A multilevel study on the variation characteristics of tip wake to wind turbines with different fusion tip structures

Based on the regional division and spatial discretization strategy of the established effective computational fluid dynamics (CFD) numerical model for the wake of an original tip wind turbine blade, a corresponding high-precision CFD calculation model is developed for a series of blade tip wind turbines with different fused tip structures. Transient numerical calculation results are obtained for each base sample matrix corresponding to different geometric parameters of the blade tip. The multi-level proper orthogonal decomposition (POD) mode spatial distribution characteristics of the blade tip vortex wake flow in wind turbines with various fusion tip structures were quantified using a self-developed POD data interface program. This paper analyzes the influence of bending in fusion tip structure on the distribution of vortices at the near-wake region, aiming to find a new and more effective control approach to address full-order flow energy intervention in active flow control.