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.

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.

Experimental Study of a Radial Turbine Using Floating Nozzle for Wave Energy Conversion

2009 ◽  
Author(s):  
Toshio Konno ◽  
Yoshihiro Nagata ◽  
Manabu Takao ◽  
Toshiaki Setoguchi
Keyword(s):  
Energy Conversion ◽  
Steady Flow ◽  
Wave Energy ◽  
Flow Condition ◽  
Radial Flow ◽  
Guide Vane ◽  
Wave Energy Conversion ◽  
Wells Turbine ◽  
Radial Turbine ◽  
Steady Flow Condition

The objective of this study is to propose a new radial flow turbine for wave energy conversion and to clarify its performance by model testing under steady flow condition. The proposed radial turbine has a rotor blade row for unidirectional airflow and two guide vane rows. The guide vane rows are named ‘floating nozzle’ in the study. The guide vane rows slide in an axial direction and work as nozzle in the turbine alternately for bi-directional airflow, so as to rectify bidirectional airflow and to make uni-directional airflow. The radial flow turbine with a diameter of 500mm has been manufactured and investigated experimentally under steady flow condition generated by a wind tunnel using a piston/cylinder system with a diameter of 1.4m. As a result, it has been found in the study that the peak efficiency of the proposed radial turbine is approximately 57% and the rotational speed of this turbine is considerably lower that that of Wells turbine. Further, the effect of nozzle setting angle on the turbine performance was investigated and clarified in the study.

1204 An Impulse Turbine for Wave Energy Conversion : Effect of Guide Vane Thickness

2016 ◽  
Vol 2016.54 (0) ◽  
pp. _1204-1_-_1204-2_
Author(s):  
Haruka KATSUBE ◽  
M M Ashraful ALAM ◽  
Genya MASAKI ◽  
Shinya OKUHARA ◽  
Manabu TAKAO ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Wave Energy ◽  
Guide Vane ◽  
Wave Energy Conversion ◽  
Impulse Turbine

A Comparison of Biradial and Wells Air Turbines on the Mutriku Breakwater OWC Wave Power Plant

2017 ◽  
Author(s):  
J. C. C. Henriques ◽  
W. Sheng ◽  
A. F. O. Falcão ◽  
L. M. C. Gato
Keyword(s):  
Power Plant ◽  
Wave Energy ◽  
Time Domain ◽  
Guide Vane ◽  
Basque Country ◽  
Domain Model ◽  
Wave Power ◽  
Wells Turbine ◽  
Sharp Drop ◽  
Demonstration Site

The Mutriku breakwater wave power plant is located in the Bay of Biscay, in Basque Country, Spain. The plant is based on the oscillating water column (OWC) principle and comprises 16 air chambers, each of them equipped with a Wells turbine coupled to an electrical generator with a rated power of 18.5 kW. The IDMEC/IST Wave Energy Group is developing a novel self-rectifying biradial turbine that aims to overcome several limitations of the Wells turbine, namely the sharp drop in efficiency above a critical flow rate. The new turbine is symmetrical with respect to a mid-plane perpendicular to the axis of rotation. The rotor is surrounded by a pair of radial-flow guide vane rows. Each guide vane row is connected to the rotor by an axisymmetric duct whose walls are flat discs. In the framework of the “OPERA” European H2020 Project, the new biradial turbine will be tested at Mutriku and later will be installed and tested on a floating OWC wave energy converter — the OCEANTEC Marmok-5’s — to be deployed at BiMEP demonstration site in September of 2017. The aim of the present paper is to perform critical comparisons of the performance of the new biradial and the Wells turbine that is presently installed at Mutriku. This is based on results from a time-domain numerical model. For the purpose, a new hydrodynamic frequency domain model of the power plant was developed using the well know WAMIT software package. This was used to build a time-domain model based on the Cummins approach.

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