Four ice-protection structures with different film-slot angles were designed

an Eulerian-framework based droplet impingement computation method was developed and verified to study the influences of film-slot angle and blowing ratio on droplet impingement characteristics for 20μm diameter. The results indicated that the exterior hot-film can blow the droplet away to decrease local collection efficiency and impingement limitation significantly

and the influence was more evident when the position of film-slot was closer to strut leading edge

the average local collection efficiencies of four structures declined 82%

8%

1% and 0.5%

respectively

compared with no-film situation. Besides

the maximum local collection efficiency and impingement limitation decreased with the increasing blowing ratio. The impingement characteristics of film-slot angle 5°was most sensitive to blowing ratio. Similar local collection efficiency distribution features were presented at leading edge. For rear area

when blowing ratio was big enough

no droplet impinged on the surface.