LAPSE:2023.21082
Published Article
LAPSE:2023.21082
Tip-Bed Velocity and Scour Depth of Horizontal-Axis Tidal Turbine with Consideration of Tip Clearance
March 21, 2023
Abstract
The scouring by a tidal turbine is investigated by using a joint theoretical and experimental approach in this work. The existence of a turbine obstructs a tidal flow to divert the flow passing through the narrow channel in between the blades and seabed. Flow suppression is the main cause behind inducing tidal turbine scouring, and its accelerated velocity is being termed as tip-bed velocity (Vtb). A theoretical equation is currently proposed to predict the tip-bed velocity based on the axial momentum theory and the conservation of mass. The proposed tip-bed velocity equation is a function of four variables of rotor radius (r), tip-bed clearance (C), efflux velocity (V0) and free flow velocity (V∞), and a constant of mass flow coefficient (Cm) of 0.25. An experimental apparatus was built to conduct the scour experiments. The results provide a better understanding of the scour mechanism of the horizontal axis tidal turbine-induced scour. The experimental results show that the scour depth is inversely proportional to tip-bed clearance. Turbine coefficient (Kt) is proposed based on the relationship between the tip-bed velocity and the experimental tidal turbine scour depth. Inclusion of turbine coefficient (Kt) into the existing pier scour equations can predict the maximum scour depth of a tidal turbine with an error range of 5−24%.
The scouring by a tidal turbine is investigated by using a joint theoretical and experimental approach in this work. The existence of a turbine obstructs a tidal flow to divert the flow passing through the narrow channel in between the blades and seabed. Flow suppression is the main cause behind inducing tidal turbine scouring, and its accelerated velocity is being termed as tip-bed velocity (Vtb). A theoretical equation is currently proposed to predict the tip-bed velocity based on the axial momentum theory and the conservation of mass. The proposed tip-bed velocity equation is a function of four variables of rotor radius (r), tip-bed clearance (C), efflux velocity (V0) and free flow velocity (V∞), and a constant of mass flow coefficient (Cm) of 0.25. An experimental apparatus was built to conduct the scour experiments. The results provide a better understanding of the scour mechanism of the horizontal axis tidal turbine-induced scour. The experimental results show that the scour depth is inversely proportional to tip-bed clearance. Turbine coefficient (Kt) is proposed based on the relationship between the tip-bed velocity and the experimental tidal turbine scour depth. Inclusion of turbine coefficient (Kt) into the existing pier scour equations can predict the maximum scour depth of a tidal turbine with an error range of 5−24%.
Record ID
Keywords
marine renewable energy, tidal power, tidal turbine-induced scour, turbine wake
Subject
Suggested Citation
Zhang T, Lam WH, Cui Y, Jiang J, Sun C, Guo J, Ma Y, Wang S, Lam SS, Hamill G. Tip-Bed Velocity and Scour Depth of Horizontal-Axis Tidal Turbine with Consideration of Tip Clearance. (2023). LAPSE:2023.21082
Author Affiliations
Zhang T: State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300350, China; First R&D Services, A-08-16 M Suites, 283 Jalan Ampang, 50450 Kuala Lumpur, Malaysia
Lam WH: State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300350, China; First R&D Services, A-08-16 M Suites, 283 Jalan Ampang, 50450 Kuala Lumpur, Malaysia [ORCID]
Cui Y: State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300350, China; First R&D Services, A-08-16 M Suites, 283 Jalan Ampang, 50450 Kuala Lumpur, Malaysia
Jiang J: State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300350, China; First R&D Services, A-08-16 M Suites, 283 Jalan Ampang, 50450 Kuala Lumpur, Malaysia
Sun C: State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300350, China; First R&D Services, A-08-16 M Suites, 283 Jalan Ampang, 50450 Kuala Lumpur, Malaysia
Guo J: State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300350, China; First R&D Services, A-08-16 M Suites, 283 Jalan Ampang, 50450 Kuala Lumpur, Malaysia
Ma Y: State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300350, China; First R&D Services, A-08-16 M Suites, 283 Jalan Ampang, 50450 Kuala Lumpur, Malaysia
Wang S: State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300350, China; First R&D Services, A-08-16 M Suites, 283 Jalan Ampang, 50450 Kuala Lumpur, Malaysia
Lam SS: Pyrolysis Technology Research Group, School of Ocean Engineering, Universiti Malaysia Terengganu, 21030 Kuala Nerus, Terengganu, Malaysia
Hamill G: School of Natural and Built Environment, Architecture, Civil & Structural Engineering and Planning, Queen’s University Belfast, David Keir Building, Stranmillis Road, Belfast BT9 5AG, UK
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Lam WH: State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300350, China; First R&D Services, A-08-16 M Suites, 283 Jalan Ampang, 50450 Kuala Lumpur, Malaysia [ORCID]
Cui Y: State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300350, China; First R&D Services, A-08-16 M Suites, 283 Jalan Ampang, 50450 Kuala Lumpur, Malaysia
Jiang J: State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300350, China; First R&D Services, A-08-16 M Suites, 283 Jalan Ampang, 50450 Kuala Lumpur, Malaysia
Sun C: State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300350, China; First R&D Services, A-08-16 M Suites, 283 Jalan Ampang, 50450 Kuala Lumpur, Malaysia
Guo J: State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300350, China; First R&D Services, A-08-16 M Suites, 283 Jalan Ampang, 50450 Kuala Lumpur, Malaysia
Ma Y: State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300350, China; First R&D Services, A-08-16 M Suites, 283 Jalan Ampang, 50450 Kuala Lumpur, Malaysia
Wang S: State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300350, China; First R&D Services, A-08-16 M Suites, 283 Jalan Ampang, 50450 Kuala Lumpur, Malaysia
Lam SS: Pyrolysis Technology Research Group, School of Ocean Engineering, Universiti Malaysia Terengganu, 21030 Kuala Nerus, Terengganu, Malaysia
Hamill G: School of Natural and Built Environment, Architecture, Civil & Structural Engineering and Planning, Queen’s University Belfast, David Keir Building, Stranmillis Road, Belfast BT9 5AG, UK
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Journal Name
Energies
Volume
12
Issue
12
Article Number
E2450
Year
2019
Publication Date
2019-06-25
ISSN
1996-1073
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PII: en12122450, Publication Type: Journal Article
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LAPSE:2023.21082
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https://doi.org/10.3390/en12122450
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Mar 21, 2023
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