The open sea tests of the offshore floating type wave power device "Mighty Whale" -characteristics of wave energy absorption and power generation

2002 ◽  
Author(s):  
Y. Washio ◽  
H. Osawa ◽  
T. Ogata
Keyword(s):  
Power Generation ◽  
Energy Absorption ◽  
Wave Energy ◽  
Power Device ◽  
Wave Power ◽  
Type Wave ◽  
Open Sea ◽  
Floating Type

The Open Sea Tests of the Offshore Floating Type Wave Power Device “Mighty Whale”: Performance of the Prototype

2002 ◽  
Author(s):  
Teruhisa Ogata ◽  
Yukihisa Washio ◽  
Hiroyuki Osawa ◽  
Yasushi Tsuritani ◽  
Seiya Yamashita ◽  
...  
Keyword(s):  
Wave Height ◽  
Wave Energy ◽  
Wave Period ◽  
Power Device ◽  
Design Stage ◽  
Wave Power ◽  
Significant Wave ◽  
Type Wave ◽  
Open Sea ◽  
Floating Type

This paper presents the characteristics of wave conditions, wave energy absorption, response of hull-motion and wave height dissipation based on the results of the open sea tests. 0.5–1.0m of significant wave height and 6–7 seconds of significant wave period appear the most predominant, and average wave energy is estimated 4.88kW/m around the test site. Average power output for the test is approximately 6kWh and the maximum total energy efficiency is around 15% that is ranging from 6–7 seconds of significant wave period. Slow drift oscillation of hull was observed motion in surge, sway and yaw and the value of its amplitude almost equal to estimated values in design stage. Then the mean value of transmission coefficient is about 0.8 under 8.0 seconds of significant wave period. We are considering that the results of the tests should be useful for optimum design of an offshore floating type wave power device.

Characteristics of Hydrodynamics and Generating Output of the Offshore Floating Wave Energy Device “Mighty Whale”

2013 ◽  
Vol 135 (1) ◽  
Author(s):  
Hiroyuki Osawa ◽  
Tsuyoshi Miyazaki ◽  
Shogo Miyajima
Keyword(s):  
Energy Absorption ◽  
Output Power ◽  
Wave Energy ◽  
Power Device ◽  
Hydrodynamic Characteristics ◽  
Wave Power ◽  
Water Tank ◽  
Power Devices ◽  
Turbine Generator ◽  
Generator System

In this paper, a new numerical calculation method is presented; it was developed for the analysis of the hydrodynamic characteristics of a floating, oscillating water column (OWC) type wave power device. The method is examined by comparing results calculated with the method with results of water tank experiments. The examination was concerned with the determination of hydrodynamic coefficients, characteristics of air pressure and water level in an air chamber, and characteristics of hull motion and wave energy absorption. The calculated results agreed with the results of water tank tests; the method presented adequately estimated the hydrodynamic characteristics of the floating OWC type wave power device, including the wave energy absorption effects. An estimation method is presented for the output power of a turbine-generator system. The method was developed for the design of the “Mighty Whale” turbine-generator system. Moreover, the method was assessed by comparing predictions with open sea test results. The mean value of the output power was estimated reasonably well. In conclusion, the estimation methods presented are useful for the design of floating OWC wave power devices. Such tools are useful for the designer interested in developing optimal wave power devices.

scholarly journals A Fundamental Study on Wave Energy Absorption Performance of the OWC Type Wave Power Absorbing buoy

2014 ◽  
Vol 131 (0) ◽  
pp. 113-118
Author(s):  
Mitsuhiro MASUDA ◽  
Shin IBARAKI ◽  
Kiyokazu MINAMI ◽  
Yutaro SASAHARA
Keyword(s):  
Energy Absorption ◽  
Wave Energy ◽  
Wave Power ◽  
Fundamental Study ◽  
Type Wave ◽  
Absorption Performance

Characteristics of Hydrodynamics and Generating Output of Offshore Floating Wave Energy Device “Mighty Whale”

2004 ◽  
Author(s):  
Hiroyuki Osawa ◽  
Tsuyoshi Miyazaki ◽  
Shogo Miyajima
Keyword(s):  
Wave Energy ◽  
Wave Power ◽  
Hydrodynamic Behavior ◽  
Extraction Technology ◽  
Energy Device ◽  
Technology Center ◽  
Ocean Wave Energy ◽  
Open Sea ◽  
Theoretical Investigations ◽  
Floating Type

Japan Marine Science and Technology Center (JAMSTEC) has been engaged in research and development of ocean-wave energy extraction technology for many years now. In particular, work began in 1987 an offshore floating type wave power device called “Mighty Whale”. Theoretical investigations and model tests led to an understanding of the hydrodynamic behavior of device, and provided information of constructing for the prototype of Mighty Whale. The open sea tests were started on the 10th of September 1998. Tests were conducted until March 2002. In this paper, firstly, the characteristics of hydrodynamics with “Mighty Whale” have been examined comparing with the results of experiments and calculations approving a numerical method being developed. Secondly, using developed numerical analyze method, the displacements of water level inside air chambers of “Mighty Whale” have been calculated. The generating outputs of “Mighty Whale” have been estimated using these results, the efficiency of primary conversion and the efficiency of secondary conversion of “Mighty Whale” getting through the experiments that had been carried out.

scholarly journals A Study on Characteristics of Generated Output of the Offshore Floating Type Wave Power Device “Mighty Whale”

2001 ◽  
Vol 2001 (190) ◽  
pp. 395-405 ◽  
Author(s):  
Washio Yukihisa ◽  
Osawa Hiroyuki ◽  
Ogata Teruhisa ◽  
Nakagawa Hiroyuki ◽  
Okayama Shuzou ◽  
...  
Keyword(s):  
Power Device ◽  
Wave Power ◽  
Type Wave ◽  
Floating Type

Design of 3D Modeling for the Floating Wave Power Generation Device and Test

2013 ◽  
Vol 718-720 ◽  
pp. 1603-1608
Author(s):  
Shi Ming Wang ◽  
Ya Nan Wang ◽  
Li Na Ma
Keyword(s):  
Power Generation ◽  
Wave Energy ◽  
3D Modeling ◽  
Mechanical Energy ◽  
Electric Energy ◽  
Structure Design ◽  
Power Device ◽  
Wave Power ◽  
Ocean Wave Energy ◽  
Power Generation Device

Ocean wave energy is one kind of potential renewable energy, and the devices of using wave energy generate power are varied. This paper put forward a new method of using wave turbine to absorb wave energy, then output mechanical energy through mechanical drivers to generator, finally convert to electric energy by generator directly. Generally, structure design of the wave-wing is very important to the device. It is the important component of the device for absorbing wave energy. For this study, we designed the 3D modeling of the floating wave power device through SolidWorks software, and produced the wave turbine on proportion of 1:1. We had tested the wave turbine in the pool of the laboratory and obtain the torque and power under certain conditions.

The backward bend duct buoy-an improved floating type wave power device

2003 ◽  
Author(s):  
Y. Masuda ◽  
T. Yamazaki ◽  
Y. Outa ◽  
M.E. McCormick
Keyword(s):  
Power Device ◽  
Wave Power ◽  
Type Wave ◽  
Floating Type

scholarly journals Wave-PV Hybrid Generation System of the Offshore Floating Type Wave Power Device “Mighty Whale”

2003 ◽  
Vol 2003 (194) ◽  
pp. 247-254
Author(s):  
Hiroyuki Osawa ◽  
Tsuyoshi Miyazaki ◽  
Teruhisa Ogata ◽  
Takayuki Takeuchi ◽  
Shuzo Okayama
Keyword(s):  
Power Device ◽  
Wave Power ◽  
Generation System ◽  
Hybrid Generation ◽  
Type Wave ◽  
Floating Type

scholarly journals Analysis of waste heat utilization of ship main engine

2020 ◽  
Vol 165 ◽  
pp. 06027
Author(s):  
Jin Zhemin ◽  
Yang Yuxin
Keyword(s):  
Power Generation ◽  
Steam Turbine ◽  
Wave Energy ◽  
Electricity Generation ◽  
Waste Heat ◽  
Wave Power ◽  
Heat Utilization ◽  
Waste Heat Utilization ◽  
Reduce Emissions ◽  
Main Engine

In order to protect the environment, save energy and reduce emissions, and promote the utilization of wave energy, this paper reviews the development history of application generation technology, summarizes its development from two aspects of optimization and application of wave energy conversion devices, analyses the application examples of wave energy generation devices on ships. This paper summarizes the application trend of wave power generation devices on ships: wave power generation should be used as auxiliary and domestic electricity for ships and wave energy should be combined with other new energy sources. Wave energy application in marine power generation can effectively reduce emissions from ships, which is conducive to the sustainable development of human society. The system mainly included low speed marine main diesel engine, waste heat boiler, electricity generation sub-system of power turbine, electricity generation sub-system of steam turbine, the heat exchange equipment, electricity generation sub-system of organic working medium steam turbine and other equipments. Based on experimental data of main engine and later theoretical calculation, this paper studied the effect rules of electricity generation power, waste heat utilization potential and related parameters of the waste heat utilization system under different main diesel load and ambient temperature.

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