CAREER: Extinction Phenomena in Turbulent Liquid Dual-Fuel Flames

事业：湍流液体双燃料火焰中的熄灭现象

• 批准号: 2238498
• 负责人: Patton Allison
• 金额: $ 58.96万
• 依托单位: Michigan State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-08-15 至 2028-07-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2238498&HistoricalAwards=false
• 关键词: CAREER; Extinction; Phenomena; Turbulent; Liquid

Turbulent combustion of energy-dense, liquid fuels is at the core of aviation applications. Dual-fuel operation with liquid fuel – hydrogen blends have become a research point of interest. There is limited knowledge from modern experimental studies of complex liquid fuels in highly turbulent reacting flows. The overarching research goal is to investigate extinction-based processes in highly turbulent liquid-fueled flames with hydrogen enrichment and develop new laser diagnostic tools to enable these studies. Educational activities are focused on the addition of combustion physics content to undergraduate and graduate courses and the creation of visual demonstration activities. Learning modules covering combustion and energy science topics will be based on experimental demonstrations designed and built by undergraduate researchers. These demonstrator devices are transportable to classroom settings and outreach engagements. Learning modules will be developed for online sharing, televised delivery with PBS WKAR, and for global access on YouTube.The primary research goal is to investigate extinction-based processes during blowoff at global and local scales in high-Reynolds number, turbulent liquid dual-fuel, hydrogen enriched flames. Particular emphasis will be placed on studying hydrogen enrichment effects on local extinctions in flame structure given varying Le mixtures and potentially inhomogeneous mixing. This study will focus on the dynamics of primarily prevaporized flames in addition to dilute droplet-spray flames, which each have unique dominating thermophysical properties and extinction mechanisms due to interactions between droplets, fuel vapor, turbulence, and flame. The experimental program has been designed to (1) address aspects on coupling between global blowoff transients and local extinction processes, (2) advance new diagnostic methods for CH/formaldehyde PLIF and Rayleigh scattering thermometry in liquid fuel flames, and (3) to capture statistics on flame structure, temperature, scalar dissipation, and curvature that can be incorporated into advanced simulations and modelling via validation-quality datasets. Newly developed diagnostic strategies will be used to observe extinctions in flame structures influenced by turbulence-chemistry interactions due to curvature and Le effects. Measurement of 2-D scalar fields in these flows will provide joint PDF statistics on the temperature, progress variable, and scalar dissipation which has not been experimentally reported for heavier hydrocarbon fuels. The availability of these new tools will allow for insights into previously inaccessible regimes of liquid fuel combustionThis award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

高能量液体燃料的湍流燃烧是航空应用的核心。液体燃料-氢混合物的双燃料运行已成为研究热点。对高度湍流反应流中的复杂液体燃料的现代实验研究了解有限。总体研究目标是研究富氢高湍流液体燃料火焰中基于消光的过程，并开发新的激光诊断工具来实现这些研究。教育活动的重点是在本科生和研究生课程中添加燃烧物理内容以及创建视觉演示活动。涵盖燃烧和能源科学主题的学习模块将基于本科研究人员设计和构建的实验演示。这些演示设备可运输到教室环境和外展活动。将开发学习模块用于在线共享、通过 PBS WKAR 进行电视直播以及在 YouTube 上进行全球访问。主要研究目标是研究全球和局部范围内高雷诺数、湍流液体双燃料、富氢火焰喷出过程中基于灭绝的过程。将特别重点研究氢富集对火焰结构局部消光的影响，考虑到不同的 Le 混合物和潜在的不均匀混合。这项研究将重点关注除稀液滴喷雾火焰之外的主要预汽化火焰的动力学，由于液滴、燃料蒸汽、湍流和火焰之间的相互作用，每种火焰都具有独特的主导热物理性质和消光机制。该实验计划旨在 (1) 解决全局吹气瞬态与局部消光过程之间耦合的问题，(2) 推进液体燃料火焰中 CH/甲醛 PLIF 和瑞利散射测温的新诊断方法，(3) 捕获火焰结构、温度、标量耗散和曲率的统计数据，这些统计数据可以通过验证质量数据集纳入高级模拟和建模。新开发的诊断策略将用于观察由于曲率和 Le 效应而受到湍流化学相互作用影响的火焰结构的消光。对这些流中的二维标量场的测量将提供关于温度、进度变量和标量耗散的联合 PDF 统计数据，这些数据尚未针对较重的碳氢化合物燃料进行实验报告。这些新工具的出现将有助于深入了解以前无法获得的液体燃料燃烧状态。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。