Assessing Jet-Induced Spatial Mixing in a Rich, Reacting Crossflow
Assessing Jet-Induced Spatial Mixing in a Rich, Reacting Crossflow
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评估丰富的反应横流中射流引起的空间混合
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
J. Holdeman
中科院分区：
文献类型：
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作者：
T. Demayo;M. Leong;G. Samuelsen;J. Holdeman
在许多先进的低NOx燃气涡轮机燃烧技术中，如富燃/快速混合/贫燃（RQL）燃烧技术中，在反应的、热的、富燃料的气流中的射流混合在最小化所有污染物排放和最大化燃烧效率方面起着重要作用。评估混合程度和预测射流穿透是优化射流注射设计策略的关键。不同的被动标量，包括碳，氧和氦，进行比较，以量化在大气RQL燃烧钻机反应条件下的混合。结果表明，基于O 2的射流混合物分数低估了基于C的混合物分数，由于射流稀释和燃烧，而He示踪剂高估它可能是由于密度和扩散率的差异。He方法在混合物分数数据中也表现出显著的分散性，这很可能归因于气体密度和湍流扩散率的差异。射流混合分数的数据被用来评估平面空间的不混合，这表明所有三个标量的良好协议。研究表明，在进一步的技术改进下，可以用O2或He示踪剂代替C来测定RQL燃烧室中的反应和混合程度。
In many advanced low NO x gas turbine combustion techniques, such as rich-burn/quick-mix/lean-burn (RQL), jet mixing in a reacting, hot, fuel-rich crosse ow plays an important role in minimizing all pollutant emissions and maximizing combustion efe ciency. Assessing the degree of mixing and predicting jet penetration is critical to the optimization of the jet injection design strategy. Different passive scalar quantities, including carbon, oxygen, and helium, are compared to quantify mixing in an atmospheric RQL combustion rig under reacting conditions. The results show that the O 2-based jet mixture fraction underpredicts the C-based mixture fraction due to jet dilution and combustion, whereas the He tracer overpredicts it possibly due to differences in density and diffusivity. The He method also exhibits signie cant scatter in the mixture fraction data that can most likely be attributed to differences in gas density and turbulent diffusivity. The jet mixture fraction data were used to evaluate planar spatial unmixedness, which showed good agreement for all three scalars. This investigation suggests that, with further technique ree nement, either O 2 or a He tracer could be used instead of C to determine the extent of reaction and mixing in an RQL combustor.