邮轮管路系统两相流流动特性仿真分析

Simulation Analysis of Two-phase Flow Characteristics in Pipeline System of Cruise

针对邮轮在极地航行时海水冷却管路系统发生冰堵的问题,基于颗粒动力学理论建立欧拉-欧拉双流体模型耦合相间传质模型,通过实验法和FLUENT数值仿真对比分析两相流流经水平圆管时入口流速和入口含冰率对两相流流态的影响。实验观测与仿真结果表明,海冰移动床的堆积是导致管路发生冰堵的主要因素;提高管道入口两相流速度有利于减弱冰晶颗粒在管道内部的非均匀分布状态,减少移动冰床的堆积;随着入口含冰率的增大,冰晶沿管道截面速度的不对称性分布随之减小,海冰速度场沿管道横截面呈现对称分布。

In view of the problem of ice blocking in the seawater cooling pipeline system of cruise ship during polar voyage, based on particle dynamics theory, an Euler-Euler two-fluid model coupled interphase mass transfer model was established, and the influence of inlet velocity and inlet ice content on the flow pattern of two-phase flow through a horizontal circular tube was compared and analyzed through experimental method and Fluent numerical simulation. Experimental observation and simulation results were highly consistent with each other showing that increasing the two-phase flow velocity at the inlet of the pipeline is beneficial to weaken the non-uniform distribution of ice particles inside the pipeline and reduce the accumulation of moving ice beds. With the increase of ice content in the inlet, the asymmetric distribution of ice crystal velocity along the pipe section decreases, and the sea ice velocity field presents a symmetrical distribution along the pipe section.