Numerical simulation on dynamic characteristic of closing process of flow swing check valve
LI Shu-Xun, HOU Ying-Zhe, LI Lian-Cui- Zhou-Shi-Hao
(1.College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2.Machinery Industry Pump and Special Valve Engineering Research Center, Lanzhou, Gansu 730050, China)
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 Fluentbased calculation methods and physical models, dynamic mesh and UDF in closing two kinds of swing check valve, twodimensional 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.
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