Droplet velocity and acceleration measurements in dense sprays by laser flow tagging
Droplet velocity and acceleration measurements in dense sprays by laser flow tagging
复制标题
通过激光流标记测量密集喷雾中的液滴速度和加速度
DOI：
10.1007/s003400000448
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
G. Grünefeld
中科院分区：
文献类型：
--
作者：
S. Krüger;G. Grünefeld
摘要：论证了基于二维激光的流量标记在密集喷雾中测量液相速度的可行性。由于液滴的高数密度、介质的光学厚度以及多重光散射效应，传统技术很难测量密集喷雾中的速度。目前的流标记技术基于磷光示踪分子，该分子由脉冲“写入”激光束网格激发。通过这种方式，可以通过 CCD 相机观察标记的液滴群的运动。此外，通过“液滴组跟踪”执行多个连续速度测量。这会产生沿着不稳定喷雾中各组液滴轨迹的加速度。
Abstract.The feasibility of liquid-phase velocity measurements in dense sprays by 2D laser-based flow tagging is demonstrated. Velocity measurements in dense sprays are difficult with conventional techniques because of the high number densities of droplets, the optical thickness of the medium, and multiple light-scattering effects. The present flow-tagging technique is based on phosphorescent tracer molecules, which are excited by a grid of pulsed ‘write’ laser beams. The motion of the tagged droplet groups can be observed by a CCD camera in this way. In addition, multiple consecutive velocity measurements are performed by ‘droplet-group tracking’. This yields the acceleration along the trajectory of individual groups of droplets in unsteady sprays.