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Experimental and CFD Analysis of a Biplane Wells Turbine for Wave Energy Harnessing
KTH, School of Engineering Sciences (SCI), Mechanics.
2013 (English)Independent thesis Advanced level (degree of Master (Two Years)), 80 credits / 120 HE creditsStudent thesis
Abstract [en]

Several alternative ways of producing energy came up as the world took conscience of the finite availability of fossil fuels and the environmental consequences of its use and processing. Wave and tidal energy are among the so called green energies. Wave energy converters have been under research for the past two decades and yet there hasn’t been one technology that gathered everyone’s acceptance as being the most suitable one. The present work is focused on a self-rectifying turbine for wave energy harnessing. It’s a self-rectifying biplane Wells with an intermediate stator. The main goal is to evaluate the performance of such a turbine. Two different analyses were performed: experimental and computational. The experimental tests were made so that efficiency, velocity profiles and loss coefficients could be calculated. To do so scaled-down prototypes were built from scratch and tested experimentally. The 3D numerical analysis was possible by using a CFD commercial code: Fluent 6.3. Several simulations were performed for different flow coefficients. Three different degrees of mesh refinement were applied and k-ε turbulence model was the one chosen to simulate the viscous behavior of the flow through the turbine. A steady-state analysis is due and two mixing planes were used at the interfaces between the rotors and the stator. In the end comparisons are made between the experimental and numerical results

Place, publisher, year, edition, pages
Keyword [en]
Wells Turbine, Computational Fluid Dynamics, Experimental Analysis, Loss Coefficients, Efficiency, Rotor, Stator Guide Vanes, Wave Energy Converters, Oscillating Water Collumn
National Category
Fluid Mechanics and Acoustics
URN: urn:nbn:se:kth:diva-124070OAI: diva2:641449
Subject / course
Educational program
Master of Science - Engineering Mechanics
2013-06-11, Lisbon, 09:00 (English)
Available from: 2013-08-19 Created: 2013-06-25 Last updated: 2013-08-19Bibliographically approved

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