Fluid Analysis of Impeller Wheel Wave Energy Detector System

2012 ◽  
Vol 503-504 ◽  
pp. 743-747
Author(s):  
Shi Ming Wang ◽  
Fu Xi Zhang
Keyword(s):  
Wave Energy ◽  
Cfd Simulation ◽  
Clean Energy ◽  
Detector System ◽  
Energy Detector ◽  
Detector Efficiency ◽  
Relevant Research ◽  
Fluid Analysis ◽  
The Way

Wave energy is a sort of clean energy existing in ocean with mass of storage, and the way how to observe, detect and measure is the very first step of exploring wave energy and other purpose. Shanghai Ocean University has focused this field for long, and proposed a kind of impeller wheel wave energy detector system which is based on buoy or other small offshore equipments. To make the wave energy detector efficiency and precise, some analysis is very necessary especially the fluid analysis. With the analysis results some optimizations for structure and combination of the impeller wheel are chosen to accomplish design target. And the method of CFD simulation and theory will be a reference for relevant research.

scholarly journals Computational fluid dynamics (CFD) simulation analysis on retinal gas cover rates using computational eye models

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Makoto Gozawa ◽  
Yoshihiro Takamura ◽  
Tomoe Aoki ◽  
Kentaro Iwasaki ◽  
Masaru Inatani
Keyword(s):  
Cfd Simulation ◽  
Simulation Analysis ◽  
Fluid Dynamic ◽  
Fluid Analysis ◽  
Intraocular Gas ◽  
Pars Plana ◽  
Computational Fluid Dynamics Cfd ◽  
Multiple Breaks ◽  
Gas Volume ◽  
Wall Wettability

AbstractWe investigated the change in the retinal gas cover rates due to intraocular gas volume and positions using computational eye models and demonstrated the appropriate position after pars plana vitrectomy (PPV) with gas tamponade for rhegmatogenous retinal detachments (RRDs). Computational fluid dynamic (CFD) software was used to calculate the retinal wall wettability of a computational pseudophakic eye models using fluid analysis. The model utilized different gas volumes from 10 to 90%, in increments of 10% to the vitreous cavity in the supine, sitting, lateral, prone with closed eyes, and prone positions. Then, the gas cover rates of the retina were measured in each quadrant. When breaks are limited to the inferior retina anterior to the equator or multiple breaks are observed in two or more quadrants anterior to the equator, supine position maintained 100% gas cover rates in all breaks for the longest duration compared with other positions. When breaks are limited to either superior, nasal, or temporal retina, sitting, lower temporal, and lower nasal position were maintained at 100% gas cover rates for the longest duration, respectively. Our results may contribute to better surgical outcomes of RRDs and a reduction in the duration of the postoperative prone position.

scholarly journals Energy Production Benefits by Wind and Wave Energies for the Autonomous System of Crete

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2741 ◽  
Author(s):  
George Lavidas ◽  
Vengatesan Venugopal
Keyword(s):  
Wind Turbine ◽  
Wave Energy ◽  
Energy Production ◽  
Large Scale ◽  
Capital Expenditure ◽  
Temporal Correlation ◽  
Clean Energy ◽  
Limiting Factor ◽  
Spatio Temporal ◽  
Visual Impacts

At autonomous electricity grids Renewable Energy (RE) contributes significantly to energy production. Offshore resources benefit from higher energy density, smaller visual impacts, and higher availability levels. Offshore locations at the West of Crete obtain wind availability ≈80%, combining this with the installation potential for large scale modern wind turbines (rated power) then expected annual benefits are immense. Temporal variability of production is a limiting factor for wider adaptation of large offshore farms. To this end multi-generation with wave energy can alleviate issues of non-generation for wind. Spatio-temporal correlation of wind and wave energy production exhibit that wind and wave hybrid stations can contribute significant amounts of clean energy, while at the same time reducing spatial constrains and public acceptance issues. Offshore technologies can be combined as co-located or not, altering contribution profiles of wave energy to non-operating wind turbine production. In this study a co-located option contributes up to 626 h per annum, while a non co-located solution is found to complement over 4000 h of a non-operative wind turbine. Findings indicate the opportunities associated not only in terms of capital expenditure reduction, but also in the ever important issue of renewable variability and grid stability.

scholarly journals Keterlibatan Warga Negara (Civic Engagement) dalam Penguatan Karakter Peduli Lingkungan

2018 ◽  
Vol 9 (1) ◽  
pp. 105-117
Author(s):  
Setiawan Gusmadi
Keyword(s):  
Civic Engagement ◽  
Development Strategy ◽  
Relevant Research ◽  
Environmental Care ◽  
The Development Strategy ◽  
The Future ◽  
The Way

This paper aims to explore deeply about civic engagement in strengthening environmental cares. Civic engagement refers to the way citizens participate in the life of a community to improve the condition of others or to help shape the future of society. The writing of this paper is supported by literature studies and relevant research journals in the form of national journals and international journals. Civic engagement is expected to strengthen the character of environmental care clean, healthy, comfortable, and cultured environment. Movement to improve the environment of a more effective society must be supported in terms of education that develops responsible, creative and knowledgeable society. Civic engagement becomes important to contribute in a community that moves to manage, preserve and preserve the environment such as the development strategy of the Mangrove Center Foundation.

Design and Hydrodynamic Performance Testing of One-Base Multi-Buoy Floating Sharp Eagle Wave Energy Converter

2015 ◽  
Vol 1092-1093 ◽  
pp. 152-157
Author(s):  
Zhen Peng Wang ◽  
Ya Ge You ◽  
Ya Qun Zhang ◽  
Song Wei Sheng ◽  
Hong Jun Lin
Keyword(s):  
Wave Energy ◽  
High Efficiency ◽  
Performance Testing ◽  
Clean Energy ◽  
Wave Energy Converter ◽  
Hydrodynamic Performance ◽  
Wave Direction ◽  
Energy Converter ◽  
Working Principle ◽  
Period Wave

Research on wave energy extraction has been conducted in many countries to meet the growing demand for clean energy. To find an efficient and economic way to convert wave energy, an one-base multi-buoy offshore floating Sharp Eagle wave energy converter is designed, consisting of four Eagle head absorbing buoys, one semi-submersible barge, one energy conversion system, buoyancy tanks, underwater appendages and other components. The working principle of the device is described in this paper. To test the hydrodynamic performance of device and make an initial evaluation for the design, a model experiment of 1/13.78th scale was carried out. The influence of wave period, wave height, pressure in hydrocylinders and wave direction is tested. All the efficiencies in different conditions are compared with each other, while the high efficiency and stability of device are verified.

scholarly journals A Survey of Power Take-off Systems of Ocean Wave Energy Converters

2019 ◽  
Author(s):  
Zhenwei Liu ◽  
Ran Zhang ◽  
Han Xiao ◽  
Xu Wang
Keyword(s):  
Energy Conversion ◽  
Wave Energy ◽  
Clean Energy ◽  
Ocean Wave ◽  
Direct Drive ◽  
Wave Energy Conversion ◽  
Drive Power ◽  
Wave Energy Converters ◽  
Ocean Wave Energy ◽  
Energy Converters

Ocean wave energy conversion as one of the renewable clean energy sources is attracting the research interests of many people. This review introduces different types of power take-off technology of wave energy converters. The main focus is the linear direct drive power take-off devices as they have the advantages for ocean wave energy conversion. The designs and optimizations of power take-off systems of ocean wave energy converters have been studied from reviewing the recently published literature. Also, the simple hydrodynamics of wave energy converters have been reviewed for design optimization of the wave energy converters at specific wave sites. The novel mechanical designs of the power take-off systems have been compared and investigated in order to increase the energy harvesting efficiency.

A New Flapping-Hydrofoil Wave Power Generating Unmanned Ocean Vehicle

2016 ◽  
Author(s):  
Tao Sun ◽  
Jiangbin Zhao ◽  
Xinping Yan ◽  
Pengpeng Xu
Keyword(s):  
Wave Energy ◽  
Energy Harvester ◽  
Clean Energy ◽  
Sea Surface ◽  
Ocean Wave ◽  
Wave Power ◽  
Ocean Science ◽  
Ocean Wave Energy ◽  
Offshore Engineering ◽  
Further Development

To solve the issue of the energy supply for unmanned ocean vehicles, the ocean wave energy as an abundant and widely distributed renewable clean energy, provides a feasible way. This paper proposes a flapping-hydrofoil method applied to unmanned ocean vehicles, harnessing the ocean wave energy to generate power. The structure of the flapping-hydrofoil wave energy harvester is presented, including the internal transmission device and the design of the hydrofoil. Then the operation modes (buoyancy drive and electric drive) and the application prospects (operating on and under the sea surface) of the flapping-hydrofoil wave energy ocean vehicle are also discussed, with the sincere expectations of further development of the ocean science and technology as well as offshore engineering.

scholarly journals Development of Green Ports with the Consideration of Coastal Wave Energy

2018 ◽  
Vol 10 (11) ◽  
pp. 4270 ◽  
Author(s):  
Li Li ◽  
Jiadong Zhu ◽  
Guanqiong Ye ◽  
Xuehao Feng
Keyword(s):  
Wave Energy ◽  
Energy Supply ◽  
Rapid Development ◽  
Clean Energy ◽  
Maritime Logistics ◽  
The Sustainable Development ◽  
Optimal Decisions ◽  
Wave Energy Converters ◽  
Reduction Of Energy Consumption ◽  
Theoretical Analyses

Considering the rapid development of maritime logistics, the reduction of energy consumption at ports is important in the sustainable development of global economics. Oceans have been known as sources of clean energy, and wave energy is attracting more and more attention from both scholars and practitioners. Even though much effort has been made to develop advanced technologies of wave energy, it is still not clear how ports and electricity plants will evaluate its performance and make decisions on the investment. This paper analyzed the decision framework of ports and electricity plants that can decide how much to invest into wave energy converters, by considering the uncertainty of wave energy supply. A mathematical model is developed to obtain the optimal decisions of a single port and electricity plant for different cases. We show that in most cases, the port has a no lower motivation for investing in the wave energy than the electricity plant. Our theoretical analyses also shed light on the impacts of the parameters on the optimal decisions. Considering the difficulty in estimating the uncertainty of wave energy supply, we extend the distribution-free model to our problem which can make our model more practical.

scholarly journals Optimization of an Invention Based on a Force Multiplier Mechanism for Wave Power Generation

2014 ◽  
Vol 507 ◽  
pp. 480-485
Author(s):  
Javier Aparisi ◽  
Jose González ◽  
Bernabé Hernandis
Keyword(s):  
Power Generation ◽  
Wave Height ◽  
Wave Energy ◽  
Fossil Fuels ◽  
Clean Energy ◽  
Wave Energy Converter ◽  
Wave Power ◽  
Rectilinear Motion ◽  
Energy Converter ◽  
The Waves

The development and exploitation of new sources of clean energy that do not depend on traditional sources based on the use of fossil fuels, is the focus of this research, which starts with the optimization of an invention capable of transforming a reciprocating rectilinear motion into continuous circular motion in a very efficient way, to be used in the development of a Wave Energy Converter (WEC), capable of operating with low wave height and taking advantage of the oscillating movement of the waves both when rising, and when lowering, unlike other similar devices that harness it only in one way.

tCO2e—a new pricing model for LNG?

2020 ◽  
Vol 13 (1) ◽  
pp. 83-87
Author(s):  
Peter Roberts
Keyword(s):  
Natural Gas ◽  
Crude Oil ◽  
Oil Prices ◽  
Clean Energy ◽  
Liquefied Natural Gas ◽  
Pricing Model ◽  
Crude Oil Prices ◽  
Value Measure ◽  
The Way

Abstract The concept of commercializing natural gas through liquefaction to give liquefied natural gas (LNG), with the capacity for that LNG to be shipped worldwide to meet the demand for clean energy, is well known. The options for, and the opportunities for evolution in, how LNG is priced (whether locally, regionally or even globally, with indexation to crude oil prices or to reported gas hub prices) have also been widely discussed in industry literature. But into the LNG pricing mix, we could soon be adding a new value measure which could have the capacity to shape the way in which LNG production projects are configured—tCO2e (or, to give it its full name, tCO2e/tLNG).

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