Simultaneous planar and volume cross-LIF imaging to identify out-of-plane motion
Simultaneous planar and volume cross-LIF imaging to identify out-of-plane motion
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同时进行平面和体积交叉 LIF 成像以识别平面外运动
DOI：
10.1016/j.proci.2014.07.042
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发表时间：
2015
影响因子：
3.4
通讯作者：
Meares S
中科院分区：
文献类型：
--
作者：
Meares S
介绍了一种新的方法来识别平面外运动的存在，这种运动历史上一直困扰着在湍流火焰中演化的反应结构的平面测量。该技术结合了激光诱导羟基自由基荧光(P-V-XLIF-OH)的平面(P)和体积(V)交叉成像(V与P垂直)。两台脉冲频率为10 kHz的高速脉冲染料激光器被调谐到283.01 nm处的OH跃迁。一束光束形成厚度小于120千μ米的激光薄片，而另一束光束形成3.4万亿毫米厚的体积。激光薄片(P)横穿射流的中部，而厚的体积(V)与激光薄片成90度角定向，并对齐以覆盖火焰的外部边缘。使用两个独立的增强型cmos相机，以10千赫兹的重复频率工作，在接近喷发的火焰范围内收集了OH的平面和体积交叉LIF图像序列。平面-体积重叠被标记在相应的关节图像上，以使得能够识别OH结构是否已经移动到平面外。以可压缩天然气(CNG)湍流引导非预混火焰为试验台，研究表明，虽然离面运动对采样图像的平均影响约为12%，但这对测量的OH结构的“破裂”和“闭合”速率几乎没有影响。在这里测量到的相同火焰是用包含详细化学成分的大涡模拟计算出来的。两种技术既模拟了实验装置，也使用了局部方位向速度来识别平面外运动，发现支持测量的结论。
A novel approach is introduced to identify the presence of out-of-plane motion that has historically plagued planar measurements of reactive structures evolving in turbulent flames. The technique combines planar (P) and volume (V) cross imaging (V orthogonal to P) of laser-induced fluorescence from the hydroxyl radical (P-V-XLIF-OH). Two high-speed Nd:YAG-pumped dye lasers with a pulsing rate of 10 kHz, are tuned to a transition of OH at 283.01 nm. One beam is formed into a laser sheet, less than 120 μm thick while the other beam is formed into a volume that is 3.4 mm thick. The thin laser sheet (P) traverses the middle of the jet, while the thick volume (V) is oriented at 90 degrees to the thin laser sheet and aligned to cover the outer edges of the flame. Sequences of planar and volume cross-LIF images of OH are collected in a range of flames approaching blow-off using two separate intensified CMOS cameras operating at a repetition rate of 10 kHz. The plane-volume overlap is marked on the respective joint images to enable the identification of whether OH structures have moved out-of-plane. Using turbulent piloted non-premixed flames of compressible natural gas (CNG) as a test-bed, it is shown that while out-of-plane motion impacts an average of around 12% of the sampled images, this has little effect on the measured rates of “breakages” and “closures” of OH structures. The same flames measured here were computed using Large Eddy Simulations with detailed chemistry. Two techniques mimicking both the experimental set-up and also using the local azimuthal velocity to identify out-of-plane motion were found to support the conclusions of the measurements.
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影响因子：
4.4
作者：
G. Kuenne;F. Seffrin;Frederik Fuest;Thabo Stahler;A. Ketelheun;D. Geyer;J. Janicka;A. Dreizler
通讯作者：
G. Kuenne;F. Seffrin;Frederik Fuest;Thabo Stahler;A. Ketelheun;D. Geyer;J. Janicka;A. Dreizler
影响因子：
4.4
作者：
V. N. Prasad;A. Masri;S. Navarro-Martinez;K. Luo
通讯作者：
V. N. Prasad;A. Masri;S. Navarro-Martinez;K. Luo
濒临灭绝的甲烷湍流非预混火焰：拉曼测量的平均结构
影响因子：
4.4
作者：
A. Masri;R. Bilger;R. Dibble
通讯作者：
R. Dibble
甲烷-空气扩散火焰的大涡模拟
DOI：
10.1007/s10494-008-9143-5
发表时间：
2008
期刊：
Flow, Turbulence and Combustion
影响因子：
--
作者：
D. Clayton;W. Jones
通讯作者：
W. Jones