Direct numerical simulations of probe effects in low-pressure flame sampling
Direct numerical simulations of probe effects in low-pressure flame sampling
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DOI：
10.1016/j.proci.2014.06.046
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
V. Gururajan;F. Egolfopoulos;K. Kohse-Höinghaus
中科院分区：
文献类型：
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作者：
V. Gururajan;F. Egolfopoulos;K. Kohse-Höinghaus
使用侵入式采样和分子束质谱分析对低压火焰进行形态研究对于开发和验证燃烧模型至关重要。为了评估潜在的探针诱导效应，使用有限体积完全可压缩代码以及化学动力学和分子传输的详细描述对实际实验配置进行了直接数值模拟。对 50 毫巴富丙烯/氧气/氩气火焰进行了建模，并提供了实验数据。评估了探头和支撑法兰、非绝热性、采样位置以及通过采样孔抽吸时的可压缩性的影响。结果表明，即使在绝热条件下，探头法兰组件的存在也会影响二维流场。此外，发现采样位置的热损失和压缩性的影响非常显着。燃料氧化的重要自由基（例如 OH 和 HCO）以及碳烟形成的重要自由基（例如 C3H3）会受到采样程序的影响，并且与未受干扰的一维火焰相比，它们在采样位置的浓度可能显着不同。
Speciation studies of low-pressure flames using intrusive sampling and molecular beam mass spectrometry analysis are essential towards developing and validating combustion models. In order to assess potential probe-induced effects, direct numerical simulations of a realistic experimental configuration were carried out using a finite-volume fully compressible code as well as detailed descriptions of chemical kinetics and molecular transport. A 50 mbar rich propene/oxygen/argon flame was modeled for which experimental data are available. The effects of the probe and supporting flange, non-adiabaticity, sampling location, and compressibility when there is suction through the sampling orifice were assessed. Results showed that even under adiabatic conditions, the presence of the probe-flange assembly affects the flow field two-dimensionally. Furthermore, the effects of heat loss and compressibility were found to be significant at the sampling location. Important radicals for fuel oxidation such as OH and HCO, and for soot formation such as C3H3are affected by the sampling procedure and their concentrations at the sampling location can differ notably compared to unperturbed one-dimensional flames.