Numerical study on coupling effects of particle deposition and film cooling over flat plate surfaces

Using a particle deposition model and a dynamic mesh technique， the deposition characteristics over a flat plate surface with film cooling under different mass flow ratios and particle sizes were studied. In addition， the effects of particle deposition on film cooling over the flat plate were investigated. Results revealed that at a low particle velocity， the blowing of the coolant acting on the particles made it difficult to deposit in the downstream region of film holes，and an obvious ridged shape of deposits was formed on both sides due to the blocking and entrainment of the cooling jet. However，distribution of the capture efficiency presented a bimodal pattern with the change of particle sizes. At high mass flow ratios，the ridged deposition significantly improved the cooling effectiveness，which was 6.15% higher than that before deposition. Additionally，particle deposition could enhance the lateral spreading of the coolant and improved the laterally-averaged cooling effectiveness. In general， the effects of particle deposition on film cooling performance were determined by both distribution characteristics and thickness of the deposition. © 2024 Beijing University of Aeronautics and Astronautics (BUAA). All rights reserved.