A Fundamental Study of the Novel Poppet Valve 2-Stroke Auto-ignition Combustion Engine (2-ACE)

近年来，减少燃料消耗和二氧化碳排放的需要已经成为越来越多的关注，以及越来越严格的排放立法。汽车工业和学术界正在进行深入的研究，一方面集中在减少内燃机废气排放的方法上，另一方面集中在节能汽车上。为了满足未来排放和燃油经济性法规的要求，以及客户对更好的扭矩输出和驾驶性能的需求，Brunel和Brighton大学提出了一种新型的提升阀二冲程自动点火发动机。本提案的目的是渗透和理解的关键缸内现象和过程中所涉及的新提出的提升阀二冲程自动点火燃烧发动机。这将使其性能，燃油经济性和废气排放的飞跃式改进的潜力进行评估，与目前的汽油发动机相比。这样的计划需要在发动机技术，计算流体动力学，自燃化学动力学，化学选择性缸内诊断和工业实践的前沿专业知识。拟议的方案涉及四所大学，并得到相关工业公司的支持，采用多学科方法研究下一代汽油发动机的基本工艺和技术。这是第一次提出了一种新颖而详细的方法，以在当前的提升阀发动机中实现显著扩展和更好地控制的自动点火燃烧操作，而没有传统的曲轴箱扫气式端口二冲程发动机的缺陷。单缸提升阀二冲程无凸轮发动机提供了理想的研究工具，实验所提出的方法。此外，新的和新颖的实验技术，如高速缸内残余气体映射和缸内温度成像，将被开发和应用，以获得急需的更好地了解新的内燃机所涉及的基本物理和化学过程。这是通过开发和应用先进的化学CFD发动机模拟与最先进的自燃燃烧预测能力和完善的燃油喷雾和蒸发模型来补充的。为了实现上级二冲程部分负荷燃油经济性和排放，对CAI燃烧进行系统和全面的探索和研究，对于未来开发一种在性能、燃油经济性和排放方面有飞跃性改进的新前沿汽油机是必要的。

Over recent years the need to reduce both fuel consumption and emissions of carbon dioxide has become an increasing preoccupation, as well as ever stringent emission legislation. Intensive research performed by the automotive industry and academia is in progress, centred on ways to reduce exhaust emissions from IC engines on the one hand, and fuel efficient vehicles on the other. Fast progress in meeting future emission and fuel economy regulations has been hampered by the commonly accepted trade-offs between reduction in exhaust emissions and improvements in fuel economy, as well as by the customers demand for better torque output and driveability.A novel poppet valve 2-stroke controlled auto-ignition combustion engine has been proposed by Brunel and Brighton Universities. The purpose of this proposal is to penetrate and understand the key in-cylinder phenomena and processes involved in the newly proposed poppet valve 2-stroke auto-ignition combustion engine. This will enable the assessment of its potential for leapfrog improvements in performance, fuel economy, and exhaust emissions, as compared to current gasoline engines. Such a programme demands leading-edge expertise in engine technology, computational fluid dynamics, autoignition chemical kinetics, chemically selective in-cylinder diagnostics, and industrial practice. The proposed programme involves four universities supported by relevant industrial companies, taking a multi-disciplinary approach to the study of the underlying processes and technologies for the next generation of gasoline engines. It is the first time that a novel and detailed methodology has been proposed to achieve significantly extended and better controlled auto-ignition combustion operation in the current poppet valved engine without the pitfalls of the traditional crankcase scavenged ported two-stroke engines. The single cylinder poppet valve 2-stroke camless engine offers the ideal research tool to experiment with the proposed methodology. In addition, new and novel experimental techniques, such as the high-speed in-cylinder residual gas mapping and in-cylinder temperature imaging, are to be developed and applied to obtain the much-needed better understanding of underlying physical and chemical processes involved in the new combustion engine. This is complemented by the development and application of sophisticated chemistry CFD engine simulation with the state-of-the-art autoignition combustion prediction capability and refined fuel spray and evaporation models. Such a systematic and comprehensive programme of exploration and research on CAI combustion for achieving superior 2-stroke part-load fuel economy and emissions is imperative for the future development of a new frontier gasoline engine with leapfrog improvements in performance, fuel economy, and exhaust emissions.