HTPB逆流扩散火焰中温度和CO分布的激光吸收光谱测量

IF 5.8 2区工程技术 Q2 ENERGY & FUELS

Combustion and Flame Pub Date : 2025-07-15 DOI:10.1016/j.combustflame.2025.114325

Austin McDonald , Jonathan J. Gilvey , Michael J. McQuaid , Chiung-Chiu Chen , Jeffrey D. Veals , Christopher P. Stone , Steven F. Son , Christopher S. Goldenstein

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引用次数: 0

摘要

本文介绍了端羟基聚丁二烯（HTPB）反向流动扩散火焰中温度和CO摩尔分数的扫描波长直接吸收测量。HTPB链被放置在一个反向流动的燃烧器中，在O2或50/50 O2/N2的反向流动下，在燃料链上方产生准稳定和准一维扩散火焰。对流燃烧器垂直转换，有效地扫描测量视线垂直通过火焰。利用量子级联激光器（QCL）在10khz下扫描CO在2008 cm−1附近基振带的P（2,20）、P（0,31）和P（3,14）吸收跃迁，以确定CO的温度和摩尔分数。激光束通过靠近火焰边缘的蓝宝石棒，绕过火焰边界，为摩尔分数测量提供了一个明确的路径长度。测量的剖面和燃料回归率与稳定的反流一维扩散火焰模型的预测结果进行了比较。该模型采用了HTPB热解新生气态产物C4H6或C20H32两种不同假设的化学动力学机制。结果发现，后一种模型得到的温度和CO分布曲线以及回归速率与实测温度、CO摩尔分数和燃料回归速率更接近。新颖性和意义声明：描述了一种新的实验装置，该装置能够对固体燃料反流扩散火焰中的温度和物质的一维轮廓进行高保真激光吸收测量。此外，本研究首次实现了对端羟基聚丁二烯（HTPB）反向流动扩散火焰中温度和CO摩尔分数的高分辨率（亚毫米）空间分辨测量。将测量结果与理论预测结果进行了比较，这证明了HTPB热解和燃烧的一种新的化学动力学机制能够更准确地预测温度和CO分布以及燃料回归速率。

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查看原文本刊更多论文

Laser absorption spectroscopy measurements of temperature and CO profiles in opposed-flow diffusion flames of HTPB

This work presents scanned-wavelength direct-absorption measurements of temperature and CO mole fraction in opposed-flow diffusion flames of hydroxyl-terminated polybutadiene (HTPB). HTPB strands were held in an opposed-flow burner under an opposed flow of O

_{2}

or 50/50 O

_{2}

_{2}

to create quasi-steady and quasi-1D diffusion flames above the fuel strand. The opposed-flow burner was translated vertically to effectively scan the measurement line-of-sight vertically through the flame. A quantum-cascade laser (QCL) was scanned across the P(2,20), P(0,31), and P(3,14) absorption transitions in CO’s fundamental vibration bands near 2008 cm⁻¹ at 10 kHz to determine the temperature and CO mole fraction. The laser beam was passed through sapphire rods held close to the flame edge to bypass the flame boundary and provide a well defined path length for mole fraction measurements. The measured profiles and fuel regression rates were compared to predictions produced by a steady opposed-flow 1D diffusion flame model. The model utilized chemical kinetics mechanisms employing two different assumptions for the nascent gaseous product of HTPB pyrolysis:

C_{4} H_{6}

C_{20} H_{32}

. It was found that the latter model produced temperature and CO profiles along with regression rates that agreed more closely with the measured temperatures, CO mole fraction, and fuel regression rates.

Novelty and Significance Statement

A novel experimental setup that enables high-fidelity laser-absorption measurements of 1D profiles of temperature and species in opposed-flow diffusion flames of solid fuels is described. Further, this work presents the first high resolution (sub-millimeter) spatially resolved measurements of temperature and CO mole fraction in opposed-flow diffusion flames of hydroxyl-terminated polybutadiene (HTPB). The measurements are compared to theoretical predictions and this proved that a new chemical kinetic mechanism for HTPB pyrolysis and combustion enables significantly more accurate predictions of temperature and CO profiles as well as fuel regression rates.

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来源期刊

Combustion and Flame 工程技术-工程：化工

CiteScore

9.50

自引率

20.50%

发文量

631

审稿时长

3.8 months

期刊介绍： The mission of the journal is to publish high quality work from experimental, theoretical, and computational investigations on the fundamentals of combustion phenomena and closely allied matters. While submissions in all pertinent areas are welcomed, past and recent focus of the journal has been on: Development and validation of reaction kinetics, reduction of reaction mechanisms and modeling of combustion systems, including: Conventional, alternative and surrogate fuels; Pollutants; Particulate and aerosol formation and abatement; Heterogeneous processes. Experimental, theoretical, and computational studies of laminar and turbulent combustion phenomena, including: Premixed and non-premixed flames; Ignition and extinction phenomena; Flame propagation; Flame structure; Instabilities and swirl; Flame spread; Multi-phase reactants. Advances in diagnostic and computational methods in combustion, including: Measurement and simulation of scalar and vector properties; Novel techniques; State-of-the art applications. Fundamental investigations of combustion technologies and systems, including: Internal combustion engines; Gas turbines; Small- and large-scale stationary combustion and power generation; Catalytic combustion; Combustion synthesis; Combustion under extreme conditions; New concepts.