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仪器网/ 行业应用/ 解决方案/ 烟尘形态法研究线涡内的平面扩散火焰

烟尘形态法研究线涡内的平面扩散火焰

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An experimental study of the interaction of a planar diffusion flame with a line vortex is presented. A planar
diffusion flame is established between two coflowing, equal velocity streams of acetylene diluted with nitrogen
and air. A line vortex is generated on demand by momentarily pulsing one of the flow streams by way of electromagnetic
actuation of a piston in the flow apparatus. The flamevortex interactions are diagnosed by planar
laser-induced incandescence for soot yield and by particle image velocimetry for vortex flow characterization. The
results show that soot formation and distribution are influenced by the reactant streams from which vortices are
initiated. The vortices interacting with the flame from the air side produce more soot and soot is distributed in and
around the vortex core in diffuse layers. In contrast, topography of soot in vortices interacting from the fuel side
is such that soot is confined to thinner layers around the vortex core which does not contain any soot. The flame
curvature is found to influence the local soot production with the flame regions convex to the fuel side containing
more soot locally. It is also found that the overall soot yield is less sensitive to the vortex strength and is of lower
magnitude when vortex is spun from the fuel side. The knowledge of this type of asymmetry in soot yield in
flamevortex interactions is useful for combustion engineering and design of practical devices. 德国LaVision PIV/PLIF粒子成像测速场仪 PLIF平面激光诱导荧光火焰燃烧检测系统 激光诱导白炽光烟雾粒子成像分析仪(LII)
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