Two-phase SLIPI for instantaneous LIF and Mie imaging of transient fuel sprays.
Two-phase SLIPI for instantaneous LIF and Mie imaging of transient fuel sprays.
复制标题
用于瞬态燃料喷雾的瞬时 LIF 和 Mie 成像的两相 SLIPI。
作者：
M. Storch;Y. N. Mishra;M. Koegl;E. Kristensson;S. Will;L. Zigan;E. Berrocal
在这封信中，我们报告了一个两相结构的激光照明平面成像[双脉冲SLIPI（2 P-SLIPI）]光学设置，其中的“线结构”是空间移位，利用方解石晶体的双折射性能。通过使用该光学组件和两个交叉偏振激光脉冲，调制图案的移位不再是“时间限制”的。因此，两个子图像的空间不匹配的相位可以被记录在几百纳秒内，冻结的照明瞬态流的运动。与以前的基于结构化照明的瞬时成像装置相比，当前的光学设计具有单光路的优点，大大简化了其复杂性。由于它的优点，抑制从多重光散射的影响，2 p-SLIPI技术在这里应用于光学密集的多射流直接喷射火花点火（DISI）乙醇喷雾。通过Mie散射和液体激光诱导荧光同时检测，研究了燃油喷射后多分散液滴的快速形成和空穴的出现。结果允许显着改善的喷雾结构的分析。
We report in this Letter a two-phase structured laser illumination planar imaging [two-pulse SLIPI (2p-SLIPI)] optical setup where the "lines structure" is spatially shifted by exploiting the birefringence property of a calcite crystal. By using this optical component and two cross-polarized laser pulses, the shift of the modulated pattern is not "time-limited" anymore. Consequently, two sub-images with spatially mismatched phases can be recorded within a few hundred of nanoseconds only, freezing the motion of the illuminated transient flow. In comparison with previous setups for instantaneous imaging based on structured illumination, the current optical design presents the advantage of having a single optical path, greatly simplifying its complexity. Due to its virtue of suppressing the effects from multiple light scattering, the 2p-SLIPI technique is applied here in an optically dense multi-jet direct-injection spark-ignition (DISI) ethanol spray. The fast formation of polydispersed droplets and appearance of voids after fuel injection are investigated by simultaneous detection of Mie scattering and liquid laser-induced fluorescence. The results allow for significantly improved analysis of the spray structure.
影响因子：
1.9
作者：
Charalampous, Georgios;Hardalupas, Yannis
通讯作者：
Hardalupas, Yannis