An experimental investigation of impinging 2d planar air jet on a water surface is performed by means of Particle Image Velocimetry (PIV). The difficulty encountered to measure the two dimensional velocity and turbulence fields close to the interface requires a special treatment of the PIV data obtained in the air and water sides. The resulting technique enables the localisation of the moving interface, the use of the inter-correlation and the calculation of statistics in both phases. The results show that the proposed PIV interface detection technique is in good agreement with the LeDaR detection technique developed at the von Karman Institute. The analysis of the air and water velocity field close to the interface highlights the topological differences between dimpling and incipient splashing configurations. The results obtained in this study will serve to model later turbulence transfer in impinging jet configuration.
A single-phase Large Eddy Simulation is performed in a simplified cowl-box model and compared to PIV data. Indeed, prior to the analysis of the interaction between a turbulent air flow and an interface of liquid, the most accurate description of the 3D flow field is required. Although the qualitative phenomena are correctly rendered (flapping motion of impinging inlet jets), quantitative differences are noticed, mainly due to non satisfactory turbulent boundary condition, which induces an overestimation of the jets core length, and modifies its interaction with the cowl box walls. Nevertheless, a qualitative analysis of the instantaneous flow shows the generation of large coherent vortical structures due to the oscillation of the impinging jets at the bottom wall. The advection of these structures in the cowl-box generates large oscillations of wall shear stress and pressure distribution, which are thought to be of great importance for further two-phase flow simulations.
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