In this work, the flow within an open cubical cavity with an inlet vertical planar jet exposed to an external lateral flow is studied experimentally using stereoscopic time-resolved particle image velocimetry (TR-PIV). The turbulent structure in the near field of the planar jet issuing perpendicularly from a rectangular slot nozzle is evaluated for both vertically upward and downward directions of the discharged jet. For both flow configurations, the jet discharge rectangular nozzle spans 30% of the cavity span leaving a clearance between the jet edge and sidewalls. The working fluid is water, and the complex dynamics of the three-dimensional (3D) flow field is investigated for fixed lateral flow Reynolds number of $Re=3000$ and three nozzle exit Reynolds numbers based on the mean streamwise exit jet velocity and nozzle hydraulic diameter of $R{e}_j=1500,$ 3000 and 5000. The spatial development and structure dynamics of the shear interface instability are analyzed in planes normal to the cavity roof. Flow visualization images of the mean and fluctuating velocity, vorticity and shear strain rate distributions are obtained for upward and downward directions of the slot jet, and spectral analysis of the oscillating instability is performed to describe and quantify the strong shear layer interactions that take place between the discharged eddies of the splitting jet and the external lateral flow.

在这项工作中，使用立体时间分辨粒子图像测速仪（TR-PIV），通过实验研究了开放立方腔内的流体，其中入口垂直平面射流暴露于外部横向流。从矩形狭缝喷嘴垂直发出的平面射流近场中的湍流结构针对排出射流的垂直向上和向下方向进行评估。对于这两种流量配置，喷射喷嘴矩形喷嘴跨度为腔跨度的30％，在喷射边缘和侧壁之间留有间隙。工作流体是水，对于固定的横向流雷诺数，研究了三维（3D）流场的复杂动力学。$\mathrm{[R}Ë=3000$ 和三个喷嘴出口雷诺数，基于平均流向出口射流速度和喷嘴的水力直径 $\mathrm{[R}{Ë}_{Ĵ}=1500，$3000和5000。在垂直于型腔顶的平面上分析了剪切界面不稳定性的空间发展和结构动力学。获得缝隙射流向上和向下方向的均值和脉动速度，涡度和剪切应变率分布的流动可视化图像，并对振荡的不稳定性进行频谱分析，以描述和量化发生在两者之间的强剪切层相互作用分离射流的排出涡流和外部横向流。