Direct numerical simulations of autoignition in stratified dimethyl-ether (DME)/air turbulent mixtures
作者： Gaurav Bansal , Ajith Mascarenhas , Jacqueline H. Chen
DOI: 10.1016/J.COMBUSTFLAME.2014.08.021
关键词: Spontaneous combustion 、 Combustion 、 Thermodynamics 、 Autoignition temperature 、 Deflagration 、 Homogeneous charge compression ignition 、 Turbulence 、 Homogeneous isotropic turbulence 、 Direct numerical simulation 、 Chemistry
摘要: Abstract In this paper, two- and three-dimensional direct numerical simulations (DNS) of autoignition phenomena in stratified dimethyl-ether (DME)/air turbulent mixtures are performed. A reduced DME oxidation mechanism, which was obtained using rigorous mathematical reduction stiffness removal procedure from a detailed mechanism with 55 species, is used the present DNS. The consists 30 chemical species. This study investigates fundamental aspects turbulence-mixing-autoignition interaction occurring homogeneous charge compression ignition (HCCI) engine environments. isotropic turbulence spectrum to initialize velocity field domain. computational configuration corresponds constant volume combustion vessel inert mass source terms added governing equations mimic pressure rise due piston motion, as practical engines. found be complex three-staged process; each stage distinct kinetic pathway. role reaction generating scalar gradients hence promoting molecular transport processes investigated. By applying diagnostic techniques, different heat release modes igniting mixture identified. particular, contribution autoignition, spontaneous front propagation, premixed deflagration towards total quantified.
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