Abstract:

Numerical methods for determining the trajectories of the water droplets are studied for anti icing system design. Based on the calculation of flowfield around the icing surface, through judging the droplet location and determining the insert value of flowfield velocity at the droplet location in a given cell and judging the boundary of the droplet trajectories, numerical results of the equations of motion for the droplets are presented by using a difference method, and the droplet trajectories are obtained. Then, the impact range on the inlet surface, the total collection efficiency, and the local collection efficiency are determined. In addition, the droplet trajectories of an engine inlet, as an example, are calculated, and the effects of flight height, flight velocity, and radius of water droplet on droplet trajectories are also investigated. These results show that the numerical method in this paper is effective.

Key words: anti-icing, trajectories of the water droplets, numerical method, flow field, difference method