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必要性日益成为当务之急，排放立法也越来越严格。汽车行业和学术界正在进行密集的研究，一方面集中在减少内燃机废气排放的方法上，另一方面则集中在节油汽车上。在满足未来排放和燃油经济性法规方面的快速进展受到了普遍接受的在减少废气排放和改善燃油经济性之间的权衡，以及客户对更好的扭矩输出和驾驶性能的需求的阻碍。布鲁内尔大学和布莱顿大学提出了一种新型的锥阀二冲程控制汽车点火内燃机。这项建议的目的是深入了解新提出的锥阀二冲程自动点火内燃机所涉及的关键缸内现象和过程。这将使其能够评估与目前的汽油发动机相比，其在性能、燃油经济性和尾气排放方面的跨越式改进潜力。这样的项目需要发动机技术、计算流体动力学、自动点火化学动力学、气缸内化学选择性诊断和工业实践方面的尖端专业知识。拟议的计划涉及四所大学，得到相关工业公司的支持，采取多学科方法研究下一代汽油发动机的基本工艺和技术。这是首次提出了一种新颖而详细的方法，以在现有的锥阀发动机上实现显著延长和更好地控制自燃燃烧，而不存在传统曲轴箱扫气二冲程发动机的缺陷。单缸锥阀二冲程无凸轮发动机为试验所提出的方法提供了理想的研究工具。此外，还将开发和应用新的和新颖的实验技术，如高速缸内残余气体测绘和缸内温度成像，以更好地了解新内燃机所涉及的基本物理和化学过程。此外，还开发和应用了先进的化学CFD发动机模拟，具有最先进的自燃燃烧预测能力和改进的燃油喷雾和蒸发模型。为实现二冲程部分负荷燃油经济性和排放的优异性能，开展这样一项系统而全面的探索和研究方案，对于未来开发性能、燃油经济性和排放都有跨越式提高的新型前沿汽油机是十分必要的。

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.