Computational and Experimental Analysis on Flow and Performance of Impulse Turbine for Wave Energy Conversion PDF Download
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Author: Thirumalisai Shanmugam Dhanasekaran
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Category :
Languages : en
Pages :
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Author: Thirumalisai Shanmugam Dhanasekaran
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Languages : en
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Author: Mohammed A. Salam Ali El-Hemry
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Category :
Languages : en
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Author: John Ryan
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Category :
Languages : en
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Author: Carlos Alberto Busto Velez
Publisher:
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Category : Computational fluid dynamics
Languages : en
Pages : 82
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Ocean energy research has grown in popularity in the past decade and has produced various designs for wave energy extraction. This thesis focuses on the performance analysis of a uni-directional impulse turbine for wave energy conversion. Uni-directional impulse turbines can produce uni-directional rotation in bi-directional flow, which makes it ideal for wave energy extraction as the motion of ocean waves are inherently bi-directional. This impulse turbine is currently in use in four of the world's Oscillating Wave Columns (OWC). Current research to date has documented the performance of the turbine but little research has been completed to understand the flow physics in the turbine channel. An analytical model and computational fluid dynamic simulations are used with reference to experimental results found in the literature to develop accurate models of the turbine performance. To carry out the numerical computations various turbulence models are employed and compared. The comparisons indicate that a low Reynolds number Yang-shih K-Epsilon turbulence model is the most computationally efficient while providing accurate results. Additionally, analyses of the losses in the turbine are isolated and documented. Results indicate that large separation regions occur on the turbine blades which drastically affect the torque created by the turbine, the location of flow separation is documented and compared among various flow regimes. The model and simulations show good agreement with the experimental results and the two proposed solutions enhance the performance of the turbine showing an approximate 10% increase in efficiency based on simulation results.
Author: Peter Ryan
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Category :
Languages : en
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Author: Paul Hickey
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Category :
Languages : en
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Languages : en
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Abstract: Impulse turbine is used in recent times as a self-rectifying turbine in OWC wave energy convertor. It has been found from field test data in Indian OWC plant that the profiles of air flow velocity is not symmetric in exhalation and reverse directions. The velocity is higher during the exhalation (chamber to atmosphere) than in the reverse direction. The modification proposed in this paper is to set the rotor blade pitch asymmetrically with a non-zero value of setting angle. It is expected to give a better performance in a wave cycle under the above air flow conditions. A 3D CFD model based on Fluent is validated by corresponding experimental data and is used for the numerical simulation of the turbine performance for different setting angles under steady conditions. All the calculations were carried out under the steady conditions. Pseudo-sinusoidal velocity pattern was used to represent the realistic air flows in the pilot plant. Quasi-steady analysis was then employed for calculating the mean efficiency for a certain variation of air flow velocity with time during a wave cycle. The clear flow separations were found at the suction side near the trailing edge and the high velocity domain occurs at the suction side near the midstream flow path. The pressure distribution show similar characteristics on both pressure and suction sides. Input coefficient, torque coefficient and mean efficiency are calculated for evaluating the turbine performance under various rotor blade setting angles. For the typical value of 0.6 for the ratio of velocity amplitude at inhalation to that at exhalation, the rotor blade setting angle of 5° was found to be optimum for the modified impulse turbine to achieve the best mean efficiency in a wave cycle. Highlights: A modified impulse turbine within rotor blade setting angle is proposed for asymmetrical air flow velocity amplitude conditions. Numerical model is set up based on Fluent and validated by corresponding experimental data. Flow field and pressure distribution around the rotor blade are illustrated. Mean efficiency in a wave cycle demonstrates that a 5° setting angle of rotor blade is optimum for the inhalation to exhalation velocity amplitude ratio 0.6.
Author: Joao Cruz
Publisher: Springer Science & Business Media
ISBN: 3540748954
Category : Technology & Engineering
Languages : en
Pages : 435
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The authors of this timely reference provide an updated and global view on ocean wave energy conversion – and they do so for wave energy developers as well as for students and professors. The book is orientated to the practical solutions that this new industry has found so far and the problems that any device needs to face. It describes the actual principles applied to machines that convert wave power to electricity and examines state-of-the-art modern systems.
Author: Charles Harindra De Soysa
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: Mark H. Fernelius
Publisher:
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Category : Electronic dissertations
Languages : en
Pages : 145
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Pressure gain combustion is a form of combustion that uses pressure waves to transfer energy and generate a rise in total pressure during the combustion process. Pressure gain combustion shows potential to increase the cycle efficiency of conventional gas turbine engines if used in place of the steady combustor. However, one of the challenges of integrating pressure gain combustion into a gas turbine engine is that a turbine driven by pulsing flow experiences a decrease in efficiency. The interaction of pressure pulses with a turbine was investigated to gain physical insights and to provide guidelines for designing turbines to be driven by pulsing flow.
