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Research Papers: Ocean Renewable Energy

Design and Optimization of a Ducted Marine Current Savonius Turbine for Gun-Barrel Passage, Fiji

[+] Author and Article Information
Jai Nendran Goundar

Division of Mechanical Engineering,
The University of the South Pacific,
Suva, Fiji
e-mail: goundar_j@usp.ac.fj

M. Rafiuddin Ahmed

Mem. ASME
Division of Mechanical Engineering,
The University of the South Pacific,
Suva, Fiji
e-mail: ahmed_r@usp.ac.fj

Young-Ho Lee

Division of Mechanical and Energy
System Engineering,
Korea Maritime and Ocean University,
Busan 49112, South Korea
e-mail: lyh@kmou.ac.kr

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received December 3, 2017; final manuscript received September 7, 2018; published online October 12, 2018. Assoc. Editor: Yi-Hsiang Yu.

J. Offshore Mech. Arct. Eng 141(2), 021901 (Oct 12, 2018) (8 pages) Paper No: OMAE-17-1210; doi: 10.1115/1.4041459 History: Received December 03, 2017; Revised September 07, 2018

Marine current energy is a reliable and clean source of energy. Many marine current turbines have been designed and developed over the years. Placement of an appropriately designed duct or shroud around the turbine significantly improves the turbine performance. In the present work, a ducted Savonius turbine (DST) is designed and optimized and its performance analysis carried out. The components of DSTs are simple and easily available and can be manufactured in developing countries like Fiji. A scaled-down model of 1/20 of a DST was fabricated and tested in a water stream at a velocity of 0.6 m/s and the results were used to validate the results from a commercial computational fluid dynamics (CFD) code ANSYS-cfx. Finally, a full-scale DST was modeled to study the flow characteristics in the turbine and the performance characteristics. The maximum efficiency of the turbine is around 50% at the tip speed ratio (TSR) of 3.5 and the maximum shaft power obtained is 10 kW at the rated speed of 1.15 m/s and around 65 kW at a freestream velocity of 2.15 m/s. The stress distribution on the ducted turbine was also obtained.

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Figures

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Fig. 1

A ducted Savonius turbine

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Fig. 2

Geometric details of augmentation channel (dimensions in mm)

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Fig. 3

Meshed Savonius rotor

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Fig. 4

Computational domain

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Fig. 5

Fabricated model of DST

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Fig. 6

Velocity vectors in XY plane for model without turbine

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Fig. 7

Comparison of CFD and experimental results

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Fig. 8

Power coefficient obtained experimentally and computationally

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Fig. 9

Velocity vectors in the rotor at two different blade positions

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Fig. 10

Turbine performance at different TSR and freestream velocities

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Fig. 11

Maximum power at different freestream velocities

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Fig. 12

Torque coefficient against TSR for different freestream velocities

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Fig. 13

Von-Mises stress distribution on the ducted turbine

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