An experimental study of the effects of different transverse trenches on depositing and temperature on a plate with film cooling holes

Particles depositing is a severe damage to the aerodynamic and cooling performance of turbine guide vanes and a technique to decrease depositing is transverse trench. In this paper, the experiments are conducted to study the effects of different transverse trenches on the particles depositing and temperature on a plate. The particles are generated by atomizing molten wax. All the models are made based on a plate and have film cooling holes. Different transverse trenches with different widths and depths are installed along the row of the film cooling holes. The experimental results show that the trenches could alter the depositing mass and distribution on the pressure surface of the model. The narrower or deeper trench could result in the lighter depositing mass and more uniform depositing distribution on the vicinity downstream of the row of film cooling holes. However, the trenches have little effect on the depositing upstream of the row of film cooling holes on the pressure surface of the model. The more depositing under the experimental conditions leads to higher temperature on the pressure surface of the model. The temperature distribution on the vicinity downstream of the row of film cooling holes could also be altered by the trenches. The narrower or deeper trench could make the temperature distribution more uniform. This could be attributed to the effect of the trench on the depositing and the direct effect of itself on the temperature distribution.