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A radial inflow air turbine design for a vented oscillating water column

Citation

Ansarifard, N and Kianejadtejenaki, S and Fleming, A and Chai, S, A radial inflow air turbine design for a vented oscillating water column, Energy, 166 pp. 380-391. ISSN 0360-5442 (2019) [Refereed Article]

Copyright Statement

Copyright 2018 Elsevier Ltd.

DOI: doi:10.1016/j.energy.2018.10.068

Abstract

The oscillating-water-column (OWC) is a ubiquitous style of wave-energy-converter for harnessing significant power from ocean waves. A new configuration of OWC described here as a vented-OWC provides opportunity to simplify air-turbine design by limiting the power extraction to inhalation mode. The asymmetric airflow profile of the vented-OWC requires a unidirectional-turbine configuration to be adopted.

The focus of this study is to analyse a unidirectional radial air-inflow-turbine design using Computational-Fluid-Dynamics (CFD) suitable for application with a vented-OWC. It is found that downstream of the rotor can cause significant energy losses due to its narrow flow passage. Two configurations of an inward-flow radial turbine were also compared, the first by keeping the casing height constant throughout the turbine domain and the second by increasing the casing height in a way to keep a constant sectional area from inlet to the outlet of the turbine domain. The latter configuration obtained a ten percent gain in peak efficiency compared to the first. The difference is identified as fewer energy losses at the downstream section and comparably higher torque for the same flow-coefficient. Introduction of downstream-guide-vanes was found to retard the chocking phenomenon, which offers a wider operational range for the radial-inflow design.

Item Details

Item Type:Refereed Article
Keywords:air turbines, oscillating water column, clean power, unidirectional turbine, radial turbine, downstream losses, downstream guide vanes
Research Division:Engineering
Research Group:Maritime Engineering
Research Field:Marine Engineering
Objective Division:Energy
Objective Group:Renewable Energy
Objective Field:Wave Energy
UTAS Author:Ansarifard, N (Ms Nazanin Ansarifard)
UTAS Author:Kianejadtejenaki, S (Mr Seyedsadreddin Kianejadtejenaki)
UTAS Author:Fleming, A (Dr Alan Fleming)
UTAS Author:Chai, S (Professor Shuhong Chai)
ID Code:128919
Year Published:2019
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2018-10-24
Last Modified:2018-11-12
Downloads:0

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