Frequency-resolved interferometric measurement of local density fluctuations for turbulent combustion analysis
Frequency-resolved interferometric measurement of local density fluctuations for turbulent combustion analysis
复制标题
用于湍流燃烧分析的局部密度波动的频率分辨干涉测量
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
Jakob Woisetschläger
中科院分区：
文献类型：
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作者：
Stefan Köberl;Fabrizio Fontaneto;Fabrice Giuliani;Jakob Woisetschläger
这项工作对一种新颖的干涉测量技术进行了验证，该技术可用于湍流燃烧分析中局部密度波动的频率分辨检测。使用两个激光振动计系统和信号分析仪来获得甲烷喷射火焰中密度波动的频谱。由于激光测振法基于干涉测量技术，因此导出的信号是沿测量光束的路径积分。为了获得密度波动的局部频谱，使用相关函数和互谱对两个系统中的每一个进行了长时间平均测量。将结果与标准干涉技术记录的数据进行比较以进行验证。此外，拉曼散射和激光多普勒测速用于火焰表征。
A validation of a novel interferometric measurement technique for the frequency-resolved detection of local density fluctuation in turbulent combustion analysis was performed in this work. Two laser vibrometer systems together with a signal analyser were used to obtain frequency spectra of density fluctuations across a methane-jet flame. Since laser vibrometry is based on interferometric techniques, the derived signals are path-integrals along the measurement beam. To obtain local frequency spectra of density fluctuations, long-time-averaged measurements from each of the two systems were performed using correlation functions and cross spectra. Results were compared to data recorded by standard interferometric techniques for validation purposes. Additionally, Raman scattering and laser Doppler velocimetry were used for flame characterization.