This paper presents an experimental study of the liquid disintegration process on an atomizer with two counter-rotating wheels by high-speed imaging. The process was investigated for a wide range of wheel rotational speeds, liquid flow rates and impingement positions. Compared to flat disc and cup atomizers operating at similar Weber numbers, proposed atomizer design is capable of producing much finer droplets in the ligament formation mode (mean diameter under 0.15 mm when We = 10⁶) and at a significantly larger liquid throughput. Despite the atomizer gap flow complexity, approximation of mean liquid trajectories with tangent lines proved to be fairly accurate. We were able to identify two main challenges in atomizer operation, namely the occurrence of hydraulic jump upon liquid impingement causing the formation of large droplets, and escaping of the liquid spray through the wheel gap. Nevertheless, both issues can be largely mitigated by optimization of atomizer geometry and operating parameters.

本文通过高速成像技术对带有两个反向旋转轮的雾化器中的液体崩解过程进行了实验研究。对这一过程进行了广泛的轮转速，液体流速和冲击位置研究。与以相似韦伯数操作的平板和杯形雾化器相比，建议的雾化器设计能够在韧带形成模式下产生更细的液滴（当We = 10 ⁶时，平均直径小于0.15 mm）并以更大的液体通过量。尽管雾化器间隙流动很复杂，但用切线近似平均液体轨迹仍是相当准确的。我们能够确定雾化器运行中的两个主要挑战，即在液体撞击时出现水力跳跃，从而导致大液滴的形成，以及液体喷雾通过轮间隙逸出。尽管如此，通过优化雾化器的几何形状和运行参数可以大大缓解这两个问题。