Flow Field Measurement of Laboratory-Scaled Cross-Flow Hydrokinetic Turbines: Part I—The Near-Wake of a Single Turbine
| Autor: | Takuya Kawata, Minh Doan, Yuriko Kai, Shinnosuke Obi |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
vertical-axis
Water flow 020209 energy Naval architecture. Shipbuilding. Marine engineering power measurement counter-rotating VM1-989 Ocean Engineering 02 engineering and technology GC1-1581 Wake Oceanography 01 natural sciences Turbine 010305 fluids & plasmas symbols.namesake cross-flow turbine 0103 physical sciences Marine energy 0202 electrical engineering electronic engineering information engineering marine hydrokinetic Water Science and Technology Civil and Structural Engineering water tunnel Reynolds number Water tunnel Particle image velocimetry symbols Environmental science Cross-flow turbine Marine engineering |
| Zdroj: | Journal of Marine Science and Engineering, Vol 9, Iss 489, p 489 (2021) Journal of Marine Science and Engineering Volume 9 Issue 5 |
| ISSN: | 2077-1312 |
| Popis: | Recent developments in marine hydrokinetic (MHK) technology have put the cross-flow (often vertical-axis) turbines at the forefront. MHK devices offer alternative solutions for clean marine energy generation as a replacement for traditional hydraulic turbines such as the Francis, Kaplan, and Pelton. Following previous power measurements of laboratory-scaled cross-flow hydrokinetic turbines in different configurations, this article presents studies of the water flow field immediately behind the turbines. Two independent turbines, which operated at an average diameter-based Reynolds number of approximately 0.2×105, were driven by a stepper motor at various speeds in a closed circuit water tunnel with a constant freestream velocity of 0.316 m/s. The wakes produced by the three NACA0012 blades of each turbine were recorded with a monoscopic particle image velocimetry technique and analyzed. The flow structures with velocity, vorticity, and kinetic energy fields were correlated with the turbine power production and are discussed herein. Each flow field was decomposed into the time averaged, periodic, and random components for all the cases. The results indicate the key to refining the existed turbine design for enhancement of its power production and serve as a baseline for future comparison with twin turbines in counter-rotating configurations. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|