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首页> 外文期刊>Combustion and Flame >X-ray computed tomography for flame-structure analysis of laminar premixed flames
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X-ray computed tomography for flame-structure analysis of laminar premixed flames

机译：X射线计算机断层摄影术用于层流预混火焰的火焰结构分析

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Quantitative X-ray computed tomography (XCT) diagnostics for reacting flows are developed and demonstrated in application to premixed flames in open and optically inaccessible geometries. A laboratory X-ray scanner is employed to investigate methane/air flames that were diluted with krypton as an inert radiodense tracer gas. Effects of acquisition rate and tracer gas concentration on the signal-to-noise ratio are examined. It is shown that statistically converged three-dimensional attenuation measurements can be obtained with limited impact from the tracer gas and within an acceptable acquisition time. Specific aspects of the tomographic reconstruction and the experimental procedure are examined, with particular emphasis on the quantification of experimental uncertainties. A method is developed to determine density and temperature from the X-ray attenuation measurements. These experiments are complemented by one- and multi-dimensional calculations to quantify the influence of krypton on the flame behavior. To demonstrate the merit of XCT for optically inaccessible flames, measurements of a complex flame geometry in a tubular confinement are performed. The use of a coflow to provide a uniform tracer-gas concentration is shown to improve the quantitative temperature evaluation. These measurements demonstrate the viability of XCT for flame-structure analysis and multi-dimensional temperature measurements using laboratory X-ray systems. Further opportunities for improving this diagnostic are discussed. (C) 2018 The Combustion. Institute. Published by Elsevier Inc. All rights reserved.
机译：开发了用于反应流的定量X射线计算机断层摄影（XCT）诊断程序，并已在开放和光学上难以接近的几何形状中的预混火焰应用中得到了证明。使用实验室X射线扫描仪来研究甲烷/空气火焰，这些甲烷/空气火焰被rypto稀释为惰性放射性密集示踪气体。检查了采集速率和示踪气体浓度对信噪比的影响。结果表明，在示踪气体的有限影响下，可以在可接受的采集时间内获得统计收敛的三维衰减测量值。检查了层析成像重建和实验程序的特定方面，尤其着重于实验不确定性的量化。开发了一种从X射线衰减测量确定密度和温度的方法。这些实验辅以一维和多维计算，以量化k对火焰行为的影响。为了证明XCT对于光学上难以接近的火焰的优点，对管状限制区内复杂的火焰几何形状进行了测量。已显示使用同流提供均匀的示踪气体浓度可改善定量温度评估。这些测量证明了XCT在使用实验室X射线系统进行火焰结构分析和多维温度测量中的可行性。讨论了改善此诊断的其他机会。 （C）2018年燃烧。研究所。由Elsevier Inc.出版。保留所有权利。

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