UNS: Shock Tube Measurements of Aldehyde and Ketone Rate Constants Using Enhanced Laser Absorption

1508748(汉森)这个项目将研究许多常用燃料的基本元素在发动机的典型条件下如何反应。基于激光的光学方法将被用来跟踪这些元素在反应过程中的行为。拟议研究的潜在结果将有助于减少发动机燃烧的排放。PI建议使用激波管研究来解决醛和酮反应，这是一个与新兴生物燃料的燃烧高度相关的主题。醛和酮的排放具有重要的环境和健康后果。在碳氢化合物氧化的早期阶段，这两种物质作为中间体大量形成，如果在完全点火之前燃烧不完全(例如熄火)，发动机可能会大量排放这些物质。先进的基于激光的诊断技术将用于实验研究，包括对甲醛、乙醛和羟基自由基(OH)的激光吸收诊断，以及通过利用量子级联激光器发射的腔增强吸收来确定CO的激光吸收，提供亚ppm的灵敏度。这些测量将利用我们最近开发的增强型、超高灵敏度CO激光吸收诊断，该诊断可以在激波管实验中提供低于ppm的灵敏度。

1508748 (Hanson)This project will investigate how basic elements of many commonly used fuels react under conditions typical in an engine. Laser-based optical methods will be used to track the behavior of these elements during reaction. The potential outcome of the proposed study will help to reduce emissions from engine combustion. The PI proposes to use a shock tube study to address aldehyde and ketone reactions, a topic having high level of relevance to the combustion of emerging biofuels. The emissions of aldehydes and ketones have important environmental and health consequences. Both types of species are formed in significant quantities as intermediates during the early stages of hydrocarbon oxidation, and significant emissions of these species can occur from engines if combustion is incomplete (e.g. quenched) before full ignition. Advanced, laser based diagnostics will be used for the experimental investigation, including laser absorption diagnostics for formaldehyde, acetaldehyde, and hydroxyl radical (OH), and laser absorption determinations for CO by using cavity enhanced absorption with emission from a quantum cascade laser, providing sub-ppm sensitivity. These measurements will take advantage of our recent development of an enhanced, ultra-high-sensitivity CO laser absorption diagnostic that can provide sub-ppm sensitivity in shock tube experiments.