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Abstract
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Article Information:
CFD Study of NACA 0018 for Diffuser Design of Tidal Current Turbines
Nasir Mehmood, Zhang Liang and Jawad Khan
Corresponding Author: Nasir Mehmood
Submitted: July 02, 2012
Accepted: July 28, 2012
Published: November 01, 2012 |
Abstract:
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This study is focused on diffuser augmented tidal current turbines that capture the kinetic energy
in a tidal stream. The energy that can be extracted from tides is proportional to the cube of the current
velocity. The role of the diffuser in diffuser augmented tidal turbines is to help accelerate the incoming
current velocity. Consequently, the efficiency of the turbine can be significantly increased by using a
diffuser. The research community is investing considerable time and financial resources in this growing
domain. The diffuser augmented tidal turbines research data is rather scarce due to their emerging nature,
large and costly research and development setup, startup cost and proprietary issues. The purpose of this
study is to investigate the effect of length and angle on NACA 0018 airfoil for diffuser design. CFD
simulation is carried out to investigate velocity and mass flow rate at the throat. The drag force due to
diffuser installation is also calculated. Velocity inside the diffuser increases with diffuser length and angle
of attack. Velocity increases up to stall angle and then drops due to flow separation. The drag force is also
dominant compared to lift coefficient near stall angle region.
Key words: CFD simulation of diffuser, Diffuser Augmented Tidal Turbine (DATT), ducted turbine, numerical simulation of diffuser , shrouded turbine, tidal current turbine, tidal energy
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Cite this Reference:
Nasir Mehmood, Zhang Liang and Jawad Khan, . CFD Study of NACA 0018 for Diffuser Design of Tidal Current Turbines. Research Journal of Applied Sciences, Engineering and Technology, (21): 4552-4560.
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ISSN (Online): 2040-7467
ISSN (Print): 2040-7459 |
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