Numerical study on particle deposition characteristics of turbine blade with cooling film

The aircrafts face the serious issue of particle deposition on blade surface when inevitably working in the dust environment. A simplified C3X turbine blade within film holes is selected to investigate the particle deposition characteristics on blade surface. The EI-Batsh deposition model is applied to observe the particle deposition process and the dynamic grid method is used to rebuild the surface morphology of deposit layer. It is found that the particle deposition rate rises with the increasing particle size due to the increasing impacting frequency of particles. But the deposition rate gradually decreased when the particle diameter increasing to the constant value (15 mu m). The particle density has a little influence on particle deposition in comparison to the particle size, especially when particle density increases to 1700 kg/m(3), density no longer affects the deposition rate. Besides, the deposit layer on blade surface leads to the increase of particle deposition rate due to the increasing roughness when St < 1.