In this study, local scour occurring downstream from a nozzle with and without plates formed in cohesionless materials was investigated experimentally. The experiments were performed to determine scour geometry, maximum scour depth, and the effect of aeration on scour for water jets impinged obliquely into the downstream pool. Dimensionless variables affecting the scour were determined as densimetric Froude number, dimensionless impingement length, and the ratio of densimetric Froude number to dimensionless impingement length. Experiments were conducted for three nozzle diameters with plates, three nozzle diameters without plates, two different impingement lengths, and three different exit velocities. The results of the experiments showed that the use of the plates in the nozzle, jet impact velocity, jet shape, jet expansion, jet impingement length, and air entrainment rate were critical parameters for scour geometry. As a result, it was found that the jets from a nozzle with plates entrained more air bubbles into the impingement pool than jets from nozzles without plates, thereby decreasing maximum scour depth by spreading the scour over a larger area. This was evident by increasing the impingement length. In addition, scour equations were obtained to determine maximum scour depth, ridge height, and scour hole length from experimental data.

在这项研究中，实验研究了发生在无胶粘材料中形成和不形成板的喷嘴下游的局部冲刷。进行实验以确定冲刷几何形状，最大冲刷深度以及曝气对斜向下游池注水的冲刷效果。确定影响冲刷的无量纲变量为密度弗劳德数，无因次撞击长度以及密度弗劳德数与无因次撞击长度之比。针对具有板的三种喷嘴直径，无板的三种喷嘴直径，两种不同的冲击长度以及三种不同的出口速度进行了实验。实验结果表明，喷嘴中板的使用，射流冲击速度，射流形状，射流膨胀，射流冲击长度和空气夹带率是冲刷几何形状的关键参数。结果，发现来自带有板的喷嘴的射流比没有板的喷嘴的射流夹带更多的气泡进入冲击池，从而通过将冲刷散布在更大的区域上而减小了最大冲刷深度。通过增加冲击长度可以明显看出这一点。另外，获得了冲刷方程式，以根据实验数据确定最大冲刷深度，脊高和冲刷孔长度。通过增加冲击长度可以明显看出这一点。另外，获得了冲刷方程式，以根据实验数据确定最大冲刷深度，脊高和冲刷孔长度。通过增加冲击长度可以明显看出这一点。另外，获得了冲刷方程式，以根据实验数据确定最大冲刷深度，脊高和冲刷孔长度。