| 摘要: |
| 针对圆柱体大角度落水过程多相流动问题，采用VOF多相流模型和重叠网格技术分析了低弗劳德数条件下圆柱体落水过程空泡演化、水动力特性以及尺度效应的影响。结果表明：不同直径的圆柱体落水空泡均发生拉断闭合，且空泡闭合时间随弗劳德数增加而线性增大。除落水抨击和空泡闭合阶段外，升力系数在空泡闭合前的平均增长率比空泡闭合后快。阻力系数从落水撞击至空泡闭合阶段变化一致，但是在空泡闭合后出现分化现象。 |
| 关键词: 圆柱体落水 空泡演化 水动力特性 多自由度运动 |
| DOI： |
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| 基金项目: |
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| Numerical Investigation on Multiphase Hydrodynamic Characteristics for Cylinder Water Entry |
| WANG Cong,XIA Weixue,CHEN Chaoqian |
| (School of Astronautics, Harbin Institute of Technology;Department of Weaponry Engineering, Naval University of Engineering;Northwest Institute of Mechanical and Electrical Engineering) |
| Abstract: |
| This study presents the multiphase flow characteristics and scale effect of compound movement for inclined cylinder in water entry. The VOF multiphase flow model and overset mesh technology are employed to carry out the water entry simulation of cylinder under lower Froude number. The cavity evolution, hydrodynamic characteristics and scale effect are analyzed for the water entry of cylinder with different diameters. Within the scope of initial parameters of current study, the cavity almost occurs deep seal in the water entry of the cylinder with different diameters. The pinch-off time linearly increases with the increase of Froude number. The lift coefficient is similar between the stage of impact and pinch-off stage for different diameter cylinders. Whereas, lift coefficient increases faster for the cylinder with smaller diameter after pinch off. |
| Key words: Cylinder water entry Cavity evolution Hydrodynamic characteristics Compound movement |