流体机械

2018, v.46;No.550(04) 29-33

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基于动网格的蝶阀启闭过程的数值模拟研究
Numerical Simulation and Research on Opening and Closing Process of Butterfly Valve Based on Dynamic Mesh

叶志烜;胡春艳;刘建峰;余宏兵;陶国庆;
YE Zhi-xuan;HU Chun-yan;LIU Jian-feng;YU Hong-bing;TAO Guo-qing;Hefei General Machinery Research Institute Co.,Ltd.;

摘要(Abstract):

通过对中线蝶阀启闭过程中的流场进行二维动态数值模拟计算,得到了不同开度下阀后流体涡旋的演化规律。结果表明:随着开度的减小,流体经过蝶阀后,在蝶阀下游形成了一对旋向相反的对称涡,进而发展成非对称涡,最终演变成为多个非对称涡结构。同时,流体经过蝶阀后在蝶板下游边缘发生空化,当开度在14°左右时,气含率达到最大值0.79。空化促进了局部小尺度涡的产生,小尺度涡的发展和消亡加剧了蝶板运行过程中的振动,进而产生噪声。
Two-dimensional dynamic numerical simulation was carried out on the flow field of center line type butterfly valve in its opening and closing process,and the evolution law of downstream vortex flow was obtained at different opening angles. The results show that with the decrease of the opening,after the fluid flows through the butterfly valve,a pair of symmetrical vortexes with opposite direction of rotation appears in the downstream of the butterfly valve,which further develop into asymmetric vortexes and eventually evolve into the structure of multiple asymmetric vortexes. At the same time,cavitation occurred at the edge downstream of the valve disc after the fluid flows through the valve,and when the opening angle is about 14°,the gas volume fraction reaches the maximum value of 0.79. Cavitation promotes the production of local small scale vortex,whereas the development and collapse of the small scale vortex aggravate the vibration in the operation process of the valve disc,eventually resulting in noise.

关键词(KeyWords): 蝶阀;动网格;涡旋;空化;数值模拟
butterfly valve;dynamic mesh;vortexes;cavitation;numerical simulation

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作者(Author): 叶志烜;胡春艳;刘建峰;余宏兵;陶国庆;
YE Zhi-xuan;HU Chun-yan;LIU Jian-feng;YU Hong-bing;TAO Guo-qing;Hefei General Machinery Research Institute Co.,Ltd.;

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