An experimental study on the mechanics power of counter rotating wind turbines model related with axial distance between two rotors

Abstract

Counter rotating wind turbines is a wind turbines model having two rotors rotating in opposite direction on the same axis. The purpose of the research is to find the optimal power increase can be generated in counter rotating wind turbines model (CRWT) related with variety of axial distance between front rotor and rear rotor. The study consisted of the design and testing of wind turbines model. The design of CRWT model was using parameters based on the related CRWT literature from previous researches both experimental and simulation studies. The study was experimental observation directly on the object of study. The independent variable is the variation of the wind speed of 2.0 m/s, 3.0 m/s and 4.2 m/s as well as a comparison between two rotors axial distance to the front rotor diameter of 0.44; 0.61 and 0.70. The study result shows that the greatest power generated of counter rotating wind turbines model located in axial distance ratio of 0.61 for the three variations of wind speed. The power generated at the axial distance ratio of 0.61 is equal to 0.1532 watts for wind speed 2.0 m/s, 0.2517 watt for wind speed 3.0 m/s and 0.3488 watt for wind speed 4.2 m/s. For axial distance ratio of 0.61, the power coefficient is equal to 0.263 for the wind speed 2.0 m/s, the power coefficient of 0.128 for the wind speed 3.0 m/s, and the power coefficient 0.065 for the wind speed 4.2 m/s.