Numerical Modeling of the Turbulent Spark Ignition Dynamics of Gasoline Surrogates at Fuel-Lean, High Pressure, High Temperature Conditions

本研究项目的科学目的是对汽油替代品(即异辛烷、正庚烷、甲苯)的湍流火花点火机理进行数值模拟。重点研究了与火花点火发动机运行条件相关的贫油、高压、高温条件，以及在湍流强度和层流燃烧速度的很大范围内，近各向同性湍流中接近最小点火能量(MIE)的火花能量。由此获得的知识将有助于理解在稀油条件下运行的点燃式发动机经常观察到的缓慢燃烧、失火和部分燃烧循环。该项目将基于不同成分的分层建模概念：详细的数值模拟，化学动力学复杂性的简化方法，以及湍流-化学相互作用的统计方法。这一建议被嵌入到联合项目(MOST-DFG联合研究项目)的呼吁中。台湾合作伙伴(国立中央大学S.Shy教授)将对汽油替代品的点火进行实验研究。

The scientific aim of this research project is to numerically model turbulent spark ignition mechanisms of gasoline surrogates (i.e. iso-octane, n-heptane, toluene). The focus is on fuel-lean, high pressure, high temperature conditions as relevant to spark ignition (SI) engine operation conditions, and on spark energies near the minimum ignition energy (MIE), in near-isotropic turbulence over a wide range of values of turbulence intensity and laminar burning velocity. The resulting knowledge will help understanding the slow burning, misfire, and partial burn cycles frequently observed in SI engines operated at fuel-lean conditions. The project will be based on a hierarchical modeling concept with different ingredients: detailed numerical simulations, a reduction methodology for the complexity of the chemical kinetics, and a statistical approach for the turbulence-chemistry interaction.This proposal is imbedded in the call for joint projects (MOST-DFG Joint Research Projects). The Taiwanese partner (Prof. S. Shy, National Central University) will perform experimental investigations of the ignition of gasoline surrogates.