Numerical analysis of wake turbulence between hybrid tidal turbine and hypothetical actuator cylinder for shallow water with low velocity conditions
Keywords:vertical turbine, Hydrodynamics, Nested turbine, Marine energy, Velocity recovery
Towards modernisation of the technological era, electricity demands have been an issue. Although the supply of electrical energy from the renewable sources are increasing, it is still not sufficient to offset the carbon production. Malaysia as a developing country needs ample of supply of electrical energy. As most of the current electrical energy for the country are being produced by non renewable sources, the Malaysian government have started looking into renewable options to produce electrical energy. There are various sources of energy that are available in Malaysia such as solar, natural gas, petroleum, ocean energy and many more. This paper is focused on the tidal energy which is an ocean energy that can produce electrical energy by using the power of tide. This research explores the hybrid turbine design which is a type of vertical-axis tidal turbine that combines two distinct type of devices, namely Savonius and H-Darrieus turbines. Hybrid turbine is useful as it helps to overcome the limitation of individual turbine and also be able to produce energy at a low water velocity. Numerical analysis is employed to investigate the wake recovery behaviour and turbulent mixing due to the positioning of the device using Ansys CFD Fluent. By understanding the general wake characteristics produced by each device, proper planning can be done to configure these devices in an array for future planning. The simulation result shows that the hybrid turbine utilising NACA0015 and NACA0018 with nested configuration demonstrates faster velocity recovery compared to NACA0021. The turbulence wake results also provides a promising output which shows the acceleration of flow at the downstream region for hybrid nested NACA0015 and NACA0018 are more narrow compared to NACA0021. The result of this simulation has also been validated with published data. In a nutshell, the NACA blade design not only affects the performance of the turbine but can also influence the velocity recovery downstream of the device.
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