Experimental analysis of combusting flows developing over a plane-symmetric expansion
Experimental analysis of combusting flows developing over a plane-symmetric expansion
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平面对称扩展燃烧流的实验分析
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
B. Deshaies
中科院分区：
文献类型：
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作者：
M. Besson;P. Bruel;J. Champion;B. Deshaies
本文对平面对称膨胀体上的惰性流和燃烧流进行了实验研究。所研究的流动包括：两个完全发展的湍流通道流的空气（惰性流）或空气加丙烷（燃烧流），出现在突然膨胀之前。这样的流动几何形状已被选择来测试湍流燃烧模型，该模型能够考虑可变混合物组成或（和）同时存在的大规模相干结构和随机湍流。本研究关注的情况下，这两个流具有相同的质量流率和相同的当量比。计算结果证实了惯性平均速度场的不对称性。燃烧的存在最显著的影响是平均流场的对称性和伴随着反应区的确定性脉动的相关统计数据，其幅度由反应物流的特性决定。流动特性的这种戏剧性变化对这些流动的计算来说是一个巨大的挑战。
An experimental study of inert and combusting flows developing over a plane-symmetric expansion is presented. The flow under investigation consists :of two fully developed turbulent channel flows of air (inert flows) or air plus propane (combusting flows) that are emerging just ahead of the sudden expansion. Such a flow geometry has been chosen to test turbulent combustion models that are able to take into account either a variable-mixture composition or (and) the simultaneous presence of large-scale coherent structures and stochastic turbuience. The present study concerns cases for which both streams have the same mass flow rate and the same equivalence ratio. The results put into evidence the asymmetry of the inert mean velocity field. The most striking effect of the presence of combustion is the symmetry brought to the mean flowfield and the related statistics accompanied by a deterministic pulsation of the reacting zones whose amplitude is governed by the characteristics of the reactants streams. Such a dramatic change in the flow properties represents a great challenge as far as computations of these flows are concerned.