Subgrid Modeling for Simulation of Spray Combustion in Large-Scale Combustors

摘要: Simulations of spray combustion in full-scale combustors under different operating conditions are conducted using large-eddy simulations (LES). The current methodology attempts to capture not only spray-turbulence interactions but also subgrid fuel-air mixing and finite-rate kinetics occurring at scales below the LES resolution. Reduced for n-heptane kerosene fuels used these studies predict pollutant emission. Comparison predictions with measurements a single-cup swirl combustor shows reasonably good agreement. Results realistic two-cup sector show complex vortex breakdown process that creates multiple recirculation regions combustor. These provide sites stabilize flame. Because shape combustor, significant three-dimensional effects apparent no similarity between flame structures, bubbles, outflow two cups. Spray is quite efficient during full power operation because distributed injection process. It shown approach stabilization more physical, anchors downstream dump plane. In contrast, conventional study eddy breakup model anchored inside inlet, Immediately injector, which unphysical.