摘要
针对旋启式止回阀关闭时出现的水击现象,采用计算流体动力学(CFD)方法,建立了阀瓣的运动方程和二维几何模型,以连续性方程、雷诺平均N-S方程和基于各向同性涡黏性理论的k-ε方程组成旋启式止回阀内部流动数值模拟的控制方程组,借助Fluent软件提供的计算方法和物理模型,利用动网格及其UDF编程(用户自定义函数)技术,对普通和改进后2种模型的关闭过程进行非定常流动的二维数值模拟计算,获得了阀门内部流场的压力场图、速度矢量图、压力曲线图以及速度曲线图.结果表明:原模型在关闭过程中会出现大幅度的波动,而改进后的止回阀只出现小幅度的波动,突变的发生率减小,流动更加稳定,流通能力提高,流体对阀瓣的冲击以及局部的能量损耗降低.研究结果为分析阀门关闭时的水击现象提供了依据.
Regarding the water hammer phenomenon in closing swing check valve,by applying computational fluid dynamics（CFD） method,a motion equation of valve clack and the 2D geometric model were built;with the control equations composed of continuity equation,Reynolds average N-S equations and the k-ε turbulence model based on the theory of isotropic eddy viscosity,by using Fluent-based calculation methods and physical models,dynamic mesh and UDF in closing two kinds of swing check valve,two-dimensional numerical simulation of the internal unsteady flow was performed.From the simulation,the pressure field,velocity vector,pressure curve and velocity curve of the internal unsteady flow were obtained.The results show that,in closing,the original model fluctuated;while the modified model fluctuated slightly,reducing the possibility of sudden changes;the internal flow field became more stable and the flow capacity was improved,the impact of the fluid on valve clack and local energy loss were decreased.The research can be an important reference for swing check valve design and helpful in optimizing valve design.
出处
《排灌机械工程学报》
EI
北大核心
2013年第4期335-339,344,共6页
Journal of Drainage and Irrigation Machinery Engineering
基金
兰州理工大学"优秀青年教师培养计划"资助项目(Q201002)
科技部科技人员服务企业行动资助项目(2009GJG10005)
关键词
旋启式止回阀
关闭过程
动网格
水击现象
数值模拟
swing check valve
closing process
dynamic mesh
water hammer phenomena
numerical simulation
