2020/12/01 by Hasret Turkeri, Xinyu Zhao, Turkeri, Hasret +3
Engineering · Environmental Science · #Atmospheric aerosols and clouds #Combustion and flame dynamics #FOS: Physical sciences #Fluid Dynamics (physics.flu-dyn) #Wind and Air Flow Studies
paper · pdf · doi:10.48550/arxiv.2012.00731
openalex publication_date 2020/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The LES/PDF methodology is applied to the Cambridge/Sandia turbulent\nstratified flame series under swirling conditions. The methane/air chemistry is\nrepresented by a 16-species reduced ARM1 mechanism, and the in situ adaptive\ntabulation method is adopted to accelerate the chemistry calculation. Effects\nof differential diffusion and heat loss through the bluffbody surface are taken\ninto account. The simulations are conducted for premixed (SwB3), moderately and\nhighly stratified (SwB7 and SwB11, respectively) cases under swirling\nconditions. The results from LES/PDF simulations are compared with experimental\nmeasurements. The computed mean and r.m.s. profiles of velocity, temperature,\nequivalence ratio and mass fractions of species are in very good agreement with\nthe measurements for all three conditions. Scatter plots and conditional means\nof species mole fractions and temperature are compared with the experimental\ndata, where overall good consistency with the measurements is achieved. The\nrecirculation zones are five times longer than those obtained under\nnon-swirling conditions. A low-equivalence-ratio high-temperature region near\nthe bluffbody is not captured in the computation, which is attributed to the\ninsuffcient entrainment of downstream mixtures into the recirculation zone. The\nparametric studies show that the differential diffusion has a negligible effect\non the mean and r.m.s. results, whereas the heat loss has a considerable effect\non the temperature and CO profiles close to the bluffbody.\n