A Fast Calculation Method for Water Drop Collision Coefficient of Wind Turbine Blades During Icing Process Based on Boundary Element Method

The simulation of icing on fan blades primarily involves three processes: water droplet collision, capturing, and freezing. The calculation of local collision coefficient of water droplets is of utmost importance. This article presents a simulation calculation model for the flow field of a fan blade airfoil based on the boundary element method. It derives a criterion for water droplet collision on the blade surface and achieves rapid tracking and collision assessment of water droplet trajectories. Furthermore, a method is proposed to calculate the local collision coefficient of water droplets based on the collision velocity of water droplets and the normal vector of the blade boundary. Based on this methodology, simulation calculations were conducted to determine the collision coefficients of water droplets on both clean and icing fan blades. The results of these calculations were compared with those obtained using the finite element method. The findings indicate that the calculation method for the local collision coefficient of water droplets on fan blades, based on the boundary element method outlined in this paper, exhibits high accuracy and can be employed for the rapid calculation of water droplet collision coefficients in the simulation process of fan blade icing.