Enhanced Antideposition Performance of Film Cooling With a Shaped Sweeping Jet Hole

Abstract

Shaped sweeping jet (SSJ) holes represent an advancement in sweeping jet (SJ) technology, as they offer enhanced cooling performance. To reveal the antideposition capabilities of SSJs, particle deposition results of 777-shaped and SSJ holes were compared through a combination of experiments and numerical simulations. Three-dimensional (3D) deposition topography was measured through the multiperspective scanning (MPS) method across various blowing ratios (M = 0.5, 1.0, 1.5, and 2.0). The findings revealed that SSJ holes exhibited superior antideposition performance across a range of blowing ratios, resulting in a 5–14% reduction in deposition roughness compared with the 777-shaped holes. To improve the precision of particle deposition simulations, a novel deposition and removal model incorporating an unsteady simulation strategy was developed and quantitatively validated against experimental results. Computational analyses revealed that the remarkable antideposition performance of SSJ holes was due to the formation of unique vortex structures, distinct from the counter-rotating vortex pair, and the increased level of periodic oscillation-induced wall shear stress near the hole exit. These findings underscore the potential of SSJ technology in film-cooling applications to mitigate deposition concerns.