J056044 乱流平面噴流予混合火炎の三次元火炎構造に対するせん断の影響([J05604]乱流における運動量,熱,物質の輸送現象(4))

概要

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Three-dimensional direct numerical simulations of turbulent plane jet premixed flames with different turbulent intensity and different shear caused by difference of inflow velocity between unburnt and burnt gas have been conducted to investigate shear effects on flame structures of turbulent premixed flames. Detailed kinetic mechanism including 12 reactive species and 27 elementary reactions is considered to represent reactions of hydrogen-air mixture. For weak shear flow case, eddy structure is produced by velocity difference in burnt gases. This difference is caused by inflow burnt gas and produced burnt gas and forms shear flow along the edge of generated OH radical. For strong shear flow case, Kelvin-Helmholtz rollers are induced by the large velocity difference between unburnt and burnt gases, and the rib structures are formed in the braid region. The vortices generated by shear flow distort flame structure in large-scale and the fine scale eddies which are imposed on inflow wrinkle flame front.
一般社団法人日本機械学会の論文
2011-09-11