Numerical investigation of laboratory tested cross-flow tidal turbines and Reynolds number scaling
| Autor: | Andrew Hillis, Robert Stringer, Jun Zang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Engineering
Turbine blade 020209 energy RANS Mechanical engineering Thrust 02 engineering and technology 01 natural sciences Turbine Scaling 010305 fluids & plasmas law.invention Physics::Fluid Dynamics symbols.namesake law 0103 physical sciences Tidal turbine 0202 electrical engineering electronic engineering information engineering SDG 7 - Affordable and Clean Energy SDG 14 - Life Below Water Low Reynolds number Cross-flow Numerical Computer simulation Renewable Energy Sustainability and the Environment business.industry Reynolds number symbols Reynolds-averaged Navier–Stokes equations business Tidal power Marine engineering |
| Zdroj: | Stringer, R M, Hillis, A J & Zang, J 2016, ' Numerical investigation of laboratory tested cross-flow tidal turbines and Reynolds number scaling ', Renewable Energy, vol. 85, pp. 1316-1327 . https://doi.org/10.1016/j.renene.2015.07.081 |
| Popis: | The cross-flow, or vertical axis tidal turbine, is a prominent configuration of marine renewable energy device aimed at converting tidal currents into electrical energy. This paper highlights the hydrodynamic limitations of laboratory testing such devices and uses numerical simulation to explore the effect of device scaling. Using a 2D Reynolds-Averaged Navier-Stokes (RANS) numerical approach, a single turbine blade is initially modelled and validated against published data. The resultant numerical model is then expanded to emulate an experimental cross-flow tidal turbine designed and tested by the University of Oxford. The simulated turbine achieves a close quantitative match for coefficients of power, torque and thrust, forming the basis of a study exploring the effects of Reynolds number scaling in three alternative operating conditions. It is discovered that the coefficient of power (CP) increases with Re- without a ubiquitous correlation until an Re- of ~350,000. Above this Re- the CP values for all three operation conditions become both proportional and predictable. The study represents a significant contribution to understanding the application of detailed numerical modelling techniques to cross-flow tidal turbines. The findings, with regard to scaling from laboratory data, could reduce uncertainty and development costs for new and existing devices. |
| Databáze: | OpenAIRE |
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