Large eddy simulation of evaporating sprays in complex geometries using Eulerian and Lagrangian methods

摘要: Due to efforts reduce NOx emissions of aeronautical combustors, there is a recent trend towards lean combustion technologies. This results in novel injector designs, which are characterized by increased geometrical complexity and new injection strategies for the liquid fuel, such as multipoint systems. Both elements create additional challenges numerical simulation tools. Large-Eddy (LES) regarded most promising method capture complex flow phenomena an application. In present work, two main areas interest considered: The first wall modeling, remains challenging field LES, particular geometries. A implementation functions that uses no-slip condition at proposed. It shown realistic burner geometry formulation yields improved compared classical implementation. Furthermore, capability typical LES with models predict pressure drop representative assessed sources error identified. second topic fuel combustor. With Eulerian Lagrangian methods, different approaches available this task. approach considers droplet spray continuum transport equations can be formulated. formulation, individual droplets tracked, leads simple but terms numerics due large number particles treated. comparison these methods under identical conditions (gaseous solver, physical models) central aspect work. important studied view final application evaporation problem transverse jets gaseous crossflow simplified representation system. case configuration single mounted experimental test bench. allows simultaneously apply all preliminary developments. considered non-reactive otherwise corresponds partial load regime aeroengine pre-heated conditions, issued multi-point undergoes evaporation. simulated using data.