History
Received: May 26, 2020
Accepted: Oct 16, 2020
Published online: Jan 27, 2021
Published in print: Apr 1, 2021
Discussion open until: Jun 27, 2021
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