Abstract
As concerns about rising fossil-fuel prices, energy security and climate-change increase, renewable energy can play 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 operating side-by-side is numerically analyzed. Two-dimensional numerical modeling of the unsteady flow through the blades of the turbine is performed using ANSYS CFX, hereafter CFX; this is based on a Reynolds-Averaged Navier-Stokes (RANS) model. The purpose is to find an optimal distance between the turbines where interaction effect is minimal and constructive, where the turbines operate more efficiently than stand alone turbine. A transient simulation is done on Vertical Axis Tidal Turbine (VATT) using the Shear Stress Transport Turbulence (SST) model. Main hydrodynamic parameters like torque T, coefficients of performance C<em><sub>P</sub></em> and coefficient of torque C<em><sub>T</sub></em> are investigated. The gap spacing between the turbines has an important role in performance improvement and also in vortex shedding suppression for the flows around two counters rotating systems. The simulation results are validated with Ye and Calisal data. The results of this study prove that the total power output of a twin-turbine system with an optimal layout can be about 24% higher than two times that of a stand-alone turbine. We conclude that the optimally configured counter-rotating twin turbines should be a side-by-side arrangement.
Highlights
Tidal energy is one of the most important forms of Renewable Energy (RE) which can be used without depleting natural resources such has fossil fuels and wood with minimal environmental effects
Using Li Ye specification and using the above numerical method presented is simulated in ANSYS CFX with three blade geometry, we observed that CoP of a twin turbine system CPD + CPU = 116% and twice of a single turbine system is 89%, so we get 27% more power from a twin turbine system
As the Vertical Axis Tidal Turbine (VATT) is lift based so the turbine can produce more power by increasing the tangential velocity component which enhanced the lift of the turbine
Summary
Tidal energy is one of the most important forms of Renewable Energy (RE) which can be used without depleting natural resources such has fossil fuels and wood with minimal environmental effects. A plot is drawn between coefficients of performance CP = P/(0.5 ρV3A), coefficient of torque CT = T/ (0.5 ρV2AR) against the tip speed ratio λ for single turbine, in these equations P is the power, T is the torque, ρ is the density of water and A is the area of a rotor.
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