An improved study of the uniformity of laminar premixed flames using laser absorption spectroscopy and CFD simulation
An improved study of the uniformity of laminar premixed flames using laser absorption spectroscopy and CFD simulation
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利用激光吸收光谱和 CFD 模拟改进层流预混火焰均匀性研究
DOI：
10.1016/j.expthermflusci.2019.110013
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发表时间：
2020-04
影响因子：
3.2
通讯作者：
Ren Wei
中科院分区：
文献类型：
--
作者：
Ma Liuhao;Cheong Kin-Pang;Ning Hongbo;Ren Wei
我们进行了一个标准的麦肯纳燃烧器的火焰均匀性的实验和数值研究相结合的空间分辨的温度和物种浓度在层流甲烷/空气预混火焰。在实验中，多波长激光吸收光谱（LAS）用于原位，非侵入性，定量测量温度，H2O和CO2。在模拟中，计算流体动力学（CFD）模拟进行建模的火焰的热化学结构。通过改变并流率、当量比（Φ = 0.8-1.2）和反应物流的雷诺数来比较LAS测量和CFD模拟。总的来说，所有的模拟都与实验数据比较吻合。实验结果表明，火焰温度和H2O/CO2浓度的径向分布基本一致，但存在一定的不均匀性，在使用标准火焰进行燃烧研究时应注意这一点。特别是，火焰的均匀性可以通过增加反应物流的雷诺数或降低并流率来改善。
We performed a combined experimental and numerical study of the flame uniformity for a standard McKenna burner by investigating the spatially-resolved temperature and species concentrations in laminar CH4/air premixed flames. In the experiment, multi-wavelength laser absorption spectroscopy (LAS) was employed forin situ, non-intrusive, and quantitative measurements of temperature, H2O and CO2. In the simulation, computational fluid dynamics (CFD) simulations were performed to model the thermochemical structures of the flames. The LAS measurements and CFD simulations were compared by varying the co-flow rate, equivalence ratio (Φ = 0.8–1.2), and the Reynolds number of the reactant flow. In general, all the simulations were in relatively good agreement with the experimental data. We observed that the flame temperature and H2O/CO2concentrations have almost the identical radial distributions with a certain non-uniformity, which should be carefully considered when using the standard flame for combustion research. In particular, the flame uniformity could be improved by increasing the Reynolds number of reactant flow or reducing the co-flow rate.
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