Abstract
Wind turbines model in this paper developed from horizontal axis wind turbine propeller with single rotor (HAWT). This research aims to investigating the influence of front rotor diameter variation (D1) with rear rotor (D2) to the angular velocity optimal (ω) and tip speed ratio (TSR) on counter rotating wind turbines (CRWT). The method used transient 3D simulation with computational fluid dynamics (CFD) to perform the aerodynamics characteristic of rotor wind turbines. The counter rotating wind turbines (CRWT) is designed with front rotor diameter of 0.23 m and rear rotor diameter of 0.40 m. In this research, the wind velocity is 4.2 m/s and variation ratio between front rotor and rear rotor (D1/D2) are 0.65; 0.80; 1.20; 1.40; and 1.60 with axial distance (Z/D2) 0.20 m. The result of this research indicated that the variation diameter on front rotor influence the aerodynamics performance of counter rotating wind turbines.
Highlights
Application of wind energy as an alternative energy using wind turbines have been carried out in Indonesia
Kumar et al [4], based on the theory of momentum (Betz limit), the maximum energy conversion efficiency of single rotor wind turbine about 59% while the counter rotating wind turbine with the same swept area increased to 64%
The basic principle of a computational fluid dynamics (CFD) is discretized set into the algebra equations that can be solved by a computer
Summary
Application of wind energy as an alternative energy using wind turbines have been carried out in Indonesia. Wind turbines are used as a power generation system that converts kinetic energy of wind into mechanical energy to drive an electric generator. Horizontal axis wind turbine propeller type with single rotor is a wind turbine models commonly used in Indonesia. Single rotor wind turbine according to the blade diameter is divided into micro (≤ 0.1 m), small scale (0.1 m < diameter ≤ 1 m), medium scale (1m < diameter ≤ 5 m), and large scale (> 5 m). The ideal maximum power coefficient of wind turbine dual rotor through actuator disk theory is 64%. Kumar et al [4], based on the theory of momentum (Betz limit), the maximum energy conversion efficiency of single rotor wind turbine about 59% while the counter rotating wind turbine with the same swept area increased to 64%
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