基于CFD技术的疏浚工程管道缩口性能分析

Performance analysis of pipeline necking in dredging engineering based on CFD technology

疏浚工程管道缩口是在船舶吹填过程中控制主机负荷和增大泥浆喷洒面积常用的装置,现有的水力计算中缩口的出口直径是影响管道阻力特性的重要参数,但是对于缩口的锥角性能研究成果较少。采用CFD数值模拟方法对某依托工程中采用的两种缩口方案的喷射出流段流场进行计算,分析两种缩口方案的水力损失和水流离开缩口后的收缩情况,对比了两种方案的流速分布特点和优劣势,评价了现用的水力学方法计算缩口水力损失的偏差和影响因素,为类似疏浚工程缩口方案的确定提供技术基础。

Dredging project pipeline necking was a commonly used device to control the load of the main engine and increase the mud spraying area during the ship′s filling process.The existing hydraulic calculation of the outlet diameter of the shrinkage was an important parameter affecting the resistance characteristics of the pipeline.There were few research results on cone necking angle performance.The CFD numerical simulation method was used to calculate the flow field of the ejection section of the two necking schemes used in a supporting project,and the hydraulic loss of the two necking schemes and the shrinkage of the water flow after leaving the necking were analyzed.The flow velocity distribution characteristics and advantages and disadvantages of the two schemes were compared,and the deviations and influencing factors of the hydraulic loss were calculated by the existing hydraulic methods,which could provide a technical basis for the determination of similar schemes for dredging projects.