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Flickering characteristics and temperature field of premixed methane/air flame under the influence of co-flow

机译：共流影响下甲烷/空气预混火焰的闪烁特性和温度场

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摘要

The flickering characteristics and the temperature field of an axisymmetric premixed methane/air flame under the influence of co-flow are studied experimentally using the image analysis and the flame reaction technique. The premixed flame is visualized by the alkali metal solution of sodium (Na) for characterizing the flickering characteristics. The temperature measurement of the flame is carried out using the flame reaction technique combined with the relationship between the local intensity of the flame and the temperature from the sodium D-line reversal method, and the influence of the number density distribution of Na on the measured temperature field is corrected by the measurement integrated analysis of the flame with the iterative procedure. This technique is validated by the local temperature measurement in the steady flame under the influence of co-flow using the thermocouple calibrated by the sodium D-line reversal method. The flame visualization and temperature measurement in the flickering flame of the premixed methane/air flame indicates that the flame contour and the temperature field oscillate periodically with the flickering frequency due to the Kelvin-Helmholtz instability of the flame. The oscillation amplitude decreases and the frequency increases gradually with the co-flow velocity increases similar to the observation in the diffusion flame in literature, while the oscillation amplitude grows with the equivalence ratio increases. These changes in the flickering characteristics of the flame are caused by the variations of the temperature field in the premixed flame.
机译：利用图像分析和火焰反应技术，对轴对称预混甲烷/空气火焰在共流影响下的闪烁特性和温度场进行了实验研究。预混合火焰通过钠（Na）的碱金属溶液可视化，以表征闪烁特性。火焰的温度测量是通过使用火焰反应技术，结合火焰的局部强度与钠D线反转法的温度之间的关系以及Na的数量密度分布对所测量的影响而进行的通过迭代测量火焰的测量综合分析来校正温度场。通过使用钠D线反转法校准的热电偶，在并流影响下在稳定火焰中的局部温度测量验证了该技术的有效性。预混甲烷/空气火焰的闪烁火焰中的火焰可视化和温度测量表明，由于火焰的Kelvin-Helmholtz不稳定性，火焰轮廓和温度场以闪烁频率周期性地振荡。类似于文献中扩散火焰中的观察，随着共流速度的增加，振动幅度减小，频率逐渐增加，而当当量比增加时，振动幅度增大。火焰闪烁特性的这些变化是由预混火焰中温度场的变化引起的。

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