极地船蝶阀及管道内不同开度下海水—冰晶两相流流场特性及冲蚀数值模拟

文章以极地船海水冷却系统中的蝶阀及管道为研究对象,在Fluent平台上采用RNG k-ε湍流模型及DPM模型,计算得到了海水—冰晶两相流在蝶阀管道中的流场特性及冲蚀磨损,并选取3个有代表性的蝶阀开度即30°、60°和90°的计算结果进行对比。研究结果发现:蝶阀的开度越大,流场越稳定。各开度下阀板前、后缘与管壁间都存在2个高速区,且阀板前后压差随开度增大而减小,阀板后存在负压区域,涡流现象随开度增大逐渐消失。此外,蝶阀开度越大,蝶阀受到冰晶颗粒的冲蚀磨损越小,最大冲蚀速率也随之减小。研究还得到了蝶阀管道受冲蚀磨损较严重的位置,为船用蝶阀在不同工况下提供科学预测和参考。

Numerical simulation of seawater-ice crystal two-phase flow field and erosion under different opening of butterfly valve and pipeline in polar ship

In this paper,the butterfly valve and pipeline in the seawater cooling system of polar ship are taken as the research object,and the flow field characteristics and erosion wear of seawater-ice crystal two-phase flow in butterfly valve pipeline are calculated by using RNG k-εturbulence model and DPM model on Fluent platform,and the calculation results of three representative butterfly valves,namely 30°,60°and 90°are compared.The results show that the larger the opening of the butterfly valve is,the more stable the flow field is.At each opening,there are two high speed zones between the trailing edge and the tube wall,and the pressure difference between the front and rear of the valve plate decreases with the increase of the opening,and there is a negative pressure area behind the valve plate,and the vortex current phenomenon increases with the opening.The great faded away.In addition,the larger the opening of the butterfly valve is,the smaller the erosion wear of the butterfly valve is by ice crystal particles,and the maximum erosion rate is also reduced.The position of erosion and wear of butterfly valve pipeline is also obtained,which provides scientific prediction and reference for marine butterfly valve under different working conditions.