Direct numerical simulation of slot film cooling downstream of misaligned plates

When manufacturing a turbine engine, the combustor annulus and are created as separate parts assembled. This leads to an inter-platform gap between two components, which must be supplied with leakage air prevent ingestion of extremely hot combustion gases into interior engine. The likely misalign because differential thermal expansion or assembly tolerances. paper presents direct numerical simulation study misalignment flow at junction platforms. geometry is misaligned plates cross-flow simulated slot jet. gives rise forward configuration backward configuration, jet/cross-flow windward mixing layer leeward layer. Compared aligned cooling effectiveness immediately downstream decreases in increases configuration; this response amplifies rate through increases. In addition effectiveness, we report statistics, including velocity, temperature, turbulent kinetic energy relevant fluxes. We find strong turbulence generation high level result. Mixing energy, on other hand, occurs predominantly eddy viscosity conductivity that critical modelling also reported. negative regions where incoming boundary starts mix analysis shows result hysteresis: it takes time, travel distance, before eddies jet come equilibrium, thereby favouring transport Reynolds stress model over local type model. novelty lies simulations, provide access near-wall field clarify effects blowing ratio platform heat transfer. data analysis, sheds light how should modelled.