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首页> 外文期刊>Combustion and Flame >A study of JP-8 surrogate coflow flame structure by combined use of laser diagnostics and numerical simulation
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A study of JP-8 surrogate coflow flame structure by combined use of laser diagnostics and numerical simulation

机译：激光诊断与数值模拟相结合的JP-8替代同流火焰结构研究

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摘要

The structure of a JP-8 coflow flame is investigated by applying laser diagnostic techniques to three different fuel surrogates. The results are compared against theoretical predictions from numerical simulations; very good agreement is obtained for temperature and major species. Rayleigh and Raman scattering are used to measure temperature and major species mole fractions in the flame (oxygen, carbon dioxide, water, and fuel molecules). Quantitative laser diagnostic techniques are particularly challenging when applied to jet-fuel flames; the presence of aromatic molecules in the fuel mixtures and the formation of polyaromatic compounds inside the flame generate spectrally broad fluorescence signals that interfere with the measurement. A polarized/depolarized subtraction technique combined with a post-processing filter based on least-squares fitting is used to mitigate this undesired effect. The proposed technique tries to match the experimental signal against previously calculated spectra and has proved to be a very efficient filter at rejecting polyaromatic fluorescence. Numerical simulations play a fundamental role in this study. Computer predictions are used not only to compare experimental data, but as an active component of the data post-processing. For example, numerically calculated cross-section maps are used to refine the measured temperature for both the Rayleigh and Raman experiments.
机译：通过将激光诊断技术应用于三种不同的燃料替代物，研究了JP-8共流火焰的结构。将结果与数值模拟的理论预测进行比较；对于温度和主要种类获得了很好的一致性。瑞利散射和拉曼散射用于测量温度和火焰中主要物质的摩尔分数（氧气，二氧化碳，水和燃料分子）。当应用于喷气燃料火焰时，定量激光诊断技术尤其具有挑战性。燃料混合物中芳族分子的存在以及火焰内多芳族化合物的形成会产生光谱宽泛的荧光信号，从而干扰测量。极化/去极化减法技术与基于最小二乘拟合的后处理滤波器结合使用可减轻这种不良影响。所提出的技术试图使实验信号与先前计算的光谱相匹配，并已被证明是拒绝多芳族荧光的非常有效的滤波器。数值模拟在这项研究中起着基本作用。计算机预测不仅用于比较实验数据，而且还用作数据后处理的有效组成部分。例如，使用数值计算的横截面图来完善瑞利和拉曼实验的测量温度。

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  • 来源
    《Combustion and Flame》 |2012年第10期|p.3027-3039|共13页
  • 作者

    Luca Tosatto; Federico Mella; Marshall B. Long; Mitchell D. Smooke;

  • 作者单位

    Department of Mechanical Engineering, Yale University, 15 Prospect Street, New Haven, CT 06511, USA;

    Department of Aerospace Engineering, Politecnico di Milano, Via La Masa 34, 20156 Milano, Italy;

    Department of Mechanical Engineering, Yale University, 15 Prospect Street, New Haven, CT 06511, USA;

    Department of Mechanical Engineering, Yale University, 15 Prospect Street, New Haven, CT 06511, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    laser diagnostics; jet fuel; raman; laminar flames; rayleigh scattering;

    机译：激光诊断;喷气燃料;拉曼层流火焰瑞利散射;

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