Three-dimensional flame displacement speed and flame front curvature measurements using quad-plane PIV
Three-dimensional flame displacement speed and flame front curvature measurements using quad-plane PIV
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DOI：
10.1016/j.combustflame.2013.07.002
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发表时间：
2013-12
影响因子：
4.4
通讯作者：
J. Kerl;C. Lawn;F. Beyrau
中科院分区：
文献类型：
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作者：
J. Kerl;C. Lawn;F. Beyrau
在这项工作中，我们使用四平面粒子图像测速技术来研究燃烧研究中几个重要参数的三维行为，如火焰位移速度和火焰前沿曲率。在扩散器燃烧器内稳定预混甲烷火焰的结果中，对三维和二维数据进行了比较，以便批判性地分析通常进行的平面测量的误差。结果表明，二维测量只能在某些情况下给出真实情况的估计，例如火焰中主要是球形结构，火焰传播和流动方向都与测量平面完美对准。然而，在湍流火焰中，由于湍流引起的波动，这种对准永远不可能实现。两个交叉面的应用带来了显著的改善，虽然没有达到完美的匹配，但可以观察到与三维量很好地吻合。火焰位移速度范围为−0.4s L~4.5s L，平均值为1.1s L，但与火焰曲率或应变速率无关。
In this work we demonstrate the use of a quad-plane particle image velocimetry technique in order to investigate the three-dimensional behavior of several important quantities for combustion research such as the flame displacement speed and the flame front curvature. In results from a premixed methane flame stabilized in a diffuser burner, a comparison of three-dimensional and two-dimensional data is made in order to critically analyze the error of the usually performed planar measurements. It is shown that two-dimensional measurements can only give an estimate of the real situation under certain circumstances, such as with mainly spherical structures in the flame and the perfect alignment of both the flame propagation and flow direction to the measurement plane. However, in turbulent flames, this alignment can never be achieved due to fluctuations stemming from turbulence. The application of two crossed planes leads to significant improvements and good agreement with the three-dimensional quantities can be observed, although no perfect match is achieved. Flame displacement speeds ranging from −0.4sLto 4.5sLwith a mean of 1.1sLwere recorded, but were not correlated with the flame curvature or strain rate.