Measurement and analysis of flame surface density for turbulent premixed combustion on a nozzle-type burner
Measurement and analysis of flame surface density for turbulent premixed combustion on a nozzle-type burner
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DOI：
10.1016/s0010-2180(00)00102-4
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发表时间：
2000-07
影响因子：
4.4
通讯作者：
G. Lee;K. Huh;Hideaki Kobayashi
中科院分区：
文献类型：
--
作者：
G. Lee;K. Huh;Hideaki Kobayashi
采用平面激光诱导荧光（PLIF）技术和图像处理技术，对湍流预混燃烧火焰面密度进行了测量。最大火焰面密度与K因子呈线性关系，K因子是积分长度尺度和u′0/SL的函数。火焰表面密度在无量纲参数NB（代表湍流梯度或反梯度扩散的程度）中与峰值位置相关的cnc空间中显示出不对称的轮廓。在NB接近1的值处，峰值出现在约0.7的C值处。当NB增加到高于1时，峰在c空间中移动到较低值，接近对称轮廓。由积分长度尺度无量纲化的湍流火焰刷的厚度倾向于显示出对H因子的线性依赖性，该H因子通过积分反应进程变量的一阶矩方程而获得。在较高的环境压力下，由于层流燃烧速度和火焰传播长度尺度的减小，火焰面密度增大。
The flame surface density for turbulent premixed combustion on a nozzle-type burner is measured by planar laser-induced fluorescence (PLIF) and image processing techniques. The maximum flame surface density tends to show linear dependence on the K-factor given as a function of the integral length scale and u′0/SL. The flame surface density shows an asymmetric profile in c̄ space with the peak location correlated in terms of the dimensionless parameter, NB, which represents the degree of gradient or countergradient diffusion by turbulence. At values of NBclose to unity the peak occurs at a value of c̄ of about 0.7. As NBincreases above unity, the peak moves to a lower value in c̄ space, approaching a symmetric profile. The thickness of a turbulent flame brush nondimensionalized by the integral length scale tends to show linear dependence on the H-factor which is obtained by integrating the first moment equation of the reaction progress variable. The flame surface density increases at a higher ambient pressure due to decrease in the laminar burning velocity and the length scales of flame wrinkling.