Hydrodynamic performance of a vertical axis tidal current turbine with angular speed fluctuation

ABSTRACT The angular speed of Vertical axis tidal current turbines (VATTs) should undulate in one periodic rotation given their inherent special structure. A coupled dynamic numerical simulation method is presented to study the effect of angular speed fluctuation on the performance of a VATT. The CFX User Fortran interface is applied to simultaneously solve the fluid conservation and rigid motion equations. The angular speed and acceleration of the turbine at specific time steps are determined by solving the moment equation of the rigid blade, and the force on the blade is obtained from the dynamic integral of the fluid field. The numerical simulation and experimental results suggest that coupled numerical simulation is necessary for small moment of inertia because the amplitude of the angular speed fluctuation is approximately 28% of the average value. Undulation of the load and the moment caused by unsteady angular speeds will reduce the turbine’s energy extraction.

[1]  R. Templin.  Aerodynamic performance theory for the NRC vertical-axis wind turbine , 1974 .

[2]  Strickland,et al.  Darrieus turbine: a performance prediction model using multiple streamtubes , 1975 .

[3]  J. H. Strickland,et al.  A Vortex Model of the Darrieus Turbine: An Analytical and Experimental Study , 1979 .

[4]  Ion Paraschivoiu.  Aerodynamic Loads and Performance of the Darrieus Rotor , 1982 .

[5]  Erik Dick,et al.  A free vortex simulation method for the straight bladed vertical axis wind turbine , 1987 .

[6]  F. Menter.  Two-equation eddy-viscosity turbulence models for engineering applications , 1994 .

[7]  Fernando L. Ponta,et al.  An improved vertical-axis water-current turbine incorporating a channelling device , 2000 .

[8]  Katsuyuki Suzuki,et al.  Output Characteristics of Darrieus Water Turbine With Helical Blades For Tidal Current Generations , 2002 .

[9]  Izumi Ushiyama,et al.  Straight Wing Vertical Axis Wind Turbines: A Flow Analysis , 2005 .

[10]  L. B. Wang,et al.  A potential flow 2-D vortex panel model: Applications to vertical axis straight blade tidal turbine , 2007 .

[11]  Seung Jo Kim,et al.  Optimization of cycloidal water turbine and the performance improvement by individual blade control , 2009 .

[12]  Sander M. Calisal,et al.  A Discrete Vortex Method for Simulating a Stand-Alone Tidal-Current Turbine: Modeling and Validation , 2010 .

[13]  M Shives,et al.  Overall Efficiency of Ducted tidal current turbines , 2010, OCEANS 2010 MTS/IEEE SEATTLE.

[14]  Atilla Incecik,et al.  Flow control for VATT by fixed and oscillating flap , 2013 .

[15]  Zhi Tao,et al.  Turbulence modeling of deep dynamic stall at relatively low Reynolds number , 2012 .

[16]  Liang Zhang,et al.  Research on the unsteady hydrodynamic characteristics of vertical axis tidal turbine , 2014 .

[17]  Giles Thomas,et al.  Numerical investigation of the influence of blade helicity on the performance characteristics of vertical axis tidal turbines , 2015 .

[18]  Yong Ma,et al.  The effects of surge motion of the floating platform on hydrodynamics performance of horizontal-axis tidal current turbine , 2015 .

[19]  Liang Zhang,et al.  The effects of yawing motion with different frequencies on the hydrodynamic performance of floating vertical-axis tidal current turbines , 2016 .

[20]  Shahram Derakhshan,et al.  Experimental and numerical study of a vertical axis tidal turbine performance , 2017 .

[21]  S. Turnock,et al.  Two-dimensional fluid–structure interaction analysis of a vertical axis tidal turbine blade using periodic inflow equivalence model , 2018 .