Experimental Study of tip region flow field structure of wind wheel with or without S tip vane

This paper, in three tip-speed ratios, uses linear cross-correlation PIV system and adopts sampling technology of shaft encoder positioning cycle to measure tip region flow-field structure of rotating wind wheel of a horizontal axis wind turbine, and the rotating wind wheel is in two situations which are provided with or without S tip vane, obtaining instantaneous figure and average-time figure. The experiment result indicates that the structure of flow field is similar with or without S tip vane, S tip vane improves the speed distribution of the flow field, the fluctuation range of vortex core in the flow field with S tip vane is not very large, and its vortex core diameter becomes small and small, the scope of the internal wake flow region decreases.