Numerical Study on the Performance Of 2-Bladed and 3-Bladed Counter Rotating Wind Turbines

抄録

　In this research, the effect of number of blades (2 and 3) of counter rotating wind turbine (CRWT) were simulated in transient condition to be further analyzed the performance and the fluid flow characteristic formed. The simulations used finite volume method approach with additional turbulance model SST k-omega under transient condition to be analyzed the development of the fluid flow started from idling rotors until rotated on their own steady angular velocities. Results of this research show that 2-bladed CRWT had higher steady angular velocity characteristic than 3-bladed CRWT, both of the front and rear rotors, but 3-bladed CRWT had faster performance in term of time to achieve their steady angular velocities than 2-bladed CRWT during the transient process. In term of mechanical power produced, the 3-bladed CRWT performed better than 2-bladed CRWT, around 10.5% in their own steady angular velocities. This results were supported by velocity deficit flow visualizations and velocity profile in selected regions.