水下贴底射流及其对淤泥质床面冲刷实验研究

Experimental studies on erosion of silt bed by submerged circular wall jets

本文对水下圆截面贴底射流所产生的流速场及其对周围淤泥质床面的冲刷作用进行了实验研究，通过定床和动床两个系列的射流实验。

This paper presents the experimental studies about the mixing, diffusion and erosion of circular turbulent wall jets. Two series of experiments were performed. The first series was on the fixed bed, whereas the second series was on the movable silt bed. In the fixed bed experiments,the variation of velocity scales and the length scales with the axial distance from the nozzle was investigated. In the second series experiments, the variation of the eroded bed profiles with the jet velocity was observed, and the critical erosion shear velocity was obtained. The empirical formulas have been established so that one could predict the velocity field near bed plane and the scoured hole sizes.