Pinnacle is developing multi-cylinder 1.2 L gasoline engine for automotive applications using high performance computing (HPC) and analysis methods. Pinnacle and Oak Ridge National Laboratory executed large-scale multi-dimensional combustion analyses at the Oak Ridge Leadership Computing Facility to thoroughly explore the design space. These HPC-led investigations show high fuel efficiency (~46% gross indicated efficiency) may be achieved by operating with extremely high charge dilution levels of exhaust gas recirculation (EGR) at a light load key drive cycle condition (2000 RPM, 3 bar BMEP), while simultaneously attaining high levels of fuel conversion efficiency and low NOx emissions. In this extremely dilute environment, the flame propagation event is supported by turbulence and bulk in-cylinder charge motion brought about by modulation of inlet port flow. This arrangement produces a load and speed adjustable amalgamation of swirl and counter-rotating tumble which provides the turbulence required to support stable low-temperature combustion (LTC). At higher load conditions, the engine may operate at more traditional combustion modes to generate competitive power. In this paper, the numerical results from these HPC simulations are presented. Further HPC simulations and test validations are underway and will be reported in future publications.
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机译：Pinnacle正在使用高性能计算（HPC）和分析方法开发用于汽车应用的多缸1.2升汽油发动机。品尼高和橡树岭国家实验室在橡树岭领导力计算设施进行了大规模的多维燃烧分析，以彻底探索设计空间。这些由HPC主导的研究表明，在轻载关键驱动循环条件下（2000 RPM，3 bar BMEP），通过在废气再循环（EGR）的极高充气稀释水平下运行，可以实现较高的燃油效率（总指示效率的46％） ），同时实现高水平的燃料转换效率和低NOx排放。在这种极其稀薄的环境中，湍流和进气口流量的调节所引起的整体缸内充气运动支持了火焰的传播。这种布置产生了负载和速度可调节的涡旋和反向旋转滚珠的融合，从而提供了支持稳定的低温燃烧（LTC）所需的湍流。在更高的负载条件下，发动机可以在更传统的燃烧模式下运行以产生有竞争力的动力。在本文中，提供了这些HPC仿真的数值结果。进一步的HPC模拟和测试验证正在进行中，并将在以后的出版物中进行报道。
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