基于三方程多环芳烃烟尘生成模型的小火焰/传输PDF模拟乙烯/空气射流湍流非预混火焰

IF 1.9 4区工程技术 Q4 ENERGY & FUELS

Combustion Theory and Modelling Pub Date : 2023-06-20 DOI:10.1080/13647830.2023.2224755

F. Nmira, Antoine Bouffard, J. Consalvi

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引用次数: 0

摘要

本文报道了在桑迪亚实验研究的乙烯/空气湍流非预混射流火焰的小火焰/传输PDF（TPDF）模拟。采用随机欧拉场方法求解传输PDF方程。烟尘产生是通过一个经过验证的基于PAH的三方程烟尘模型进行建模的，该模型预测了低计算时间下的平均烟尘聚集特性，并包括烟尘产生过程的详细描述。使用秩相关全谱k模型对气体和烟尘辐射进行建模。湍流/化学/烟尘产生/辐射相互作用通过PDF方法考虑在内。通过考虑或不考虑烟灰差异混合来运行模拟。根据直接数值模拟的最新结论（Zhou et al.，Proc.Combsut.Inst.38（2021）2731–2739），由于混合时间尺度足够大，通过忽略烟灰混合来模拟烟灰差分混合。当考虑烟灰差分混合时，模型预测在不调整参数的情况下合理地再现了详尽的实验数据集，包括火焰结构、烟灰统计和辐射输出。特别是，预测首次证明了RANS/TPDF模型捕捉煤烟间歇性的能力。另一方面，忽略煤烟差异混合会显著降低平均和波动的煤烟体积分数以及煤烟间歇性。散点图分析表明，在混合物分数空间的区域中，烟灰表面生长和烟灰氧化主导了烟灰的产生，烟灰差异混合的影响更为明显，以不可忽略的方式影响这些过程。相反，烟灰成核和PAH冷凝受到的影响要小得多。模型结果还表明，忽略煤烟差异混合会降低平均煤烟排放以及煤烟排放湍流/辐射相互作用。

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Flamelet/transported PDF simulations of ethylene/air jet turbulent non-premixed flame using a three-equation PAH-based soot production model

This article reports flamelet/transported PDF (TPDF) simulations of the well-documented ethylene/air turbulent non-premixed jet flame investigated experimentally at Sandia. The transported PDF equation is solved with the Stochastic Eulerian Field method. The soot production is modelled by a validated three equation PAH-based soot model that predicts the mean soot aggregate properties at low computational time and includes a detailed description of the soot production processes. Gas and soot radiation is modelled using the rank-correlated full-spectrum k model. The turbulence/chemistry/soot production/radiation interactions are taken into account by means of the PDF method. Simulations are run by considering or not soot differential mixing. Based on recent conclusions drawn from Direct Numerical Simulations (Zhou et al., Proc. Combsut. Inst. 38 (2021) 2731–2739), soot differential mixing is modelled by neglecting soot mixing owing to sufficiently large mixing timescales. When soot differential mixing is considered, model predictions reproduce reasonably well the exhaustive set of experimental data, including flame structure, soot statistics and radiative outputs without adjusting parameters. In particular, the predictions demonstrate for the first time the capability of RANS/TPDF models to capture the soot intermittency. On the other hand, neglecting the soot differential mixing produces notable reductions in mean and fluctuating soot volume fraction and soot intermittency. Scatter plot analysis shows that the effects of soot differential mixing are more pronounced in regions of the mixture fraction space where soot surface growth and soot oxidation dominate the soot production, affecting these processes in a non-negligible manner. In an opposite way, soot nucleation and PAH condensation are much less significantly affected. Model results show also that disregarding soot differential mixing reduces the mean soot emission as well the soot emission turbulence/radiation interaction.

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来源期刊

Combustion Theory and Modelling 工程技术-工程：化工

CiteScore

3.00

自引率

7.70%

发文量

审稿时长

6 months

期刊介绍： Combustion Theory and Modelling is a leading international journal devoted to the application of mathematical modelling, numerical simulation and experimental techniques to the study of combustion. Articles can cover a wide range of topics, such as: premixed laminar flames, laminar diffusion flames, turbulent combustion, fires, chemical kinetics, pollutant formation, microgravity, materials synthesis, chemical vapour deposition, catalysis, droplet and spray combustion, detonation dynamics, thermal explosions, ignition, energetic materials and propellants, burners and engine combustion. A diverse spectrum of mathematical methods may also be used, including large scale numerical simulation, hybrid computational schemes, front tracking, adaptive mesh refinement, optimized parallel computation, asymptotic methods and singular perturbation techniques, bifurcation theory, optimization methods, dynamical systems theory, cellular automata and discrete methods and probabilistic and statistical methods. Experimental studies that employ intrusive or nonintrusive diagnostics and are published in the Journal should be closely related to theoretical issues, by highlighting fundamental theoretical questions or by providing a sound basis for comparison with theory.