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Numerical and experimental study of oscillatory behavior of liquid surface agitated by high-speed gas jet

机译：高速气体射流搅动液面振荡行为的数值和实验研究

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This study examines high-speed air jet impingement on water surface in the penetration mode using CFD simulation and experimental observation. An axisymmetric approach was taken along with the volume of fluid (VOF) method and thek−ωSST turbulence model for simulations. Moreover, a test rig was designed and fabricated to diagnose the phenomenon by tracking the interface motion using a high-speed camera in conjunction with an image processing procedure, and to evaluate the validity of the numerical simulations. Important aspects of the oscillatory behavior of the interface, cavity depth oscillation and rising ligaments and sheets, are addressed in detail. The simulation results offer a very close prediction of the peak frequencies of the cavity oscillation, and the number of ejected liquid sheets and ligaments despite some discrepancies in the range of the cavity motion and the height of ligament and sheets. Induced waves on the interface, and bubbles escaping from the cavity, which are the main source of instability of this two-phase system, are reproduced successfully.
机译：本研究使用CFD模拟和实验观察研究了渗透模式下高速空气射流对水表面的撞击。采取轴对称方法以及流体体积（VOF）方法和k-ωSST湍流模型进行仿真。此外，设计并制造了一种测试设备，以通过结合图像处理程序使用高速相机跟踪界面运动来诊断现象，并评估数值模拟的有效性。界面的振动行为的重要方面，腔体深度的振动以及韧带和薄板的上升都得到了详细说明。模拟结果非常精确地预测了腔体振动的峰值频率，以及尽管腔体运动范围以及韧带和薄板的高度存在一些差异，但喷射的液体薄板和韧带的数量却非常接近。成功地重现了界面上的感应波以及从空腔逸出的气泡，这些气泡是该两相系统不稳定的主要来源。

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