Projects per year
Abstract
Introducing a duct along the perimeter of a rotor has been acknowledged to augment turbine performance. The outcome causation due to a bi-directional, cylindrical shroud, however, is uncertain. This study analyses the hydrodynamic swallowing capacity of a true-scale, vacant duct for tidal turbine applications in aligned and yawed inlet flow conditions by utilising three-dimensional unsteady computational fluid dynamics. The performance is investigated within free-stream magnitudes of 1 to 7 m.s −1, and a bearing angular range of 0° to 45° with the duct axis. In proportion to the free-stream magnitude, the normalised axial velocity through the duct increases as a result of a diminishment in pressure drag. Within yawed flow, the maximum capacity falls at a bearing of 23.2°, resulting in a performance increase of 4.13% above that at aligned flow conditions. The analysis concludes that the augmentation at yawed flow occurs due to the duct cross-sectional profile lift variation with angle-of-attack. Towards nominal yaw angle, the internal static pressure reduces, permitting a higher mass-flow rate. Beyond the nominal angle-of-attack, flow separation occurs within the duct, increasing pressure drag, thereby reducing the swallowing capacity.
Original language | English |
---|---|
Article number | 182 |
Number of pages | 22 |
Journal | Journal of Marine Science and Engineering |
Volume | 9 |
Issue number | 2 |
DOIs | |
Publication status | Published - 10 Feb 2021 |
Keywords
- swallowing capacity
- duct flow
- ducted turbines
Fingerprint
Dive into the research topics of 'A numerical swallowing-capacity analysis of a vacant, cylindrical, bi-directional tidal turbine duct in aligned & yawed flow conditions'. Together they form a unique fingerprint.Projects
- 1 Finished
-
Supergen ORE Hub 2018
EPSRC (Engineering and Physical Sciences Research Council)
1/07/18 → 30/06/23
Project: Research