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Vertical Axis

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Mingyi Tan - One of the best experts on this subject based on the ideXlab platform.

  • A study of modified Vertical Axis tidal turbine to improve lift performance
    International Journal of Electrical Energy, 2016
    Co-Authors: Nu Rhahida Arini, Stephen R. Turnock, Mingyi Tan
    Abstract:

    A design of Darrieus Vertical Axis tidal turbine using modified airfoil was studied numerically in this work. The turbine design was evaluated in 2D CFD model using k-? turbulence model, upwind interpolation scheme and simulated using OpenFOAM. The turbine had three blades which were arranged symmetrically. The blades were of NACA 0012 airfoil which had been modified in the trailing edge region to increase its lift performance. The modification was made by truncating the trailing edge at the 15% of chord length from the trailing edge. Single normal and blunt airfoil were modelled and investigated prior to the turbine design evaluation. For generating the mesh, C-structured grid was employed to the single airfoil model and hybrid mesh to the Vertical Axis tidal turbine model. From the single airfoil simulations, it was found that blunt NACA0012 had 12% higher lift coefficient than normal airfoil and the pressure coefficient magnitude of blunt Vertical Axis tidal turbine significantly rise two times from Vertical Axis tidal turbine using normal NACA0012 airfoil.

Thorsten Stoesser - One of the best experts on this subject based on the ideXlab platform.

  • The influence of blade roughness on the performance of a Vertical Axis tidal turbine
    International Journal of Marine Energy, 2017
    Co-Authors: Luis Priegue, Thorsten Stoesser
    Abstract:

    This paper reports the findings of an experimental study investigating the influence of blade roughness on the performance of a Vertical Axis tidal turbine. Due to their design, Vertical Axis turbines undergo periods of stall, i.e. flow separation from the blade, during each revolution. It is hypothesised that roughening turbine blades delays flow separation (in analogy to flows over rough bluff bodies) and hence diminishes turbine stall which in turn should result in an increase in turbine performance. Laboratory experiments were undertaken in Cardiff University’s hydraulics laboratory, testing Vertical Axis turbines with rotors comprising smooth and rough blades. Three different blade surface roughnesses were tested, with the results showing a significant reduction in performance when the turbine is operating at high chord Reynolds numbers and with rough blades. In addition, the combined effect of blade roughness and rotor solidity as well as blade roughness and number-of-blades on the performance of Vertical Axis turbines are analysed. It is shown that solidity and number-of-blades appear to be similarly influential than blade roughness.

Nu Rhahida Arini - One of the best experts on this subject based on the ideXlab platform.

  • A study of modified Vertical Axis tidal turbine to improve lift performance
    International Journal of Electrical Energy, 2016
    Co-Authors: Nu Rhahida Arini, Stephen R. Turnock, Mingyi Tan
    Abstract:

    A design of Darrieus Vertical Axis tidal turbine using modified airfoil was studied numerically in this work. The turbine design was evaluated in 2D CFD model using k-? turbulence model, upwind interpolation scheme and simulated using OpenFOAM. The turbine had three blades which were arranged symmetrically. The blades were of NACA 0012 airfoil which had been modified in the trailing edge region to increase its lift performance. The modification was made by truncating the trailing edge at the 15% of chord length from the trailing edge. Single normal and blunt airfoil were modelled and investigated prior to the turbine design evaluation. For generating the mesh, C-structured grid was employed to the single airfoil model and hybrid mesh to the Vertical Axis tidal turbine model. From the single airfoil simulations, it was found that blunt NACA0012 had 12% higher lift coefficient than normal airfoil and the pressure coefficient magnitude of blunt Vertical Axis tidal turbine significantly rise two times from Vertical Axis tidal turbine using normal NACA0012 airfoil.

Luis Priegue - One of the best experts on this subject based on the ideXlab platform.

  • The influence of blade roughness on the performance of a Vertical Axis tidal turbine
    International Journal of Marine Energy, 2017
    Co-Authors: Luis Priegue, Thorsten Stoesser
    Abstract:

    This paper reports the findings of an experimental study investigating the influence of blade roughness on the performance of a Vertical Axis tidal turbine. Due to their design, Vertical Axis turbines undergo periods of stall, i.e. flow separation from the blade, during each revolution. It is hypothesised that roughening turbine blades delays flow separation (in analogy to flows over rough bluff bodies) and hence diminishes turbine stall which in turn should result in an increase in turbine performance. Laboratory experiments were undertaken in Cardiff University’s hydraulics laboratory, testing Vertical Axis turbines with rotors comprising smooth and rough blades. Three different blade surface roughnesses were tested, with the results showing a significant reduction in performance when the turbine is operating at high chord Reynolds numbers and with rough blades. In addition, the combined effect of blade roughness and rotor solidity as well as blade roughness and number-of-blades on the performance of Vertical Axis turbines are analysed. It is shown that solidity and number-of-blades appear to be similarly influential than blade roughness.

Stephen R. Turnock - One of the best experts on this subject based on the ideXlab platform.

  • A study of modified Vertical Axis tidal turbine to improve lift performance
    International Journal of Electrical Energy, 2016
    Co-Authors: Nu Rhahida Arini, Stephen R. Turnock, Mingyi Tan
    Abstract:

    A design of Darrieus Vertical Axis tidal turbine using modified airfoil was studied numerically in this work. The turbine design was evaluated in 2D CFD model using k-? turbulence model, upwind interpolation scheme and simulated using OpenFOAM. The turbine had three blades which were arranged symmetrically. The blades were of NACA 0012 airfoil which had been modified in the trailing edge region to increase its lift performance. The modification was made by truncating the trailing edge at the 15% of chord length from the trailing edge. Single normal and blunt airfoil were modelled and investigated prior to the turbine design evaluation. For generating the mesh, C-structured grid was employed to the single airfoil model and hybrid mesh to the Vertical Axis tidal turbine model. From the single airfoil simulations, it was found that blunt NACA0012 had 12% higher lift coefficient than normal airfoil and the pressure coefficient magnitude of blunt Vertical Axis tidal turbine significantly rise two times from Vertical Axis tidal turbine using normal NACA0012 airfoil.