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Experimental study of self-starting physics for H-type wind turbine
Author(s): J. Y. Zhu, P. Q. Liu
Keywords: Wind energy, H-type wind turbine,Self-starting,Aerodynamic characteristics,Wind tunnel test
In order to study self-stating physics for H-type wind turbine, firstly, the effect of low Reynolds number and large separated flow on aerodynamic characteristics of airfoil were analyzed theoretically, then two H-type wind turbines with different aerodynamic configurations were tested in a low speed wind tunnel for collecting the static torques at different phase angles and time-rotating speed curves in starting process. Based on theoretical analysis and experimental data, the cause of self-stating problem of H-type wind turbine has been revealed.The static torque characteristic indicates that the aerodynamic profile parameters of the rotor directly influence the dependency of starting on initial phase position, the minimum static torque determines whether the rotor starts from rest. The time-rotating speed curves exhibit two different starting behaviour features, determined by the minimum dynamic torque in driving force conversion stage. Only if both the minimum static torque and minimum dynamic torque in driving force conversion stage are greater than the friction torque, the self-starting of H-type wind turbine can be realized with typical self-starting behavior characteristics that the time-rotating speed curve includes four different stages of initial linear acceleration, plateau, rapid acceleration and stable equilibrium with the final tip speed ratio more than 1.