Abstract
Recently, focus has been placed on ocean energy resources because environmental concerns regarding the exploitation of hydrocarbons are increasing. Among the various ocean energy sources, tidal current power (TCP) is recognized as the most promising energy source in terms of predictability and reliability. The enormous energy potential in TCP fields has been exploited by installing TCP systems. The flow velocity is the most important factor for power estimation of a tidal current power system. The kinetic energy of the flow is proportional to the cube of the flow’s velocity, and velocity is a critical variable in the performance of the system. Since the duct can accelerate the flow velocity, its use could expand the applicable areas of tidal devices to relatively low velocity sites. The inclined angle of the duct and the shapes of inlet and outlet affect the acceleration rates of the flow inside the duct. In addition, the volume of the duct can affect the flow velocity amplification performance. To investigate the effects of parameters that increase the flow velocity, a series of simulations are performed using the commercial computational fluid dynamics (CFD) code ANSYS-CFX. Experimental investigations were conducted using a circulation water channel (CWC).
Highlights
Tidal current power (TCP) from ocean energy has huge potential throughout the world
This paper describes the design of a duct that can be the applied to concept of the structure
This paper describes the preliminary of a duct around that canthe be duct applied to a tidal current power system moored to a seabed and the flowdesign characteristics based aon tidal current power system moored to were a seabed andout the to flow characteristics around the duct based carried validate the Experimental studies carried out to validate the Computational fluid dynamics (CFD)
Summary
Tidal current power (TCP) from ocean energy has huge potential throughout the world. It is a very reliable and predictable resource. Many researches have been performed regarding applications of tidal current power systems for example Bahaj et al [1], and Batten et al [2]. Among several types of current turbine systems, the application of duct could increase the upstream velocities and the power extraction from the current. Numerous researches have been presented regarding duct applications for TCP systems [3]. The effect of the diffuser angle which is the angle between cylindrical duct wall and diffuser duct wall on ducted turbine performance was described [5]. A duct system using hydrofoil sections around the turbine was introduced in 2013
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