Joint scalar transported probability density function modeling of turbulent methanol jet diffusion flames

摘要: A transported joint probability density function (JPDF) approach is applied to computer four (M1–M4) turbulent ( Re ≅39,200, 53,500, 62,100, and 69,600) CH 3 OH/air jet diffusion flames investigated experimentally by Masri coworkers. The cover conditions from stable combustion close extinction. present work provides an assessment of the ability PDF model detailed chemical structure such related phenomena including local extinction/reignition. closure for methanol obtained through a systematically reduced variant comprehensively validated 32 species 167 reaction C/H/O mechanism Lindstedt form features 14 independent, 4 dependent, steady-state scalars. takes full account C 2 chemistry. computational method solution scalar JPDF moving particles in Lagrangian framework second moment Speziale et al. used velocity field. Molecular mixing modeled using ubiquitous modified Curl's Janicka it shown that good field predictions are possible across range Reynolds numbers. An interesting result computations are, despite simplicity molecular (e.g., separated composition space), able predict high levels extinction flame M4 burner nozzle x/D =10) subsequent reignition further downstream. parametric analysis time-scale ratio turbulence confirms greatly increased sensitivity as blow-off approached.