eCite Digital Repository
Design optimization of a purely radial turbine for operation in the inhalation mode of an oscillating water column
Citation
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]
 | PDF Pending copyright assessment - Request a copy 6Mb |
DOI: doi:10.1016/j.renene.2020.01.084
Abstract
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 (Dr Alan Henderson) |
| UTAS Author: | Chai, S (Professor Shuhong Chai) |
| ID Code: | 137025 |
| Year Published: | 2020 |
| Deposited By: | NC Maritime Engineering and Hydrodynamics |
| Deposited On: | 2020-01-29 |
| Last Modified: | 2020-01-29 |
| Downloads: | 0 |
Repository Staff Only: item control page