Large eddy simulation and experiments of stratified lean premixed methane/air turbulent flames
作者： K-J Nogenmyr , Per Petersson , Xue-Song Bai , A Nauert , Jimmy Olofsson
DOI: 10.1016/J.PROCI.2006.08.038
关键词:
摘要: This paper presents a joint large eddy simulation and laser diagnostic investigation of premixed turbulent low swirl flames. A lean methane/air mixture, the equivalence ratio 0.60-0.66, is injected from 50 mm diameter burner to speed co-flowing air at room temperature pressure. The level-set G-equation employed simulate inner layer flame front. Flamelet chemistry used determine properties in reactive zones. Mixing heat transfer post-flame zone down-stream are modeled using transport equations. In addition simulation, simultaneous 2-D induced fluorescence OH particle image velocimetry characterize basic structure. Laser Doppler further analyze flow velocity along central axis above burner, filtered Rayleigh scattering measure field lower part flame. bowl-shaped, highly wrinkled stabilized position about one-half burner. consists two distinct parts; around axis, with uniform mixture fraction region by inflow swirl; off stratified found shear field. Flame holes (local extinction) owing overly mixtures observed off-axis unified developed model holes. structure simulations compared measurements; height stabilization (lift-off height), mean profile, axial radial components together rms fairly good agreement measurement data. © 2006 Combustion Institute. Published Elsevier Inc. All rights reserved. (Less)
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