Time-resolved droplet size and velocity distributions in a dilute region of a high-pressure pulsed diesel spray
Time-resolved droplet size and velocity distributions in a dilute region of a high-pressure pulsed diesel spray
复制标题
高压脉冲柴油喷雾稀释区域的时间分辨液滴尺寸和速度分布
DOI：
10.1016/j.ijheatmasstransfer.2018.12.147
复制
发表时间：
2019-04
影响因子：
5.2
通讯作者：
Zuohua Huang
中科院分区：
文献类型：
--
作者：
Zehao Feng;Chenglong Tang;Yue Yin;Peng Zhang;Zuohua Huang
本工作的主要目的是对时间分辨喷雾特性进行实验研究。采用双脉冲激光照射下的颗粒/液滴图像分析方法，获得了高压柴油喷雾稀释区的液滴数据。采用欧拉规范描述了在触发喷射后的10个典型时刻固定测试窗口内的瞬时喷雾微观行为。实验结果表明，瞬时喷雾演化可分为三个不同的阶段。在阶段I(潜伏期阶段)，喷嘴形成并到达测试位置，但没有明显观察到离散的液滴。在第二阶段，喷雾通过测试窗口，从测试窗口可以观察到分散的液滴在稀释区分散，液滴的SMD迅速增加。在第三阶段，大量喷雾在测试窗口中消失，只观察到离散的液滴。液滴的SMD被降低到“稳态”值。基于这些采集和处理的数据，得到了液滴尺寸分布函数，并与Rosin-Rammler和Nukiyama-Tanasawa函数进行了比较。最后测定了每个液滴的斯托克斯数和韦伯数，并分析了液滴的运动情况。测量到的液滴随时间变化的行为为喷雾建模和模拟提供了重要的数据。
The principal objective of the present work is to experimentally investigate the time-resolved spray characteristics. Droplets data in a dilute region of a high-pressure diesel spray were obtained by employing the PDIA (particle/droplet image analysis) method with double pulse laser illumination. Eulerian specification was adopted to describe the transient spray microscopic behavior within a fixed test window at ten representative instants after triggering the injection. The experimental results indicate that the transient spray evolution can be characterized in three distinct stages. During stage I (the latency stage), the spray tip develops and reaches the test location, but no discrete droplets were clearly observed. During stage II, the spray passes through the test window, from which discrete droplets are observed to disperse in the dilute region and the SMD of the droplets increases rapidly. During stage III, bulk spray disappears in the test window and only discrete droplets were observed. The SMD of the droplets is decreased to a “steady-state” value. Based on these sampled and processed data, the droplet size distribution functions were obtained and compared with the Rosin-Rammler and the Nukiyama-Tanasawa function. Finally, the Stokes number and the Weber number of each droplet were determined, and the movement of the droplets were analyzed. The measured time dependent droplet behaviors are believed to provide important data for spray modeling and simulation.
登录
查看更多内容
DOI：
10.4271/2015-01-1841
发表时间：
2015-09
期刊：
--
影响因子：
--
作者：
Noritsune Kawaharada;D. Sakaguchi;H. Ueki;M. Ishida
通讯作者：
Noritsune Kawaharada;D. Sakaguchi;H. Ueki;M. Ishida
影响因子：
1.2
作者：
P. Rosin
通讯作者：
P. Rosin
DOI：
10.1016/j.ijmultiphaseflow.2017.02.001
发表时间：
2017-10
影响因子：
3.8
作者：
András Urbán;M. Zaremba;M. Malý;V. Józsa;J. Jedelský
通讯作者：
András Urbán;M. Zaremba;M. Malý;V. Józsa;J. Jedelský
影响因子：
7.5
作者：
Kim, Hyung Jun;Park, Su Han;Lee, Chang Sik
通讯作者：
Lee, Chang Sik
DOI：
10.4271/2013-01-1599
发表时间：
2013-04
期刊：
--
影响因子：
--
作者：
Keisuke Komada;D. Sakaguchi;H. Tajima;H. Ueki;M. Ishida
通讯作者：
Keisuke Komada;D. Sakaguchi;H. Tajima;H. Ueki;M. Ishida