Marine current energy is a clean energy source and is a solution to the problems faced by burning fossil fuels such as global warming and climate change. Once tapped, the useful shaft power can be converted into electrical energy. To make this practical, the designed energy converter should be capable of operating at low marine current velocities, it should be suitable for installation at locations that have low water depths and should have lower manufacturing, installation and maintenance costs. A ducted cross-flow turbine has all the above features and it will be suitable for Pacific Island countries (PICs) for extracting marine current energy. The ducted cross-flow turbine was designed, modelled and analyzed in commercial Computational Fluid dynamic (CFD) code ANSYS-CFX. The inlet and outlet duct sizes were optimized for maximum output. Before the analysis of full model, the CFD results were validated with experimental results. Simulations for the 1:10 ducted cross-flow turbine (having a diameter of 150 mm) were performed with 400,000 nodes, as increase in the grid size did not make much difference other than increasing the simulation time significantly. The maximum difference in the power coefficient between CFD and experimental results was 6%. Simulations were then performed for the full-scale prototype, which has a duct (nozzle) inlet of 3.5 m × 3.5 m and a turbine diameter of 1.5 m, at three freestream velocities of 0.65 m/s, 1.95 m/s and 3.25 m/s. Analysis of the prototype performance showed that the ducted cross-flow turbine can reach a maximum efficiency of 56% and can produce 21.5 kW of power at a current speed of 1.95 m/s and 103.6 kW at 3.25 m/s. The designed cut-off speed was 4 m/s.
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ASME 2018 International Mechanical Engineering Congress and Exposition
November 9–15, 2018
Pittsburgh, Pennsylvania, USA
Conference Sponsors:
- ASME
ISBN:
978-0-7918-5207-1
PROCEEDINGS PAPER
Design of a Ducted Cross-Flow Turbine for Marine Current Energy Extraction
Jai N. Goundar,
Jai N. Goundar
University of the South Pacific, Suva, Fiji
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Deepak D. Prasad,
Deepak D. Prasad
University of the South Pacific, Suva, Fiji
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Mohammed Rafiuddin Ahmed
Mohammed Rafiuddin Ahmed
University of the South Pacific, Suva, Fiji
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Jai N. Goundar
University of the South Pacific, Suva, Fiji
Deepak D. Prasad
University of the South Pacific, Suva, Fiji
Mohammed Rafiuddin Ahmed
University of the South Pacific, Suva, Fiji
Paper No:
IMECE2018-87324, V06AT08A016; 7 pages
Published Online:
January 15, 2019
Citation
Goundar, JN, Prasad, DD, & Ahmed, MR. "Design of a Ducted Cross-Flow Turbine for Marine Current Energy Extraction." Proceedings of the ASME 2018 International Mechanical Engineering Congress and Exposition. Volume 6A: Energy. Pittsburgh, Pennsylvania, USA. November 9–15, 2018. V06AT08A016. ASME. https://doi.org/10.1115/IMECE2018-87324
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