Study of particles deposition on film-cooled leading edge with transverse trenches and convex structures by experimental simulations

The leading edge of turbine vane usually suffers severe particles deposition. An experiment at ambient temperature is designed to simulate particles deposition on film-cooled leading edges with transverse trenches and micro convex structures, aiming to investigate their effects on the deposition and cooling effectiveness on the leading edge. The results show that the trenches could make the deposition distribution more uniform along the row of film cooling holes and the micro convex structures have a little similar effect. As the trench depth increases from 0.0D to 1.0D, the deposition rate is reduced and not changed remarkably by further increasing the depth. The micro convex structures could further reduce the deposition but only remarkably for the models with shallow trenches. As blowing ratio increases, the deposition rate increases and could be reduced by the trenches and micro convex structures. The trenches have better robust for reducing the deposition and could reduce the cooling effectiveness loss due to the deposition. The micro convex structures only could increase slightly the cooling effectiveness near film cooling holes for the reference model. The results may be helpful for designing film cooling configuration on the leading edge of turbine vane to reduce the damage of deposition.