Due to increasingly strict global emission regulations and energy conservation policies, gasoline engines are facing significant challenges. Achieving high efficiency and ultra-low emissions in gasoline engines has become a critical technical challenge that requires attention. Pre-chamber (PC) Turbulent Jet Ignition (TJI) is a highly promising technology for improving thermal efficiency and reducing emissions in gasoline engines. This study employs a three-dimensional flow simulation analysis combined with a detailed chemical reaction mechanism. The investigation is based on eight distinct passive PC structural configurations. The effects of various structural parameters, including the orifice number (ON), orifice axis angle (OAA), orifice diameter (OD), and volume ratio (VR), on the in-cylinder combustion process and emission characteristics are investigated, in which the formation of the fire nucleus and the propagation of the flame are intensively involved. The investigation is conducted under equivalence ratio working condition. Among these, the ITE of the best configuration is relatively 5.46% higher than the baseline engine. The combustion duration decreased by 55.95% to 7.4 °CA compared to the baseline engine, while particulate soot emissions also decreased by 51.22%.

中文翻译：

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被动预燃室关键结构参数对汽油机缸内燃烧过程和排放的影响

由于全球排放法规和节能政策日益严格，汽油发动机面临着重大挑战。实现汽油发动机的高效率和超低排放已成为需要关注的关键技术挑战。预燃室 (PC) 湍流喷射点火 (TJI) 是一项非常有前景的技术，可提高汽油发动机的热效率并减少排放。本研究采用三维流动模拟分析并结合详细的化学反应机理。该调查基于八种不同的无源 PC 结构配置。研究了节流孔数量（ON）、节流孔轴角（OAA）、节流孔直径（OD）和容积比（VR）等各种结构参数对缸内燃烧过程和排放特性的影响，其中火核的形成和火焰的传播密切相关。调查是在当量比工况下进行的。其中，最佳配置的ITE比基准发动机相对高出5.46%。与基准发动机相比，燃烧持续时间减少了 55.95%，达到 7.4 °CA，同时颗粒烟尘排放也减少了 51.22%。