The Chemistry Controlling the Homogeneous Charge Compression Ignition (HCCI) Combustion Process

本文研究了均质充量压缩着火（HCCI）过程的反应机理和化学途径。 单组分燃料和2至5种不饱和烃的混合物使用德雷克塞尔加压流反应器设施和相关的气体分析仪器进行了研究。 一套分析技术用于鉴定和定量稳定的反应中间体和产物。 具体目标包括：产生详细的化学物种演变概况，作为燃料大小和结构、氧浓度、温度和压力的函数;分离相关的途径和机制;发展详细的和简化的化学动力学模型;以及探索用于控制HCCI过程的可能的化学方法。均质充量压缩点火（HCCI）发动机，20年前由日本工程师提出，目前正在积极考虑下一代汽车。 它提供了高效率（高油耗）和清洁燃烧（低NOx和颗粒物）的潜力。 然而，该过程还没有被很好地理解，并且真实的系统具有稳定性和燃料优化的问题。

This is a study of reaction mechanisms and chemical pathways relevant to the homogeneous charge compression ignition (HCCI) process. Single-component fuels and mixtures of 2 to 5 species of unsaturated hydrocarbons are investigated using the Drexel Pressurized Flow Reactor Facility and associated instrumentation for gas analysis. A suite of analytical techniques is used to identify and quantify the stable reaction intermediates and product species. Specific objectives include the production of detailed chemical species evolution profiles as functions of fuel size and structure, oxygen concentration, temperature, and pressure; the isolation of relevant pathways and mechanisms; the development of detailed and reduced chemical kinetic models; and the exploration of possible chemical methods for controlling the HCCI process.The homogeneous charge compression ignition (HCCI) engine, proposed 20 years ago by Japanese engineers, is under active consideration for next generation vehicles. It offers the potential for both high efficiency (high gas mileage) and clean burning (low NOx and particulates). However, the process is not well understood and real systems have problems of stability and fuel optimization.