INVESTIGATION OF FLAMELETS IN ATURBULENT PREMIXED FLAME WITH A 4 -ELEMENT ELECTROSTATIC PROBE AND A 2-D LDV
INVESTIGATION OF FLAMELETS IN ATURBULENT PREMIXED FLAME WITH A 4 -ELEMENT ELECTROSTATIC PROBE AND A 2-D LDV
复制标题
使用 4 元件静电探针和 2-D LDV 研究湍流预混火焰中的火焰
DOI：
10.1080/00102200108907853
复制
发表时间：
2001
影响因子：
1.9
通讯作者：
F. Williams
中科院分区：
文献类型：
--
作者：
J. Furukawa;Takahiko Suzuki;T. Hirano;F. Williams
摘要：为了研究湍流预混火焰中小火焰的统计数据，并获得其在管流燃烧器上方垂直平面内的燃烧速度分量，小火焰相对于气体的局部运动通过特殊布置的诊断装置进行测量，该诊断装置由带有四个相同传感器的静电探头和双色四光束 LDV 系统组成。利用该技术，首次通过静电探针测量了三维局部火焰前锋速度矢量，同时通过LDV系统测量了垂直燃烧器上方垂直平面内的局部气体速度矢量的轴向和径向分量。从这些结果中可以获得平面小火焰燃烧速度的两个分量，并且发现它们分布在不同的方向上，并且其大小范围从接近零到在未燃烧气体中测量的平面无应变绝热层流燃烧速度的几倍。从这些结果可以得出结论，湍流对小火焰施加可测量的影响，并导致至少其中一些小火焰表现出增加的燃烧速度。
ABSTRACT To investigate the statistics of flamelet in a turbulent premixed flame and to obtain components of their burning velocities in a vertical plane above a pipe-flow burner, the local motion of flamelets with respect to gas are measured by specially arranged diagnostics, composed of an electrostatic probe with four identical sensors and a two-color four-beam LDV system. With this technique, the three-dimensional local flame-front-velocity vector is measured by the electrostatic probe for the first time, and simultaneously the axial and radial components of the local gas-velocity vector in a vertical plane above the vertically oriented burner are measured by the LDV system. Two components of burning velocities of planar flamelets can be obtained from these results and are found to be distributed over different directions and to range in magnitude from nearly zero to a few times the planar, unstrained adiabatic laminar burning velocity measured in the unburnt gas. It may be concluded from these results that turbulence exerts measurable influences on flamelets and causes at least some of them to exhibit increased burning velocity.