Combustion of a charge with spatially and temporally varying equivalence ratio in a spark ignition engine was modelled using the Leeds University Spark Ignition Engine quasi-dimensional thermodynamic code. New sub-models have been integrated into Leeds University Spark Ignition Engine that simulate the effect of burnt gas expansion and turbulent mixing on an initial equivalence ratio distribution. Realistic distribution functions were used to model the radially varying equivalence ratio. The new stratified fuel model was validated against experimental data, showing reasonable agreement for both the pressure trace and percentage heat released. Including the effect of turbulent mixing was found to be important to reproduce the trend in the differences between the stratified and homogeneous simulations.

中文翻译：

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分层充量火花点火发动机的热力学建模

使用利兹大学火花点火发动机准维热力学代码模拟火花点火发动机中具有随空间和时间变化的当量比的装料的燃烧。新的子模型已集成到利兹大学 Spark Ignition Engine 中，用于模拟燃烧气体膨胀和湍流混合对初始当量比分布的影响。现实分布函数用于模拟径向变化的当量比。新的分层燃料模型根据实验数据进行了验证，表明压力轨迹和释放的热量百分比具有合理的一致性。发现包括湍流混合的影响对于重现分层模拟和均质模拟之间差异的趋势很重要。