Ansarifard, N and Kianejad, SS 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 2018 Elsevier Ltd.
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 Type:||Refereed Article|
|Keywords:||air turbines, oscillating water column, clean power, unidirectional turbine, radial turbine, downstream losses, downstream guide vanes|
|Research Group:||Maritime engineering|
|Research Field:||Marine engineering|
|Objective Group:||Renewable energy|
|Objective Field:||Wave energy|
|UTAS Author:||Ansarifard, N (Ms Nazanin Ansarifard)|
|UTAS Author:||Kianejad, SS (Mr Seyedsadreddin Kianejadtejenaki)|
|UTAS Author:||Fleming, A (Dr Alan Fleming)|
|UTAS Author:||Chai, S (Professor Shuhong Chai)|
|Web of Science® Times Cited:||12|
|Deposited By:||NC Maritime Engineering and Hydrodynamics|
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