Experimental analysis of twin blade contra-rotating wind turbine

Responding to current energy demand scenario, there will be a more demand in coming years. The energy requirements of developed and developing country continuously increasing, that will increase the exploration of renewable energy sources, needs more efficient system to meet requirement. The wind energy is one of the area to satisfy current scenario. To meet it, it is important issue to concentrate on small wind energy industry apart from commercial systems. Another critical aspect of wind energy usage is the efficiency with which usable energy is converted into producing power. Enhance technologies such as twin blade contra rotating rotors, generators, gears and lube oils, aero foil shapes and profile, smart pitch control rotors etc. will minimizes the total cost and increase total output power. The purpose of this work is, therefore, to support the effectiveness of employing Twin-blade contra-rotating system to enhance performance of twin blade contra-rotating wind turbine system. With this idea, the contrarotating system works more efficient and produced more power in a unit turbine area. To support this approach, a research model was developed and tested under a variety of operating conditions. To verify turbine system a test were carried out in wind tunnel. Result are presented for cases of different wind speeds, Reynolds number and different angle of attack for blades. The result exhibit a significant increase in wind energy conversion efficiency in case of twin blade contra-rotating system and good response to low wind speed compared to single rotor system of same type.