Temperature Response of an Acoustically Forced Turbulent Lean Premixed Flame: A Quantitative Experimental Determination
Temperature Response of an Acoustically Forced Turbulent Lean Premixed Flame: A Quantitative Experimental Determination
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DOI：
10.1080/00102202.2012.714020
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发表时间：
2013-01
影响因子：
1.9
通讯作者：
Robin S. M. Chrystie;I. Burns;C. Kaminski
中科院分区：
文献类型：
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作者：
Robin S. M. Chrystie;I. Burns;C. Kaminski
本文对声强迫贫油预混湍流钝体稳定火焰进行了温度测量。本研究中使用的燃烧器是剑桥大学研究燃气涡轮发动机热声不稳定性的试验台。在该燃烧器上进行了大量的实验，其中一个实验采用了双线OH平面激光诱导荧光测温。在这里，我们采用振动相干反斯托克斯拉曼散射（汽车）的氮作为一种替代来测量温度，规避了前一种方法的局限性。使用氮气汽车避免了探测具有低OH浓度的火焰区域的问题，该问题导致错误的温度。汽车的这种应用表明，从以前的努力的结果是系统性的偏差高达47%，接近钝体。我们还批判性地回顾了在我们的实验中使用的汽车的局限性，有关的空间分辨率和相关的偏置进一步下游的钝体。使用更准确的结果，从这项工作中，更先进的最新的计算流体动力学（CFD）模型的燃烧器可以验证，提高理解和预测的燃气轮机热声不稳定性的目的。
Temperature measurements have been taken on an acoustically forced lean premixed turbulent bluff-body stabilized flame. The burner used in this study is a test-bed to investigate thermoacoustic instability in gas-turbine engines at the University of Cambridge. Numerous experiments have been performed on the burner, one of which used two-line OH planar laser induced fluorescence to measure temperature. Here, we employ vibrational coherent anti-Stokes Raman scattering (CARS) of nitrogen as an alternative to measure temperature, circumventing the limitations of the former method. The use of nitrogen CARS avoids the problem of probing regions of the flame with low OH concentrations that resulted in erroneous temperature. Such an application of CARS showed that the results from previous efforts were systematically biased up to 47% close to the bluff-body. We also critically review the limitations of CARS used in our experiments, pertaining to spatial resolution and associated biasing further downstream from the bluff-body. Using the more accurate results from this work, more up-to-date computational fluid dynamical (CFD) models of the burner can be validated, with the aim of improved understanding and prediction of thermoacoustic instability in gas turbines.