A radial inflow air turbine design for a vented oscillating water column
| Autor: | Shuhong Chai, Nazanin Ansarifard, S.S. Kianejad, Alan Fleming |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Rotor (electric)
020209 energy Mechanical Engineering Radial turbine Airflow Oscillating Water Column 02 engineering and technology Building and Construction Inflow Mechanics Pollution Turbine Industrial and Manufacturing Engineering law.invention General Energy 020401 chemical engineering law 0202 electrical engineering electronic engineering information engineering Environmental science 0204 chemical engineering Electrical and Electronic Engineering Casing Civil and Structural Engineering Ram air turbine |
| Zdroj: | Energy. 166:380-391 |
| ISSN: | 0360-5442 |
| DOI: | 10.1016/j.energy.2018.10.068 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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