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弹体出水引起的非稳态流场数值计算方法

DOI: 10.3969/j.issn.1006-7043.201105079

Keywords: 非稳态流场, 运动非线性, 双峰值, 拍振现象, 双渐近法

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Abstract:

针对双渐近法不能用于分析有初始航速结构或大幅运动结构的流固耦合问题的局限性,在二阶双渐近法的基础上,将运动非线性引入双渐近法,采用改进的双渐近法研究弹体出水砰击引起的非稳态流场,给出了不同阶段的流场动态特性以及各个特征时间点流场动压力的空间分布情况.探讨了弹体出水时双峰值的产生机理、弹体局部结构可能会发生的拍振现象以及空泡区随弹体出水时的变化特征.研究表明弹体出水经历非稳态、稳态、非稳态、稳态4个阶段.

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