Characterization of Reactor-Assisted Burner Flames using Ultrafast Infrared Spectroscopy

使用超快红外光谱表征反应器辅助燃烧器火焰

• 批准号: 1834972
• 负责人: Christopher Goldenstein
• 金额: $ 24.79万
• 依托单位: Purdue University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-08-01 至 2022-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1834972&HistoricalAwards=false
• 关键词: Characterization; Reactor; Assisted; Burner; Flames

Many practical transportation fuels often undergo a two-stage ignition process under the so-called low-temperature combustion conditions. This feature can accelerate flame propagation which could be exploited to develop smaller, more efficient, and cleaner burning engines for automobiles and aircrafts. However, the low-temperature combustion physics governing flame propagation in these systems is poorly understood. Thus, a primary goal of this project is to improve our understanding of low-temperature combustion. New laser diagnostics will be developed to quantify the specific molecules that are formed during low-temperature combustion of transportation fuels and to determine how these molecules accelerate flame propagation at conditions relevant to modern engines. This project will provide new laser diagnostics, capable of characterizing combustion chemistry, and fundamental data, describing how the extent of low-temperature combustion alters the propagation of flames. The resulting knowledge can help engineers design clean and efficient combustion systems for propulsion and power generation.It is not well understood how the extent of low-temperature combustion alters the turbulent burning velocity and structure of turbulent flames fueled by heavy hydrocarbons (e.g., Jet-A, diesel). This issue is complicated by the large number of hydrocarbon species found in practical fuels and the fact that low-temperature ignition reforms the initial reactant stream into a complex mixture with a time-varying composition. Further, understanding the physicochemical processes governing the behavior of these flames is impeded by the lack of non-intrusive diagnostics. This research program will fill these gaps through: 1) the development of novel ultrafast mid- to far-infrared laser diagnostics with sub-picosecond resolution and 2) their application to characterizing reactor-assisted burner flames fueled by n-dodecane and Jet-A. The use of ultrafast pulses will enable large portions of the mid- to far-infrared spectrum to be interrogated on sub-picosecond timescales, while also enabling collision-free measurements of molecular spectra to be acquired. These attributes will be exploited to provide simplified multi-parameter characterization of the reactant stream and turbulent flames produced by a novel reactor-assisted burner. This approach will provide new fundamental data and insight regarding how the temperature and composition of the reactant stream alters turbulent flame propagation at conditions relevant to modern propulsion engines.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.

许多实际的运输燃料通常在所谓的低温燃烧条件下经历两阶段点火过程。这种特性可以加速火焰的传播，这可以用来开发更小、更高效、更清洁的汽车和飞机发动机。然而，在这些系统中，控制火焰传播的低温燃烧物理是知之甚少的。因此，这个项目的主要目标是提高我们对低温燃烧的理解。新的激光诊断将被开发出来，以量化运输燃料在低温燃烧过程中形成的特定分子，并确定这些分子如何在与现代发动机相关的条件下加速火焰传播。该项目将提供新的激光诊断，能够表征燃烧化学，以及基本数据，描述低温燃烧的程度如何改变火焰的传播。由此产生的知识可以帮助工程师为推进和发电设计清洁高效的燃烧系统。低温燃烧的程度如何改变重碳氢化合物（如Jet-A、柴油）燃烧的湍流火焰的湍流燃烧速度和结构，目前还不是很清楚。由于在实际燃料中发现了大量的碳氢化合物，并且低温点火会将初始反应物流转化为具有时变成分的复杂混合物，这使问题变得复杂。此外，由于缺乏非侵入性诊断，对控制这些火焰行为的物理化学过程的理解受到了阻碍。该研究项目将通过以下途径填补这些空白：1)开发具有亚皮秒分辨率的新型超快中远红外激光诊断；2)将其应用于表征以正十二烷和Jet-A为燃料的反应器辅助燃烧器火焰。超快脉冲的使用将使大部分中远红外光谱能够在亚皮秒的时间尺度上进行查询，同时也使分子光谱的无碰撞测量成为可能。这些属性将被用来提供一种新型反应堆辅助燃烧器产生的反应物流和湍流火焰的简化多参数表征。这种方法将提供新的基础数据和见解，了解反应物流的温度和组成如何在与现代推进发动机相关的条件下改变湍流火焰传播。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

Ultrafast-laser-absorption spectroscopy in the mid-infrared for single-shot, calibration-free temperature and species measurements in low- and high-pressure combustion gases

中红外超快激光吸收光谱，用于低压和高压燃烧气体中的单次、免校准温度和组分测量

• DOI: 10.1364/oe.435506
• 发表时间: 2021
• 期刊: Optics Express
• 影响因子: 3.8
• 作者: Tancin, Ryan J.;Goldenstein, Christopher S.
• 通讯作者: Goldenstein, Christopher S.

Ultrafast Laser Absorption Spectroscopy in the Mid-Infrared for Measuring Temperature and Species in Combustion Gases

中红外超快激光吸收光谱用于测量燃烧气体中的温度和物质

• DOI: 10.2514/6.2020-0517
• 发表时间: 2020
• 期刊: AIAA Scitech 2020 Forum
• 作者: Tancin, Ryan J.;Chang, Ziqiao;Radhakrishna, Vishnu;Gu, Mingming;Lucht, Robert P.;Goldenstein, Christopher S.
• 通讯作者: Goldenstein, Christopher S.

Ultrafast-laser-absorption-spectroscopy measurements of gas temperature in multi-phase, high-pressure combustion gases

多相高压燃烧气体中气体温度的超快激光吸收光谱测量

• DOI: 10.2514/6.2021-0719
• 发表时间: 2021
• 期刊: AIAA SciTech 2021 Forum
• 作者: Tancin, Ryan J.;Ruesch, Morgan;Son, Steven F.;Lucht, Robert P.;Goldenstein, Christopher S.
• 通讯作者: Goldenstein, Christopher S.

Ultrafast laser-absorption spectroscopy for single-shot, mid-infrared measurements of temperature, CO, and CH 4 in flames

用于火焰中温度、CO 和 CH 4 的单次中红外测量的超快激光吸收光谱

• DOI: 10.1364/ol.45.000583
• 发表时间: 2020
• 期刊: Optics Letters
• 影响因子: 3.6
• 作者: Tancin, Ryan J.;Chang, Ziqiao;Gu, Mingming;Radhakrishna, Vishnu;Lucht, Robert P.;Goldenstein, Christopher S.
• 通讯作者: Goldenstein, Christopher S.