Title: A numerical analysis of casing groove parameters on the performance of wave energy conversion device

Authors: Paresh Halder; Francis Amal Varghese; Afzal Husain; Abdus Samad

Addresses: Department of Mechanical and Industrial Engineering, Sultan Qaboos University, Muscat, PC-123, Sultanate of Oman ' Wave Energy and Fluids Engineering Laboratory (WEFEL), Department of Ocean Engineering, IIT Madras, Chennai, 600036, India ' Department of Mechanical and Industrial Engineering, Sultan Qaboos University, Muscat, PC-123, Sultanate of Oman ' Wave Energy and Fluids Engineering Laboratory (WEFEL), Department of Ocean Engineering, IIT Madras, Chennai, 600036, India

Abstract: Casing grooves in Wells turbine can enhance its performance. The present computational work has been carried out to understand the effect of casing-groove's width-to-chord (w/C) ratio on the performance of a wave energy conversion device. In this study, four different values of w/C ratio such as 0.24, 0.48, 0.64 and 0.96 were investigated. The circumferential casing groove depth (3% of the chord length) and tip clearance (1% of the chord length) were kept constant for all the cases. The flow field was analysed through discretisation of three-dimensional steady incompressible Reynolds-averaged Navier-stokes (RANS) equations with two-equation eddy viscosity turbulence closer model. The simulation results show that the w/C ratio has a significant impact on the turbine performance and the w/C = 0.64 was found to be the optimal one among the several values investigated in the present study.

Keywords: casing groove; Wells turbine; wave energy conversion; CFD; reaction turbine.

DOI: 10.1504/IJAD.2018.094160

International Journal of Aerodynamics, 2018 Vol.6 No.2/3/4, pp.125 - 136

Received: 19 Jun 2017
Accepted: 26 Nov 2017
Published online: 20 Aug 2018 *

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