非定常火焰放热区突发模式OH / CH2O平面激光诱导荧光成像

2019/07/23   下载量： 0 次

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采用LaVision的突发式PLIF测量系统及双像器，对非定常火焰放热区进行了突发模式OH/CH2O平面激光诱导荧光成像测量研究。

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The paper presents simultaneous high-speed (7.5 kHz) planar laser-induced
fluorescence (PLIF) of formaldehyde (CH2O) and the hydroxyl-radical (OH) for visualization
of the flame structure and heat release zone in a non-premixed unsteady CH4/O2/N2 flame.
For this purpose, a dye laser designed for high-speed operation is pumped by the secondharmonic
532 nm output of a Nd:YAG burst-mode laser to produce a tunable, 566 nm beam.
After frequency doubling a high-energy kHz-rate narrowband pulse train of approximately
2.2 mJ/pulse at 283 nm is used for excitation of the OH radical. Simultaneously, CH2O is
excited by the frequency-tripled output of the same Nd:YAG laser, providing a highfrequency
pulse train over 10 ms in duration at high pulse energies (>100 mJ/pulse). The
excitation energies enable signal-to-noise ratios (SNRs) of ~10 and ~60 for CH2O and OH
PLIF, respectively, using a single high-speed intensified CMOS camera equipped with an
image doubler. This allows sufficient SNR for investigation of the temporal evolution of the
primary heat release zone and the local flame structure at kHz rates from the spatial overlap
of the OH- and CH2O-PLIF signals.

上一篇 在一个双稳湍流涡旋火焰中，对间歇性动态的时间-频率定位
下一篇 在惯性主导区域下落液体薄膜上的孤立波

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北京欧兰科技发展有限公司
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