Vertical Jet Generation during a sudden Flow Deceleration
Vertical Jet Generation during a sudden Flow Deceleration
During the emergency closure of a sluice gate at hydropower station inlets, or at the collision of a tsunami bore with a vertical wall, a sudden and complete deceleration of a moving water mass can occur. Experiments were conducted to model this sudden deceleration of a supercritical flow. It was observed that during such an event, a fast vertical jet can develop, with a vertical velocity of three times the horizontal velocity. A linearised theory was developed to describe the jet generation and characteristics. The theory employs the connected horizontal de- and vertical acceleration of a fluid body in contact with a vertical wall, governed by the requirement for conservation of energy and mass. The theory showed good agreement with the measurements, indicating its validity. With the theory, the additional pressures generated by the collision can be estimated.
Tsunami impact, Vertical uprush
Muller, Gerald
f1a988fc-3bde-429e-83e2-041e9792bfd9
Muller, Gerald
f1a988fc-3bde-429e-83e2-041e9792bfd9
Muller, Gerald
(2023)
Vertical Jet Generation during a sudden Flow Deceleration.
40th IAHR World Confress, , VIenna, Austria.
21 - 25 Aug 2023.
5 pp
.
Record type:
Conference or Workshop Item
(Paper)
Abstract
During the emergency closure of a sluice gate at hydropower station inlets, or at the collision of a tsunami bore with a vertical wall, a sudden and complete deceleration of a moving water mass can occur. Experiments were conducted to model this sudden deceleration of a supercritical flow. It was observed that during such an event, a fast vertical jet can develop, with a vertical velocity of three times the horizontal velocity. A linearised theory was developed to describe the jet generation and characteristics. The theory employs the connected horizontal de- and vertical acceleration of a fluid body in contact with a vertical wall, governed by the requirement for conservation of energy and mass. The theory showed good agreement with the measurements, indicating its validity. With the theory, the additional pressures generated by the collision can be estimated.
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Vertical Jet Generation during a sudden Flow Deceleration
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Accepted/In Press date: 30 June 2023
e-pub ahead of print date: 21 August 2023
Venue - Dates:
40th IAHR World Confress, , VIenna, Austria, 2023-08-21 - 2023-08-25
Keywords:
Tsunami impact, Vertical uprush
Identifiers
Local EPrints ID: 480516
URI: http://eprints.soton.ac.uk/id/eprint/480516
PURE UUID: d66ca67f-bf67-4591-b85a-2a18ae84aaca
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Date deposited: 03 Aug 2023 17:23
Last modified: 17 Mar 2024 03:52
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