Particles deposition on plates with different film cooling hole shapes for different blowing ratios and angles of attack

Abstract

Turbine vanes may be subjected to the deposition of particles such as dust from the external environment. The deposition could affect their aerodynamic and cooling performances. As an effective cooling method, the film cooling could alter the deposition. In this paper, the deposition experiments at ambient temperature were conducted by using atomized wax as the substitute for real particles to investigate the influence of film cooling hole shapes on the deposition for different blow ratios and angles of attack. The results indicate that within the range of blowing ratios in this paper, the deposition on the pressure surface of different hole shapes increases with increasing blowing ratio. Among them, the cylindrical model exhibits the most significant variation in deposition, for example, with a relative increase of 94% in deposition when the blowing ratio was increased from 2.0 to 2.5. The CONSOLE test model showed a relative increase of 60%, while the conical and fan-shaped test model exhibited a relative increase of 20%. The conical, CONSOLE, and fan-shaped film cooling holes can mitigate the influence of the blowing ratio on the deposition of particles. Within the range of angle of attack in this paper, the deposition on the pressure surfaces with different hole shapes increases with the increase in the absolute value of angle of attack. The cylindrical test model exhibits the most significant variation. The conical and fan-shaped holes can mitigate the influence of the angle of attack on the deposition of particles.