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Turbulent premixed combustion in V-shaped flames: Characteristics of flame front

机译：V形火焰中的湍流预混燃烧：火焰前锋的特征

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Flame front characteristics of turbulent premixed V-shaped flames were investigated experimentally using the Mie scattering and the particle image velocimetry techniques. The experiments were performed at mean streamwise exit velocities of 4.0, 6.2, and 8.6 m/s, along with fuel-air equivalence ratios of 0.7, 0.8, and 0.9. Effects of vertical distance from the flame-holder, mean streamwise exit velocity, and fuel-air equivalence ratio on statistics of the distance between the flame front and the vertical axis, flame brush thickness, flame front curvature, and angle between tangent to the flame front and the horizontal axis were studied. The results show that increasing the vertical distance from the flame-holder and the fuel-air equivalence ratio increase the mean and root-mean-square (RMS) of the distance between the flame front and the vertical axis; however, increasing the mean streamwise exit velocity decreases these statistics. Spectral analysis of the fluctuations of the flame front position depicts that the normalized and averaged power-spectrum-densities collapse and show a power-law relation with the normalized wave number. The flame brush thickness is linearly correlated with RMS of the distance between the flame front and the vertical axis. Analysis of the curvature of the flame front data shows that the mean curvature is independent of the experimental conditions tested and equals to zero. Values of the inverse of the RMS of flame front curvature are similar to those of the integral length scale, suggesting that the large eddies in the flow make a significant contribution in wrinkling of the flame front. Spectral analyses of the flame front curvature as well as the angle between tangent to the flame front and the horizontal axis show that the power-spectrum-densities feature a peak. Value of the inverse of the wave number pertaining to the peak is larger than that of the integral length scale.
机译：使用Mie散射和粒子图像测速技术，通过实验研究了湍流预混V形火焰的火焰前沿特性。实验以平均流向出口速度为4.0、6.2和8.6 m / s进行，燃料-空气当量比为0.7、0.8和0.9。距火焰保持器的垂直距离，平均射流出口速度和燃油-空气当量比对火焰前沿与垂直轴之间的距离，火焰刷厚度，火焰前沿曲率以及与火焰切线之间的角度统计的影响研究了前轴和水平轴。结果表明，增加距火焰保持器的垂直距离和燃料-空气当量比，会增加火焰前沿与垂直轴之间的距离的均值和均方根（RMS）;但是，增加平均水流出口速度会降低这些统计数据。火焰前沿位置波动的频谱分析表明，归一化和平均的功率谱密度会崩溃，并显示与归一化波数的幂律关系。火焰刷的厚度与火焰前沿和垂直轴之间的距离的RMS线性相关。火焰前锋数据的曲率分析表明，平均曲率与测试的实验条件无关，等于零。火焰前曲率RMS的倒数与整数长度刻度的值相似，这表明流动中的大涡流对火焰前曲起皱起了重要作用。火焰前沿曲率以及与火焰前沿的切线与水平轴之间的夹角的光谱分析表明，功率谱密度具有峰值。与峰有关的波数的倒数的值大于整数长度标度的值。

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