scholarly journals Wells Turbine for Wave Energy Conversion —Improvement of the Performance by Means of Impulse Turbine for Bi-Directional Flow

2013 ◽  
Vol 03 (02) ◽  
pp. 36-41 ◽  
Author(s):  
Shinya Okuhara ◽  
Manabu Takao ◽  
Akiyasu Takami ◽  
Toshiaki Setoguchi
Keyword(s):  
Energy Conversion ◽  
Wave Energy ◽  
Wave Energy Conversion ◽  
Wells Turbine ◽  
Impulse Turbine ◽  
Directional Flow

scholarly journals Air Turbines for Wave Energy Conversion

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
Manabu Takao ◽  
Toshiaki Setoguchi
Keyword(s):  
Energy Conversion ◽  
Wave Energy ◽  
Cross Flow ◽  
Wave Energy Conversion ◽  
Wells Turbine ◽  
Impulse Turbine ◽  
Sea Trial ◽  
Irregular Wave ◽  
Wave Conditions ◽  
Starting Characteristics

This paper describes the present status of the art on air turbines, which could be used for wave energy conversion. The air turbines included in the paper are as follows: Wells type turbines, impulse turbines, radial turbines, cross-flow turbine, and Savonius turbine. The overall performances of the turbines under irregular wave conditions, which typically occur in the sea, have been compared by numerical simulation and sea trial. As a result, under irregular wave conditions it is found that the running and starting characteristics of the impulse type turbines could be superior to those of the Wells turbine. Moreover, as the current challenge on turbine technology, the authors explain a twin-impulse turbine topology for wave energy conversion.

A Sea Trial of Wave Power Plant With Impulse Turbine

2008 ◽  
Author(s):  
Manabu Takao ◽  
Eiji Sato ◽  
Shuichi Nagata ◽  
Kazutaka Toyota ◽  
Toshiaki Setoguchi
Keyword(s):  
Power Plant ◽  
Energy Conversion ◽  
Wave Energy ◽  
Rotational Speed ◽  
Guide Vane ◽  
Wave Power ◽  
Wave Energy Conversion ◽  
Wells Turbine ◽  
Impulse Turbine ◽  
Sea Trial

A sea trial of wave power plant using an impulse turbine with coreless generator has been carried out at Niigata-nishi Port, in order to demonstrate usefulness of the turbine for wave energy conversion. Oscillating water column (OWC) based wave power plant has been installed at the side of a breakwater and has an air chamber with a sectional area of 4 m2 (= 2m × 2m). The impulse turbine used in the sea trial has fixed guide vanes both upstream and downstream, and these geometries are symmetrical with respect to the rotor centerline in order to rotate in a single direction in bi-directional airflow generated by OWC. The turbine is operated at lower rotational speed in comparison with conventional turbines. The rotor has a tip diameter of 458 mm, a hub-to-tip ratio of 0.7, a tip clearance of 1 mm, a chord length of 82.8 mm and a solidity of 2.0. The guide vane with chord length of 107.4 mm is symmetrically installed at the distance of 30.7 mm downstream and upstream of the rotor. The guide vane has a solidity of 2.27, a thickness ratio of 0.0279, a guide vane setting angle of 30° and a camber angle of 60°. The generator is coreless type and can generate electricity at lower rotational speed in comparison with conventional generator. The rated and maximum powers of the generator are 450 W and 880 W respectively. The experimental data obtained in the sea trial of wave power plant with the impulse turbine having coreless generator was compared to these of Wells turbine which is the mainstream of the turbine for wave energy conversion. As a result, total efficiency of the plant using the impulse turbine was higher than that of Wells turbine.

A modified Wells turbine for wave energy conversion

2003 ◽  
Vol 28 (1) ◽  
pp. 79-91 ◽  
Author(s):  
T. Setoguchi ◽  
S. Santhakumar ◽  
M. Takao ◽  
T.H. Kim ◽  
K. Kaneko
Keyword(s):  
Energy Conversion ◽  
Wave Energy ◽  
Wave Energy Conversion ◽  
Wells Turbine

Potential of performance improvement of a modified Wells turbine using passive control for wave energy conversion

2021 ◽  
Vol 242 ◽  
pp. 110178
Author(s):  
Ahmed T.M. Kotb ◽  
Mohamed A.A. Nawar ◽  
Rafea Abd El Maksoud ◽  
Youssef A. Attai ◽  
Mohamed H. Mohamed
Keyword(s):  
Energy Conversion ◽  
Performance Improvement ◽  
Wave Energy ◽  
Passive Control ◽  
Wave Energy Conversion ◽  
Wells Turbine

Performance investigation of Wells turbine for wave energy conversion with stall cylinders

2021 ◽  
Vol 241 ◽  
pp. 110052
Author(s):  
Kaihe Geng ◽  
Ce Yang ◽  
Chenxing Hu ◽  
Yanzhao Li ◽  
Xin Shi
Keyword(s):  
Energy Conversion ◽  
Wave Energy ◽  
Wave Energy Conversion ◽  
Wells Turbine
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