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Design optimization of a purely radial turbine for operation in the inhalation mode of an oscillating water column


Ansarifard, N and Kianejad, SS and Fleming, A and Henderson, A and Chai, S, Design optimization of a purely radial turbine for operation in the inhalation mode of an oscillating water column, Renewable Energy, 152 pp. 540-556. ISSN 0960-1481 (2020) [Refereed Article]

Copyright Statement

2020 Elsevier Ltd. All rights reserved

DOI: doi:10.1016/j.renene.2020.01.084


A vented Oscillating-Water-Column (OWC) simplifies the pneumatic energy conversion problem by rectifying air flow and enabling a unidirectional-air-turbine to be employed. It shifts power-extraction to the inhalation phase of the cycle and provides equivalent pneumatic power to a full-wave-cycle. Conventional Radial-air-turbines feature a low global-efficiency in OWC applications, however they offer simpler designs and lower thrust loads. The aim of this study is to modify the design of a centripetal-radial-turbine for optimum efficiency in steady-state using CFD methods for application with the pressure/flow profile experienced by the vented-OWC. Nine design variables were used to control the shape of the rotor and its adjustment to the inward-flow direction. The optimized rotor was found to achieve significant efficiency and output power by using asymmetric and non-zero-staggered blades. The downstream section was optimized for an efficient matching with the optimized-inflow-rotor and four parameters were used to control the shape of the downstream section. A diffuser with a 7-degree diffusion-angle was found to be the optimal connection between the turbine and the chamber. The inflow radial turbine obtained 81% peak efficiency in the steady-state, and its average efficiency over the expected flow coefficients is comparable to the axial-turbines used with OWCs.

Item Details

Item Type:Refereed Article
Keywords:air turbines, oscillating water column, design optimization
Research Division:Engineering
Research Group:Maritime engineering
Research Field:Ocean engineering
Objective Division:Energy
Objective Group:Renewable energy
Objective Field:Hydro-electric energy
UTAS Author:Ansarifard, N (Ms Nazanin Ansarifard)
UTAS Author:Kianejad, SS (Mr Seyedsadreddin Kianejadtejenaki)
UTAS Author:Fleming, A (Dr Alan Fleming)
UTAS Author:Henderson, A (Associate Professor Alan Henderson)
UTAS Author:Chai, S (Professor Shuhong Chai)
ID Code:137025
Year Published:2020
Web of Science® Times Cited:1
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2020-01-29
Last Modified:2020-04-30

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