气液射入压载水排放管中混合过程的数值模拟  

Numerical Simulation of Gas-liquid Jet to the Ballast Water Discharge Pipe Crossflow

作　　者：谷建龙[1,2] 张芝涛[1] 胡吉敏[3] 张江华 

机构地区：[1]大连海事大学环境工程研究所,辽宁大连116026 [2]云南省科学技术情报研究院,云南昆明650051 [3]昆明理工大学电力工程学院,云南昆明650051 [4]鞍山市第二十五中学,辽宁鞍山114014

出　　处：《应用基础与工程科学学报》2009年第5期725-736,共12页Journal of Basic Science and Engineering

基　　金：国家科技支撑计划重点项目(2006BAC11B06);国家重点基础研究发展计划(2008CB417203)

摘　　要：利用高效活性自由基在压载水排放管路中杀灭致死有害入侵微小生物,可解决目前各国海洋生态环境保护亟待解决的生物入侵问题.横流环境中的垂直射流,能够产生强卷吸反向涡旋对,具有较好的混合效果,以此实现气液携带的活性自由基与压载水在短距离的管路中快速均匀混合,以便使活性自由基充分接触并杀灭入侵微小生物.拟采用较成熟的假设各相均为连续相的Eulerian-Eulerian双流体模型对T型管路结构进行数值模拟,分析气体体积分数在管路中的演变,来表征射流与横流的混合过程.结果显示,沿横流横断面上,气体体积分数存在反向涡旋对,在横流纵剖面上,可以明显看到紊动射流的起始段、弯曲段和顺流段,其气体分数分布区的发展类似于单相自由射流.不同流速比的流场演变,因受壁面约束形成独特的结构特征,同时说明冲击射流在短距离内更有利于快速混合.Biological invasion caused by ship＇ s ballast water has become the focus of international marine environment protection, reactive free radicals has been researched in order to solve the issue by killing vertically jetted the invasive microbes in the ballast water discharging-pipe. When liquid is into cross flow, counter-rotating vortex pairs with strong entrainment will be generated, leading to good mixture effect, meanwhile gas-liquid mixture carrying reactive free radicals could blend rapidly into ballast water in the pipeline and completely kill invasive microbes. In the paper, the model of Eulerian-Eulerian two equations is employed to simulate the evolving and mixing process of gas volume fraction in tee pipe. The results show that there are counter-rotating vortex pairs in the vertical x-sections and start phase, bent-over phase and parallel cross flow phase of gas volume fraction in the vertical z-section, the development of volume fraction distribution is similar to scalar field of single-phase free jet. Unique characteristics are presented by various velocity ratio because of the confining wall. At same time, the impinging jet is a good option for rapid mixing in limited time and short pipe.

关 键 词：约束横流 气液紊动射流 Eulerian-Eulerian双流体模型 气体体积分数 压载水处理 

分 类 号：O358[理学—流体力学]