CAREER: Extinction Phenomena in Turbulent Liquid Dual-Fuel Flames

高能量液体燃料的湍流燃烧是航空应用的核心。采用液态燃料-氢混合物的双燃料运行已成为人们感兴趣的研究热点。现代实验研究复杂的液体燃料在高度湍流反应流的知识有限。首要的研究目标是研究在高度湍流的液体燃料火焰与氢富集的基于湍流的过程，并开发新的激光诊断工具，使这些研究。教育活动的重点是在本科和研究生课程中增加燃烧物理学内容，并创建可视化演示活动。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建造的实验演示。这些演示设备可运输到教室环境和外展活动。学习模块将开发在线共享，电视交付与PBS WKAR，并在YouTube上的全球访问。主要的研究目标是调查在全球和本地尺度的高雷诺数，湍流液体双燃料，富氢火焰吹除过程中的预防为基础的过程。特别强调将放在研究富氢对火焰结构中局部燃烧的影响，给出不同的Le混合物和潜在的不均匀混合。这项研究将集中在动力学的主要prevaporized火焰除了稀释液滴喷雾火焰，其中每个都有独特的主导热物理性质和熄灭机制，由于液滴，燃料蒸汽，湍流和火焰之间的相互作用。实验计划的目的是：（1）解决全球井喷瞬变和局部熄灭过程之间的耦合问题，（2）推进液体燃料火焰中CH/甲醛PLIF和Rayleigh散射测温的新诊断方法，以及（3）捕获火焰结构，温度，标量耗散，和曲率，可以通过验证质量的数据集纳入高级模拟和建模。新开发的诊断策略将被用来观察由于曲率和Le效应而受到燃烧化学相互作用影响的火焰结构中的燃烧。在这些流量的2-D标量场的测量将提供联合PDF统计的温度，进度变量，标量耗散尚未实验报告的重烃燃料。这些新工具的可用性将允许深入了解以前无法进入的液体燃料燃烧制度。该奖项反映了NSF的法定使命，并被认为值得通过使用基金会的知识价值和更广泛的影响审查标准进行评估来支持。

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.