耙头高压冲水与高压冲水泵匹配性研究

Matching performance study of draghead high-pressure jet water and jet pump

以上航局3000 m3等级耙吸挖泥船建造项目为依托,结合项目中4500 m3耙吸挖泥船耙头研制,深入研究耙臂冲水管系沿程阻力及喷嘴布置对耙头冲水的影响。采用数值模拟方法对4500 m3耙吸挖泥船耙头高压冲水管路及喷嘴流速进行了计算,依据高压冲水泵性能曲线开展工况点的匹配性分析。针对喷嘴附近局部过流面的流场分布,进一步优化耙头内部高压冲水过流区域形状和喷嘴结构形式,有效降低管路阻力,减小了高压冲水沿耙臂管路输送至喷嘴过程的能量损失,显著提高了喷嘴冲水流速,形成了与高压冲水泵工况点相匹配的耙头冲水管系和喷嘴设计方案。

Based on the construction project of 3000 m3 trailing suction hopper dredger of the CCCC Shanghai Dredging Co.,Ltd.,combined with the development of the draghead of 4500 m3 trailing suction hopper dredger in the project,the influence of the resistance along the drag arm jet water pipe system and the nozzle arrangement on the draghead jetting were studied.The flow velocity of the high-pressure jet pipeline and nozzle of the draghead of 4500 m3 trailing suction hopper dredger was calculated by numerical simulation method,and the matching analysis of working points was carried out according to the performance curve of the high-pressure jet water pump.According to the flow field distribution of local flow surface near the nozzle,further optimize the shape of high-pressure flushing flow area and nozzle structure in the draghead,effectively reduce the pipeline resistance,reduce the energy loss in the process of high-pressure jet water transported to the nozzle along the drag arm pipeline,and significantly improve the nozzle jet water flow rate,and form the design scheme of draghead jet water pipe system and nozzle matching with the working point of high-pressure jet pump.