Abstract
Numerical analysis was conducted on the aerodynamic performance and the flow characteristics around the counter-rotating wind turbine or CRWT blade through rear rotor configuration using various rotor diameter ratios and distance ratios to the turbine blade through a CFD (Computational Fluid Dynamics) simulation. CFD simulation showed the normalized power coefficients of the front rotor, rear rotor, and combined rotor (CRWT) to the single rotor with a strong influence of the rear rotor configuration with the addition of tip speed ratio (TSR). A larger average normalized power coefficient takes place at D1/D2=1.0 with L/D1=0.75 by 1.221. It is about 22.1% increased to the SRWT for the given TSR range. Axial velocity contours and resultant velocity vectors around the CRWT blade with a diameter ratio of D1/D2 > 1.0 and a closer rotor distance provide a stronger bound vortex and strong separation around the rear hub blade with a tendency to increase from the hub to the tip blade at low TSR. The higher the TSR, the movement of tip vortex moves closer to the rear tip blade which has the effect of increasing the leakage flow in the area of D1/D2 < 1.0.
Highlights
The development of horizontal axis wind turbine (HAWT) three blades propeller technology today shows a very rapid progress, marked by an increase in turbine efficiency and a decrease in cost per kWh
This study shows that the counter-rotating wind turbine is more efficient than co-axial and can technically be used as an alternator drive for electricity generation because the relative rotation is quite high
This study aims to perform numerical analysis on aerodynamic performance and flow field phenomenon around the CRWT blade or near wake of counter-rotating wind turbine through various rear rotor configurations
Summary
The development of horizontal axis wind turbine (HAWT) three blades propeller technology today shows a very rapid progress, marked by an increase in turbine efficiency and a decrease in cost per kWh. Horizontal axis wind turbine three blades type propeller with a double rotor is known as double rotor wind turbine (DRWT) which has two rotors placed on one axis. DRWT with counter-rotating direction which is better known as counter-rotating wind turbine (CRWT) can generate electricity with or without using a transmission system. This wind turbine has two rotors of the same or different diameter, moving one alternator with the direction of rotation opposite each other. It can increase the power coefficient of two rotor wind turbines higher than single rotor condition. The rotational speed of these two rotors is quite synchronous working together and supporting each other in driving the alternator (Kanemoto and Galal, 2006)
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