Collaborative Research: NSF/DOE Partnership on Advanced Combustion Engines: Advancing Low Temperature Combustion and Lean Burning Engines for Light- and Heavy-Duty Vehicles with Mi

Dibble, Robert W. [1258626] Cheng, Wai k .[1258626]本研究项目的目标是通过提供实验数据、仿真工具和对基本现象的理解，帮助实现2025年每加仑54英里的汽车行驶里程目标，以开发下一代高效汽车发动机。我们的目标是扩展清洁高效的低温燃烧（LTC）技术，使其在发动机所需的全负荷和全速范围内运行。主要探索了两种技术途径：1)LTC压缩点火发动机的部分燃料分层（PFS），以及2)火花点火发动机的微波辅助火花塞（µWASP）与PFS相结合。该项目与桑迪亚国家实验室的燃烧研究机构、劳伦斯利弗莫尔国家实验室、劳伦斯伯克利国家实验室、里卡多公司（用于汽车测试）和KAUST清洁燃烧研究中心有重要的合作。在基本层面上，该项目将详细了解导致汽油中压敏热释放和等效比敏感性的化学动力学，这些现象使PFS能够实现高负荷增强的LTC。对于ìWASP技术，该程序将提供火花放电，微波场和火焰核形成过程中分层混合物之间的相互作用的理解。此外，将研究火焰通过分层装药传播的基本物理原理，以获得PFS点火过程的全面描述。这些科学见解将通过基本的现象学模型应用于发动机，以提高发动机效率和降低排放。

Abstract#1258653 / Dibble, Robert W.#1258626 / Cheng, Wai K.The goal of this research project is to help achieve the 54 mile-per-gallon vehicle mileage target (year 2025) by providing experimental data, simulation tools and understanding of fundamental phenomena to develop the next generation of high efficiency engines for vehicles. Our objective is the extension of clean and efficient low temperature combustion (LTC) technology to operate over the full load and speed range required of an engine. Two main two technology paths are explored: 1) partial fuel stratification (PFS) in LTC compression ignition engines, and 2) microwave assisted spark plugs (µWASP) combined with PFS in spark-ignited engines. This program has significant collaboration with the Combustion Research Facility at Sandia National Laboratories, the Lawrence Livermore National Laboratory, the Lawrence Berkeley National Laboratory, Ricardo Inc. ( for automotive testing ), and the Clean Combustion Research Center of KAUST.On a fundamental level, this program will provide detailed understanding of the chemical kinetics that cause pressure-sensitive intermediate temperature heat release and equivalence ratio sensitivity in gasoline, phenomena that enable high load boosted LTC with PFS. For the ìWASP technology, this program will provide understanding of the interactions between the spark discharge, the microwave field and the stratified mixture in the flame kernel formation process. Additionally, the fundamental physics behind flame propagation through a stratified charge will be studied to obtain a comprehensive description of the PFS ignition process. These scientific insights will be applied, through fundamentally based phenomenological models, to engines for improving engine efficiency and lowering emissions.