EAGER: A Shock Tube Study of Laminar Flames in Transportation Fuels at Engine Relevant Temperatures

EAGER：在发动机相关温度下运输燃料中层流火焰的激波管研究

• 批准号: 1940865
• 负责人: Ronald Hanson
• 金额: $ 20万
• 依托单位: Stanford University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-12-01 至 2022-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1940865&HistoricalAwards=false
• 关键词: EAGER; Shock; Tube; Study; Laminar

This project aims to develop novel experimental techniques for studying flames at conditions relevant to transportation systems. Currently, experimental limitations prevent the study of premixed flames at the high-temperatures found in modern spark-ignition and jet engines. By using shock tubes, this work aims to overcome those practical limits and allow future experimental studies to be conducted at the conditions most relevant to modern engines. Exploratory work will also be undertaken to understand unique structures only present in high-temperature flames. Together, this work will support the development of the clean and efficient engines needed to meet the critical goals of reducing air pollution, reigning in transportation-related greenhouse gas emissions, and limiting dependence on foreign fossil fuels. The first of two major goals of this project is to refine the shock-tube flame speed method recently demonstrated in the Hanson laboratory. The rapid heating and quiescent post-shock conditions in a shock tube allow for spherically expanding flames to be initiated and studied at previously inaccessible temperatures. This method will be further refined and validated to optimize experimental and data-processing methods in order to ensure that high-temperature flame data produced using the method meets the high quality standards of the scientific and engineering communities. The second major goal is to use a variety of laser- and imaging-based diagnostics to study peculiar flame structures observed at high temperatures. Both simulations and preliminary experimental evidence suggest that two-stage flames, with a cool flame preceding the classical hot flame, may be observed at high temperatures. This phenomenon will be experimentally investigated, an objective that will leverage both the unique ability to generate flames at high temperatures afforded by the shock tube and the existing optical diagnostic expertise of the Hanson lab. Diagnostics to be employed in the study of high-temperature flame structure are likely to include line-of-sight laser absorption, planar laser-induced fluorescence, and spectrally filtered emission imaging.This 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.

该项目旨在开发新的实验技术，用于研究运输系统相关条件下的火焰。目前，实验限制阻碍了对现代火花点火和喷气发动机中高温预混火焰的研究。通过使用激波管，这项工作旨在克服这些实际限制，并允许未来的实验研究在与现代发动机最相关的条件下进行。勘探工作也将进行，以了解只存在于高温火焰中的独特结构。总之，这项工作将支持清洁和高效发动机的开发，以实现减少空气污染、控制与运输有关的温室气体排放和限制对外国化石燃料的依赖等关键目标。该项目的两个主要目标中的第一个是改进汉森实验室最近演示的激波管火焰速度方法。激波管内的快速加热和静后激波条件允许在以前无法达到的温度下启动和研究球形膨胀火焰。该方法将进一步完善和验证，以优化实验和数据处理方法，以确保使用该方法产生的高温火焰数据符合科学和工程界的高质量标准。第二个主要目标是使用各种基于激光和成像的诊断来研究在高温下观察到的特殊火焰结构。模拟和初步实验证据都表明，在高温下可以观察到两级火焰，冷火焰先于经典热火焰。这一现象将通过实验进行研究，目的是利用激波管在高温下产生火焰的独特能力和汉森实验室现有的光学诊断专业知识。用于高温火焰结构研究的诊断可能包括视距激光吸收、平面激光诱导荧光和光谱滤波发射成像。该奖项反映了美国国家科学基金会的法定使命，并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，被认为值得支持。

项目成果

Ultraviolet Laser Absorption Imaging of High-Speed Flows in a Shock Tube

• DOI: 10.2514/6.2022-0558
• 发表时间: 2022-01
• 期刊: AIAA SCITECH 2022 Forum
• 作者: Lingzhi Zheng;A. J. Susa;Ajay Krish;R. Hanson

Laminar Flame Speed Measurements of Primary Reference Fuels at Extreme Temperatures

极端温度下主要参考燃料的层流火焰速度测量

• DOI: 10.1115/icef2022-90501
• 发表时间: 2022
• 期刊: ASME 2022 ICE Forward Conference (ICEF2022
• 作者: Susa, Adam J.;Zheng, Lingzhi;Nygaard, Zach D.;Ferris, Alison M.;Hanson, Ronald K.
• 通讯作者: Hanson, Ronald K.

Logistic-Regression-Based Meta-Analysis of Factors Affecting Flame Stability in a Shock Tube

• DOI: 10.1080/00102202.2022.2142046
• 发表时间: 2022-11
• 期刊: Combustion Science and Technology
• 影响因子: 1.9
• 作者: A. J. Susa;A. Ferris;Lingzhi Zheng;Ronald K. Hanson

Flame-drift velocimetry and flame morphology measurements with dual-perspective imaging in a shock tube

在激波管中使用双视角成像进行火焰漂移测速和火焰形态测量

• 发表时间: 2021
• 期刊: 12th U.S. National Combustion Meeting
• 作者: Susa, Adam J;Hanson, Ronald K
• 通讯作者: Hanson, Ronald K

Methodology of designing compact schlieren systems using off-axis parabolic mirrors

使用离轴抛物面镜设计紧凑纹影系统的方法

• DOI: 10.1364/ao.457151
• 发表时间: 2022
• 期刊: Applied Optics
• 影响因子: 1.9
• 作者: Zheng, Lingzhi;Susa, Adam J.;Hanson, Ronald K.
• 通讯作者: Hanson, Ronald K.