AI 中文总结
本研究结合实验与OpenSMOKE++数值模拟，探究1-6 bar压力对等扩散对向流扩散火焰soot结构的影响，发现soot浓度随压力升高而增加，乙炔为碳传递关键节点，其影响力随压力增大。
AI 中文摘要
本研究结合实验与数值模拟，探究了压力（范围为1 bar至6 bar）对等扩散对向流扩散火焰（counterflow diffusion flame, CDF）中等扩散 soot 形成（soot formation, SF）的化学 soot 结构的影响。实验在压力升高时保持扩散火焰结构和碳通量不变，测量了 soot 浓度、色散指数和 soot 生成速率。数值模拟在OpenSMOKE++中完成，采用了详细的\u03b1-C1-\u03b1-C16化学机理、集中多环芳烃（PAH）考虑（最高至\ue000C160）、分段soot模型，并跟踪了颗粒中碳氢（C/H）比。研究中还使用基于网络的工具分析碳传递路径的组织与演化。结果表明，对等扩散火焰而言，soot浓度随停留时间和压力升高而增加，而soot生成速率仅受压力影响；数值与实验方法均观察到soot的C/H比随压力升高而增大，但数值模拟低估了氢提取反应的增幅。在soot成核前，soot形成网络的路径呈现类渗流的组织形式，之后通过添加关键节点的连接持续生长；乙炔被确定为碳传递图中极具影响力的节点，其影响力随压力升高而增大。
英文摘要
The effects of pressure on the chemical sooting structure of equi-diffusive soot formation (SF) in a counterflow diffusion flame (CDF) are explored in a combined experimental and numerical study over pressures ranging from 1 bar to 6 bar. Experiments preserve the diffusive flame structure and carbon flux at increasing pressures and utilize measurements of soot concentrations, dispersion exponents and soot production rates. Numerical simulations are completed in OpenSMOKE++ with detailed \ce{C1}-\ce{C16} chemistry, lumped PAH consideration up to \ce{C160}, sectional soot model and tracking of the C/H ratio in particulates. Network-based tools are utilized to study the organization and evolution of carbon routing pathways. Results show that for equi-diffusive flames, soot concentration increases with residence time and pressure, whereas soot production rates are influenced only by pressure. Soot C/H ratio is observed to increase with pressure using numerical and experimental methods, but numerical solutions underestimate the increase in hydrogen abstraction reactions. The soot-forming network undergoes a percolation-like organization of its pathways before soot inception. The network then continues to grow by adding connections through its influential nodes. Acetylene is identified as a highly influential node in the carbon transfer graph, with its influence increasing with pressure.
Commentsaccepted for publication in the Proceedings of the Combustion Institute, Vol. 42
