Characterization of the spray atomization process of a multi-hole gasoline direct injector based on measurements using a phase Doppler particle analyser
Characterization of the spray atomization process of a multi-hole gasoline direct injector based on measurements using a phase Doppler particle analyser
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DOI：
10.1177/0954407013483244
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发表时间：
2013-07-01
影响因子：
1.7
通讯作者：
Park, Sungwook
中科院分区：
文献类型：
--
作者：
Lee, Sanghoon;Oh, Yunjung;Park, Sungwook
本实验研究的主要目的是通过表征单射流雾化的基本过程以及空气卷吸和射流相互作用等复杂现象来研究多孔汽油直喷器的喷雾雾化过程。我们测量了液滴的尺寸和速度，使用相位多普勒粒子分析系统在不同的测量距离和不同的喷射压力在平行方向和正交方向上的喷雾传播。此外，我们计算了韦伯数，以进一步表征喷雾雾化过程。我们的实验结果表明，液滴速度遵循类似的趋势，不同的测量距离，但峰值随着距离的增加而减小。此外，在喷射的初始阶段观察到喷雾的前缘，但随着测量距离的增加而消失。通过对雾化液滴直径分布的分析，证实了增加间距和引气对射流雾化过程的影响。当液滴直径小于23 μ m且液滴以低速运动时，在射流两侧的边缘处均观察到空气卷吸，在空气卷吸条件下喷雾雾化过程更加活跃。不同喷射压力的比较证实了喷射压力在液滴破碎中起重要作用。
The main objective of this experimental study was to investigate the spray atomization process of a multi-hole gasoline direct injector by characterizing the basic process of single-jet atomization as well as complex phenomena such as air entrainment and jet interactions. We measured the droplet size and velocity using a phase Doppler particle analysis system at different measurement distances and different injection pressures in both the parallel direction and the orthogonal direction with respect to spray propagation. In addition, we calculated the Weber numbers to characterize further the spray atomization process. Our experimental results showed that the droplet velocities followed similar trends for different measurement distances but that the peak value decreased as the distance increased. Furthermore, a leading edge of the spray was observed at the initial stage of injection but disappeared as the measurement distance increased. Based on the droplet diameter distribution, we confirmed that increasing the distance and air entrainment had effects on the jet atomization process. Air entrainment was seen at the edges of both sides of the jet when the droplet diameter was less than 23 mu m and the droplet was travelling at a low velocity, and the spray atomization process was more activated under air entrainment conditions. A comparison of different injection pressures confirmed that the injection pressure plays an important role in droplet break-up.