Influence of upstream turbulence on the wake characteristics of a tidal stream turbine.
Journal article
| Authors | Ahmadi, Mohammad H.B. |
|---|---|
| Abstract | The influence of the upstream turbulence intensity on the flow characteristics downstream of a laboratory-scale horizontal axis tidal stream turbine is investigated in this study. Three test cases with the same mean velocity and different turbulence intensities are simulated numerically using the hybrid large eddy simulation/actuator line modelling technique. The mean velocity components, mean turbulent fluctuations, velocity deficit and wake extension are compared along the streamwise direction to examine the upstream turbulence effects. The inflow conditions are generated by the mapping method using the mean velocity and turbulent profiles experimentally obtained for a turbulent open channel flow. Comparing results for the mean velocity and turbulent fluctuations shows that the upstream turbulence level strongly affects the flow characteristics downstream of the turbine by influencing the tip vortices breakdown process and in turn wake recovery. The comparison also reveals that the ambient turbulence level strongly influences the velocity deficit but it does not significantly affect the streamwise velocity and the radial location of tip vortices in the flow. |
| Keywords | Tidal stream turbines; Actuator line modelling (ALM); Large eddy simulation (LES); Turbulence; Wake recovery; Wake extension |
| Year | 2018 |
| Journal | Renewable Energy |
| Publisher | Elsevier |
| ISSN | 0960-1481 |
| Digital Object Identifier (DOI) | https://doi.org/10.1016/j.renene.2018.08.055 |
| Web address (URL) | http://hdl.handle.net/10545/623169 |
| hdl:10545/623169 | |
| Publication dates | 20 Aug 2018 |
| Publication process dates | |
| Deposited | 30 Nov 2018, 14:41 |
| Accepted | 14 Aug 2018 |
| Rights | Archived with thanks to Renewable Energy |
| Contributors | University of Derby |
| File | File Access Level Open |
| File |
https://repository.derby.ac.uk/item/95529/influence-of-upstream-turbulence-on-the-wake-characteristics-of-a-tidal-stream-turbine
Download files
69
total views29
total downloads3
views this month0
downloads this month
Export as
Related outputs
On wind turbine loading induced by non-uniform approaching flow at high Reynolds numbers
Ahmadi, M. and Yang, Z. 2022. On wind turbine loading induced by non-uniform approaching flow at high Reynolds numbers. Physics of Fluids. 34 (12), p. 125110. https://doi.org/10.1063/5.0112671Wake Structure in Yawed Approaching Flows for an Axial-Flow Wind Turbine
Ahmadi, M. and Yang, Z. 2022. Wake Structure in Yawed Approaching Flows for an Axial-Flow Wind Turbine. Journal of Engineering for Gas Turbines and Power. https://doi.org/10.1115/1.4055420On loading fluctuations induced by energetic large-scale motions for horizontal axis wind turbines
Ahmadi, M. and Yang, Z. 2022. On loading fluctuations induced by energetic large-scale motions for horizontal axis wind turbines. Physics of Fluids. 34 (7), pp. 1-14. https://doi.org/10.1063/5.0096164
Influence of Yawed Wind Flow on the Blade Forces/Bending Moments and Blade Elastic Torsion for an Axial-Flow Wind Turbine
Ahmadi, Mohammad H. B. and Yang, Zhiyin 2021. Influence of Yawed Wind Flow on the Blade Forces/Bending Moments and Blade Elastic Torsion for an Axial-Flow Wind Turbine. American Society of Mechanical Engineers. https://doi.org/10.1115/gt2021-60237On wind turbine power fluctuations induced by large-scale motions
Ahmadi, Mohammad and Yang, Zhiyin 2021. On wind turbine power fluctuations induced by large-scale motions. Applied Energy. 144 (11), pp. 1-8. https://doi.org/10.1016/j.apenergy.2021.116945Numerical study of the coupling between the instantaneous blade loading/power of an axial wind turbine and upstream turbulence at high Reynolds numbers
Ahmadi, Mohammad H.B. and Yang, Zhiyin 2020. Numerical study of the coupling between the instantaneous blade loading/power of an axial wind turbine and upstream turbulence at high Reynolds numbers. Energy. https://doi.org/10.1016/j.energy.2020.118167