Numerical investigation on particle deposition characteristics in vicinity of film cooling holes

Numerical study on the particles movement and deposition in the vicinity of film cooling holes was performed, focusing on the effects of particle diameter and film outflow blowing ratio on the particle movement and deposition characteristics. Based on the EI-Batsh deposition model including particle sticking/rebounding and particle detachment, user definition functions were linked with FLUENT to predict the particle deposition, and verify the calculation data with relevant experimental data. The research results show that the deposition rates of 1,2μm diameter particles increase with the growing blowing ratio, but the deposition rates of 3,4μm diameter particles decrease with the growing blowing ratio.1 μm diameter particles are prone to deposit in the local region between adjacent film cooling holes under the suction of kidney vortices, and the particle deposition rate of the blowing ratio of 2 is about 5 times higher than that of the blowing ratio of 0. The trajectories of 5μm diameter particles are less affected by the film outflow. The total deposition rate decreases with the increase of blowing ratio, and the total deposition rate at blowing ratio of 2 decreases by 1.7% compared with that at blowing ratio of 0.