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Prediction of the combustion process and emission formation of a bi-fuel s.i. engine

机译：双燃料s.i的燃烧过程和排放形成的预测发动机

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A thermodynamic model is developed and validated for the prediction of the combustion process and pollutant formation in s.i. engines, fuelled by gasoline and compressed natural gas. Attention is focused on the main physical and chemical phenomena to allow a reliable evaluation of the burning rate and of the specie concentrations, including intermediates such as CO, O, H, and OH. A new correlation for laminar flame speed of methane-air mixtures is derived by interpolating more than 1000 different conditions at high pressure and temperature, computed by a detailed chemical approach. Successively an extended dissertation about the fundamental mechanisms which govern the pollutant formation in the turbulent premixed combustion which characterizes the s.i. engines is given. The conclusion of such analysis is the definition of a new reduced chemical scheme, based on the application of partial-equilibrium and steady-state assumptions for the radicals and the solution of a transport equation for each specie which is kinet-ically controlled. Finally the proposed schemes and formulations were embedded into the developed quasi-D model and into a CFD code, to simulate a s.i. engine fuelled by gasoline and CNG, allowing a deeper understanding of the reliability of the simplifications made in the quasi-dimensional model and a comprehensive investigation of several physical and chemical properties, whose experimental measurement is not usually available. Computed results were compared with the available experimental data of in-cylinder pressure histories and engine emissions for two different engine configurations.
机译：开发并验证了热力学模型以预测s.i中的燃烧过程和污染物形成。汽油和压缩天然气为燃料的发动机。应将注意力集中在主要的物理和化学现象上，以便可靠地评估燃烧速率和物种浓度，包括诸如CO，O，H和OH之类的中间体。甲烷-空气混合物的层流火焰速度的新相关性是通过在高压和高温下内插超过1000种不同条件（通过详细的化学方法计算得出）得出的。继而扩展了关于控制湍流预混合燃烧中污染物形成的基本机理的扩展论文，该机理表征了s.i。给出了引擎。这种分析的结论是基于对自由基的部分平衡和稳态假设的应用以及对每个受动力学控制的物质的迁移方程的求解，从而定义了一种新的还原化学方案。最后，将拟议的方案和公式嵌入已开发的准D模型和CFD代码中，以模拟s.i。由汽油和压缩天然气为燃料的发动机，可以更深入地了解准尺寸模型中简化的可靠性，并且可以对几种物理和化学性质进行全面研究，而通常无法进行实验测量。将计算结果与两种不同发动机配置的缸内压力历史记录和发动机排放的可用实验数据进行了比较。

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