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Abstract
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Article Information:
Difference between Fixed and Variable Pitch Vertical Axis Tidal Turbine-Using CFD Analysis in CFX
Syed Shah Khalid, Zhang Liang, Sheng Qi-hu and Zhang Xue-Wei
Corresponding Author: Syed Shah Khalid
Submitted: June 13, 2012
Accepted: June 29, 2012
Published: January 01, 2013 |
Abstract:
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As concerns about rising fossil-fuel prices, energy security and climate-change increase, renewable
energy plays a vital role in producing local, clean and inexhaustible energy to supply world rising demand for
electricity. In this study, hydrodynamic analysis of vertical axis tidal turbine (both fixed pitch and variable pitch) is
numerically analyzed. Two-dimensional numerical modeling and simulation of the unsteady flow through the blades
of the turbine is performed using ANSYS CFX, hereafter CFX, which is based on a Reynolds-Averaged Navies-
Stokes (RANS) model. A transient simulation is done for fixed pitch and variable pitch vertical axis tidal turbine
using a Shear Stress Transport turbulence (SST) scheme. Main hydrodynamic parameters like torque T, combined
moment CM, coefficients of performance CP and coefficient of torque CT, etc., are investigated. The modeling and
meshing of turbine rotor is performed in ICEM-CFD. Moreover, the difference in meshing scheme between fixed
pitch and variable pitch is also mentioned. Mesh motion option is employed for variable pitch turbine. This study is
the one part of the ongoing research on turbine design and developments. The numerical simulation results are
validated with analytical results performed by Edinburgh design Ltd. The study concludes with a parametric study of
turbine performance, comparison between fixed pitch and variable pitch operation for a four-bladed turbine. It is
found that for variable pitch we get maximum CP and peak power at smaller revolution per minute N and tip sped
ratio λ.
Key words: Fixed and variable pitch, simulation, tidal current device, tidal current turbine CFD, tidal energy, Vertical Axis Tidal Turbine (VATT),
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Cite this Reference:
Syed Shah Khalid, Zhang Liang, Sheng Qi-hu and Zhang Xue-Wei, . Difference between Fixed and Variable Pitch Vertical Axis Tidal Turbine-Using CFD Analysis in CFX. Research Journal of Applied Sciences, Engineering and Technology, (01): 319-325.
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ISSN (Online): 2040-7467
ISSN (Print): 2040-7459 |
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