Numerical and Experimental investigation of Multi blade Vertical Axis Wind Turbine

Abstract

Now a days small straight blade Darrius vertical axis wind turbine are receive more attention compared to horizontal wind turbines due to their advantage in urban use because they generate less noise, overall formation simple and less cost. First an efficient design methodology built on the design parameters like number of blade(four,five,six), Blade profile ,Tip to speed ratio influencing a straight bladed-VAWT (SBVAWT) aerodynamic performance and determine the optimal range of above parameters for prototype construction. Wind tunnel performance results are presented for cases of different wind velocity, tip-speed ratio and solidity. The main purpose numerical study described here is to investigate effect of camber in blade profile of NACA0022 SB-VAWT on its Self- Starting capability using CFD simulation. It is found that asymmetric blade profile NACA 2422 and NACA 4422 with camber instead of symmetric blade profile improves self-starting capability of SB-VAWT. Results indicated wind turbine with blades of asymmetric and thick blade-section was generally more suitable for applying to SB-VAWT. All results of above this study can be used the optimization design parameters of VAWT blades in further. Comparison of the overall multi blade vertical axis wind turbine performance parameters has been studied through numerical simulations and experimental measurements.