激光干涉振动法测定无约束旋流稳定火焰放热波动的探讨

2019/07/26   下载量： 0 次

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应用领域 能源/新能源
检测样本 其他
检测项目
参考标准 暂无

采用LaVision的图像采集和处理软件平台DaVis以及高速相机记录了无约束旋流稳定火焰的HO*自发辐射荧光，并和激光干涉测振方法相结合，研究了燃烧过程的放热波动现象。

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Fluctuations in heat release, hot and cold spots convected by the flow and sound waves are all related to density fluctuations, a number easily detected by interferometry. Same as chemiluminescence, inter- ferometry is a line-of-sight method and therefore needs optical access and tomographic reconstruction of density fields. In this work we discuss the use of Laser Interferometric Vibrometry (LIV) as an alternative or extension to chemiluminescence when detecting heat release fluctuations in the flame, convection of hot and cold spots in the non-reacting flow field and sound waves emitted from a 3.4 kW turbulent, unconfined swirl-stabilized methane/air flame under perfectly premixed conditions. For this discussion local temperatures, local ratios of heat release and local Gladstone-Dale constants are determined and their influence on the result discussed. Global and local fluctuations in heat release rate recorded by LIV and chemiluminescence are compared, resulting in the same global values if local temperature fields and local equivalence ratios are used for LIV data evaluation. In contrast, local fluctuations in OH ∗chemilu- minescence emission are influenced by turbulence and strain in this type of flame.

上一篇 在一个双稳湍流涡旋火焰中，对间歇性动态的时间-频率定位
下一篇 自燃过程在湍流火焰稳定中作用的实验研究

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北京欧兰科技发展有限公司
金牌会员 丨 第17年
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