Simultaneous dual-plane CH PLIF, single-plane OH PLIF and dual-plane stereoscopic PIV measurements in methane-air turbulent premixed flames
Simultaneous dual-plane CH PLIF, single-plane OH PLIF and dual-plane stereoscopic PIV measurements in methane-air turbulent premixed flames
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DOI：
10.1016/j.proci.2010.05.026
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
M. Shimura;Ueda Takashi;G. Choi;M. Tanahashi;T. Miyauchi
中科院分区：
文献类型：
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作者：
M. Shimura;Ueda Takashi;G. Choi;M. Tanahashi;T. Miyauchi
采用双平面激光诱导荧光法（PLIF）、单平面激光诱导荧光法（PLIF）和双平面立体粒子图像测速法（PIV）同时测量甲烷-空气湍流预混火焰的三维结构。双平面CH PLIF系统由两个独立的传统CH PLIF测量系统组成，每个激光系统的激光束利用偏振差导致平行光通，在两个平行的二维截面上进行CH PLIF测量。利用波长差建立了双平面立体PIV。双平面CH PLIF和立体PIV与单平面OH PLIF相结合。用于单平面OH - PLIF的激光片位于CH - PLIF和立体PIV两个平面的中心。各平面间距设置为170μm左右。PIV的空间分辨率设置为175μm（约为Kolmogorov长度尺度的3倍）×175μm×210μm，与一般湍流直接数值模拟（dns）的空间分辨率相同。同时测量可以得到三维火焰前缘、3个速度分量和9个速度导数。在Reλ=63.1, 95.0和115.0的甲烷-空气涡流稳定湍流预混火焰中进行了测量。在高雷诺数湍流预混火焰中，可以观察到先前三维dns所显示的各种复杂的三维火焰结构，如握把结构和尖顶结构。应变速率的大小由9个速度导数计算得出，除被燃烧气体吞没的区域外，未燃烧区域的应变速率值较高。这些结果表明，双平面CH PLIF、单平面OH PLIF和双平面立体PIV同时测量对于研究湍流预混火焰的特性是有用的。
Simultaneous dual-plane CH planar laser induced fluorescence (PLIF), single-plane OH PLIF and dual-plane stereoscopic particle image velocimetry (PIV) measurement has been developed to investigate three-dimensional structures of methane–air turbulent premixed flame. Dual-plane CH PLIF system consists of two independent conventional CH PLIF measurement systems and laser beams from each laser system are led to parallel optical pass using the difference of polarization, and CH PLIF is conducted in two parallel two-dimensional cross-sections. Dual-plane stereoscopic PIV was established by using the difference of wavelength. The dual-plane CH PLIF and stereoscopic PIV are combined with single-plane OH PLIF. The laser sheet for single-plane OH PLIF is located at the center of two planes for CH PLIF and stereoscopic PIV. The separation between each plane is set to about 170μm. The spatial resolution of PIV is set to 175μm (about three times Kolmogorov length scale)×175μm×210μm and is same as that of general direct numerical simulations (DNSs) of turbulence. This simultaneous measurement can provide three-dimensional flame front, three velocity components and nine velocity derivatives. The measurement is conducted in methane–air swirl-stabilized turbulent premixed flames of Reλ=63.1, 95.0 and 115.0. Various complicated three-dimensional flame structures such as the handgrip and spire structures, which have been shown by previous three-dimensional DNSs, are observed in high Reynolds number turbulent premixed flames. Magnitude of strain rate, which is evaluated from nine velocity derivatives, shows high value in unburnt region except for the region engulfed by burnt gas. These results show that the simultaneous dual-plane CH PLIF, single-plane OH PLIF and dual-plane stereoscopic PIV measurement is useful for investigating the characteristics of turbulent premixed flames.