摘要
基于Fluent软件提供的计算方法和物理模型,利用动网格及用户自定义函数技术对轴流式止回阀的阀瓣运动过程进行动态数值模拟.通过动网格较好地解决了因阀瓣运动而导致的计算区域瞬时变化的问题.利用CFD软件Fluent,采用非结构化网格,标准k-ε湍流模型,模拟了阀瓣关闭的动态过程中,止回阀内压力场和速度场的瞬态变化过程,计算出动态特性曲线,并进行了相应的试验验证.结果表明:运用动网格技术能较好地模拟止回阀内部压力和速度的动态变化,试验结果与数值计算结果趋于一致,验证了数值模拟的可靠性.通过数值模拟不同公称直径和外力下止回阀内的压力场和速度场的瞬态变化,计算出对应的动态特性曲线,并总结了止回阀的公称直径和外力对其动态特性的影响结果,对工程设计与管理具有指导作用.
The unsteady fluid flow caused from the moving disc in an axial flow check valve was nu- merically simulated by means of the computational methods and flow physical models available in CFD code-Fluent. The disc regularly instantaneous movement was realized by the dynamic mesh technique and UDF （user defined function） in Fluent. The transient pressure and velocity were obtained during a period of the disc being closed by means of unstructured mesh, the standard k - e turbulence model. Those transient characteristic curves have been measured experimentally as well, and exhibit good a- greement with the predicted ones, suggesting the numerical simulation method is reliable. Moreover, such dynamic characteristic curves were calculated in the valves in various nominal diameters and ex- ternal forces and their influences have been identified. Those results will play a critical role in investi- gation into water hammer effect in the axial flow check valve, and might be useful for check valve de- sign in engineering projects.
出处
《排灌机械工程学报》
EI
北大核心
2013年第1期46-49,55,共5页
Journal of Drainage and Irrigation Machinery Engineering
基金
甘肃省自然科学基金资助项目(1014RJZA023)
关键词
止回阀
动网格
用户自定义函数
动态特性
数值模拟
check valve
dynamic mesh
user defined function
dynamic characteristics
numerical simulation
