Hatami A, Tadjfar M
Turbulence and Multiphase Flow Laboratory, Department of Aerospace Engineering, Amirkabir University of Technology, Tehran, Iran.
Sci Rep. 2024 Sep 12;14(1):21360. doi: 10.1038/s41598-024-72106-7.
An experimental study to investigate the flow of liquid jet issued from a high aspect ratio nozzle slit into an incoming airflow by changing the orientation angle from the incoming free-stream was performed. A two-dimensional liquid sheet emerged from the narrow slit into the subsonic air crossflow. Different orientation angles between 0 and 90 degrees were studied. High-speed photography and shadowgraphy techniques were utilized to visualize the flow physics. The influence of the slit orientation angle on the flow morphology and the flow regimes of liquid sheets was investigated. Some fluid flow parameters were obtained by analyzing the images. The changes in breakup height of different orientations were measured. A model was offered for the breakup height of the liquid sheet based on the liquid-to-gas momentum ratio, gas Weber number, and a new non-dimensional parameter as a representation of the angle of slit orientation. Also, the defined sheet trajectory for each orientation angle was obtained, and the variations were examined. Empirical correlations for the defined trajectory of the sheet in terms of liquid to gas momentum ratio and gas Weber number for each orientation angle were proposed.
进行了一项实验研究，通过改变与来流自由流的取向角，研究从高纵横比喷嘴狭缝喷出的液体射流进入来流气流中的流动情况。二维液膜从狭窄狭缝进入亚音速横向气流。研究了0到90度之间的不同取向角。利用高速摄影和阴影成像技术来可视化流动物理过程。研究了狭缝取向角对液膜流动形态和流动状态的影响。通过分析图像获得了一些流体流动参数。测量了不同取向的破碎高度变化。基于液气动量比、气体韦伯数以及作为狭缝取向角表示的新无量纲参数，给出了液膜破碎高度的模型。此外，还获得了每个取向角的定义液膜轨迹，并对其变化进行了研究。针对每个取向角，提出了液膜定义轨迹与液气动量比和气体韦伯数之间的经验关联式。
