Simultaneous high-speed planar imaging of mixture fraction and velocity using a burst-mode laser
Simultaneous high-speed planar imaging of mixture fraction and velocity using a burst-mode laser
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使用突发模式激光对混合物分数和速度进行同步高速平面成像
DOI：
10.1007/s00340-013-5665-1
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
J. Gord
中科院分区：
文献类型：
--
作者：
Joseph D. Miller;J. Michael;M. Slipchenko;Sukesh Roy;T. Meyer;J. Gord
同时高速定量成像的混合物分数和速度证明使用的四次和二次谐波输出，分别是一个突发模式的Nd：YAG激光。与以前使用突发模式和连续脉冲二极管泵浦固体激光器测量混合物分数相比，记录长度增加了10倍，每脉冲能量增加了16倍。高输出能量用于定量，高速混合分数成像与丙酮平面激光诱导荧光，这也使得同时粒子为基础的测速没有粒子散射的干扰。一个半定量模型被用来确定四次谐波输出能量的限制，由于瞬态吸收和热相位失配的影响，在一定范围内的重复率。湍流射流（雷诺数为15，000）内的混合数据，并与已知的湍流混合定律和以前公布的数据进行比较，验证。
Simultaneous high-speed quantitative imaging of mixture fraction and velocity is demonstrated using the fourth- and second-harmonic outputs, respectively, of a burst-mode Nd:YAG laser. A tenfold increase in the record length and 16-fold increase in per-pulse energy are achieved compared with previous measurements of mixture fraction using burst-mode and continuously pulsed diode-pumped solid-state lasers, respectively. The high output energy is used for quantitative, high-speed mixture-fraction imaging with acetone planar laser-induced fluorescence, which also enables simultaneous particle-based velocimetry without interference from particle scattering. A semiquantitative model is used to determine the limitations on fourth-harmonic output energy due to the effects of transient absorption and thermal phase mismatch over a range of repetition rates. Data are presented for mixing within a turbulent jet (Reynolds number of 15,000) and are validated by comparisons with known turbulent mixing laws and previously published data.