耙吸挖泥船高压冲水淹没射流演化过程试验

Experiment on evolution process of high pressure water jet on trailing suction hopper dredger

通过模型试验方法,在风浪流水槽中研究耙吸挖泥船高压冲水淹没射流演化过程。采用超高速相机对静止和移动状态下的高压冲水淹没射流的流动形态进行研究,不仅可提供高压冲水在淹没状态时射流和扩散状态,还可为耙吸挖泥船耙齿设计改进提供依据。结果表明,当高压水射流压力增加到一定程度后,射流形态形成中间大两头小的"藕"形分布状态;试验工况下,在较小射流压力时,移动速度对高压淹没水射流较远处流态影响显著;在较大的射流压力时,移动速度的影响并不明显。因此,提高高压冲水压力可有效解决低压冲水时的拖尾问题。

By the method of model test,we study the evolution process of high pressure flush submerged jet of trailing suction hopper dredger,and use ultra-high speed camera to study the flow pattern of high pressure flush submerged jet in static and moving state.The experiment can not only provide the jet and diffusion state in submerged state,but also provide the basis for improving the design of trailing suction hopper dredger.The results show that when the pressure of ultra-high pressure water jet increases to a certain value,the shape of the jet forms a“lotus root”distribution state with large middle and small middle parts.Under the experimental condition,the moving speed has little influence on the evolution process of ultra-high pressure submerged water jet,and improving the high pressure can effectively solve the tailing problem in low pressure.