Autoignition of Primary Reference Fuels and Blends with Ethanol and Dimethly Ether

1404026 Seshardri，Kalyanasundaram标题：一级参考燃料和乙醇与二甲醚混合物的自燃燃烧在许多工业和工程应用中很重要，如汽车发动机和发电厂。 这项研究的目标是提供科学知识，这将有助于开发设计发动机所需的技术，有效利用化石燃料和二氧化碳中性运输燃料。 所提出的努力涉及两个实验，其结果的理论/数学分析的点火现象可以验证。 参与该项目的研究生为国家的STEM（科学、技术、工程和数学）工作队伍做出了贡献。自燃是所有长链烃和一些含氧燃料在发动机中发生时的固有属性。 发动机的有效运行关键取决于此属性。 一个全面的实验，计算和分析研究将进行的目标是获得一个基本的理解，自燃的正庚烷，异辛烷，乙醇，二甲醚，在层流非预混流。 选择烷烃正庚烷和异辛烷是因为它们被指定为主要参考燃料，并被认为是柴油和汽油的替代品。将测量自燃的临界条件。 将使用详细的化学进行计算。 研究的一个重要部分将致力于采用率比渐近技术，以获得可用于预测自燃的解析表达式。预计的关键成果是，自燃的燃料，测试化学动力学机制的实验数据，并预测自燃在中间和高温制度，可用于计算流体动力学代码的分析表达式。这项研究将提供一个明确的基本理解自燃作为一个链支化/链断裂过程，其中涉及的特定的自由基在不同的温度制度的燃料的竞争。 该研究为自燃分析提供了新的数学方法。这些技术有其边界层理论和奇异摄动分析的基础。 在流体力学、热科学和化学科学等领域的分析问题中有着广泛的应用前景。

1404026Seshardri, KalyanasundaramTitle: Autoignition of Primary Reference Fuels and Blends with Ethanol and Dimethly EtherCombustion is important in many industrial and engineering applications, such as automotive engines and power plants. The goal of this research is to provide scientific knowledge that will be useful for developing the technology required for designing engines that make efficient use of fossil fuels and carbon-dioxide-neutral transportation fuels. The proposed effort involves both experiments, with whose results theoretical/mathematical analysis of the ignition phenomena can be validated. Graduate students working on the project contribute to the nation's STEM (science, technology, engineering, and mathematics) work force.Autoignition is an inherent property of all long-chain hydrocarbons and some oxygenated fuels as they occur in engines. Efficient operation of engines depends crucially on this property. A comprehensive experimental, computational and analytical study will be carried out with the goal of obtaining a fundamental understanding of autoignition of n-heptane, iso-octane, ethanol, dimethyl ether, in laminar non-premixed flows. The alkanes n-heptane and iso-octane are selected because they are designated as primary reference fuels and are considered as surrogates of Diesel and gasoline. Critical conditions of autoignition will be measured. Computations will be performed using detailed chemistry. A significant part of the research will be devoted to employing rate-ratio asymptotic techniques to obtain analytical expressions that can be used to predict autoignition. The key outcomes are expected to be, experimental data on autoignition for the fuels, tested chemical kinetic mechanisms, and analytical expressions for predicting autoignition in the intermediate and high temperature regimes that can be employed in computational fluid dynamic codes. The research will provide a clear fundamental understanding of autoignition as a chain-branching/chain-breaking process which involves the competition of the fuels for specific radicals in different temperature regimes. The research will provide new mathematical techniques for analyzing autoignition. These techniques have their foundation in boundary layer theory and singular perturbation analysis. Therefore they are expected to have a much wider use in analyzing problems in fluid mechanics, thermal sciences and chemical sciences.