通气空泡尾部气泡流仿真和特性分析

向敏 张孜博 屠基元 张为华

doi:10.6052/0459-1879-2011-5-lxxb2010-272

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通气空泡尾部气泡流仿真和特性分析

doi: 10.6052/0459-1879-2011-5-lxxb2010-272

向敏张孜博屠基元张为华

1.
国防科技大学国防科技大学航天与材料工程学院
2.
墨尔本皇家理工大学航空与机械工程学院, 维多利亚 3083, 澳大利亚
3.
皇家墨尔本理工大学航空航天机械及制造工程学院, 澳大利亚, 维多利亚 3083
4.
国防科技大学航天与材料工程学院空间所

详细信息

中图分类号: V211
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出版历程
- 收稿日期: 2010-04-22
- 修回日期: 2011-04-03
- 刊出日期: 2011-09-18

On the numerical study and characteristic analysis of bubbly flow created by ventilated cavity

Min Xiang Zibo Zhang Jiyuan Tu Weihua Zhang

1.
Institute of Aerospace and Material Engineering, National University of Defense Technology, Changsha 410073, China
2.
School of Aerospace, Mechanical and Manufacturing Engineering, RMIT University, Victoria 3083, Australia

摘要

摘要: 基于欧拉-欧拉双流体模型对通气空泡尾部气泡流进行数值仿真, 并采用基于多尺寸分组模型的总体平衡方法预估气泡尺寸分布. 应用改进后湍流耗散系数计算模型, 考虑了气泡体积含量对在湍流作用下气泡扩散现象的影响. 基于上述模型对两种试验工况下流场进行了数值仿真.结果表明模型对空泡尾部回流区特性进行了准确预示, 在回流区高湍流度作用下气泡迅速破碎成小气泡. 并进一步得到试验体尾流区空泡体积分数和速度分布. 尾流区水流速度分布保持了流体经过非流线型对称体时产生的尾流分布规律. 仿真结果与试验数据相一致, 模型适用性得到验证.
- 多尺寸分组
Abstract: Considering the significant influence that the bubblyflow created at the tail of the ventilated cavity makes on the vehiclehydrodynamics and the cavity control mechanism, a Eulerian--Euleriantwo-fluid model was proposed for simulation on the bubbly wakes created byventilated cavity. The population balance approach integrated withMultiple-Size-Group (MUSIG) model was adopted to predict the bubble sizedistribution. Furthermore, a new model for the turbulence dispersioncoefficient was introduced to take into account the effect of void fraction.Based on the simulation model, the characteristics of the multiphase flowfield including a vortex mixing area with high void fraction weresuccessfully captured. The bubbles were found to be broken up into smallones right after entrained into the mixing region due to the high turbulencedissipation rate. The void fraction and velocity distribution in the wakewere obtained to compare with experimental data. The water velocity in thewake was found to be in accordance with the distribution law in the wakecreated by single phase flow passing bluff body. The model was validated inpredicting the bubbly flow created by ventilated cavity for good agreementwith two experimental cases.
- MUSIG