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首页> 外文会议>International Symposium on Combustion; 20060805-11; University of Heidelberg(DE) >An experimental investigation of flame propagation through a turbulent stratified mixture
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An experimental investigation of flame propagation through a turbulent stratified mixture

机译：火焰通过湍流分层混合物传播的实验研究

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Propagation of a propane/air flame is investigated through a spatially stratified mixture and turbulent flows. An unsteady jet is injected in a constant volume chamber to generate a turbulent flow and a mixture stratification. The flame is spark-ignited in a near stoichiometric mixture and then propagates towards lean mixtures. Simultaneous particle image velocimetry (PIV) and laser induced fluorescence (LIF) measurements are performed to study flame propagation. These measurements provide instantaneous velocity and equivalence ratio fields enabling conditioned measurements in the region ahead of the flame front. Quantitative equivalence ratio measurements are obtained from the fluorescence of a molecular tracer seeding propane by a method based on oxygen quenching of the excited state. The flame is submitted to large-scale and small-scale variations of mixture in a turbulent flow. The flame is ignited on the jet axis and propagates towards the jet boundary. To isolate the effects of mixture stratification from those of turbulence, flame propagation is also investigated for the same aerodynamic jet conditions, but with three different homogeneous mixtures. First, the global enhancement of flame propagation, thanks to mixture stratification, is demonstrated from analysis of the tomography images compared to flame behavior in homogeneous mixtures. Second, the pdfs of local burning velocity conditioned on the local equivalence ratio are obtained and compared with the homogeneous case. These results show that in a turbulent flame, the local burning velocity can increase or decrease depending on the local mixture and mixture distribution along the flame front.
机译：通过空间分层混合物和湍流研究丙烷/空气火焰的传播。将不稳定的射流注入恒定体积的腔室中，以产生湍流和混合物分层。火焰在接近化学计量的混合物中被火花点火，然后向稀薄混合物传播。同时进行粒子图像测速（PIV）和激光诱导荧光（LIF）测量以研究火焰传播。这些测量提供了瞬时速度和当量比场，从而可以在火焰前沿之前的区域中进行条件测量。通过基于激发态的氧猝灭的方法，从分子示踪剂注入丙烷的荧光获得定量当量比测量值。火焰经受湍流中混合物的大规模和小规模变化。火焰在喷流轴上点燃并向喷流边界传播。为了将混合物分层的影响与湍流的影响隔离开来，还针对相同的空气动力学喷射条件，但使用三种不同的均质混合物，研究了火焰传播。首先，与均匀混合物中的火焰行为相比，通过层析成像图像的分析证明了由于混合物分层，火焰传播的整体增强。其次，获得以局部当量比为条件的局部燃烧速度的pdf，并将其与均质情况进行比较。这些结果表明，在湍流火焰中，局部燃烧速度会根据局部混合物和混合物沿火焰前沿的分布而增加或减少。

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