A study on aerodynamic characteristics and visualization of flow field of lift-drag combined starter

This study refers to the modification of the aerodynamic characteristics of the starter for the lift-type vertical axis wind turbine, the structure of the traditional drag starter was improved, and the lift-drag combined starter model was proposed. Based on the CFD numerical simulation and the particle image velocimetry visualization test, the aerodynamic characteristics of the lift-drag combined starter model and the drag starter model are studied, and the reasons for the regular variation of the flow field are explained. The results show that the lift-drag combined starter has obvious advantages over the traditional drag starter in both static start-up characteristics and dynamic output characteristics. The average static torque coefficient of the lift-drag combined starter is increased by 8% compared to that of the drag starter after one revolution. The increasing percentage of the maximum dynamic moment coefficient of the lift-drag combined starter is 89% compared to the drag starter, and the decreasing percentage of the minimum is only 30%.