湍流模型对截止阀内流场模拟影响研究OA

Computational fluid Dynamics(CFD)is an important means to study the internal flow field of valves.The selection of turbulence models plays a decisive role in the accuracy of simulation results.This paper takes the globe valve with standard flange as research object,and conducts CFD simulations,using different turbulence models respectively,on flow field within valve.The simulated results are compared and analyzed from the aspects of velocity distribution,vortex structure characteristics and flow coefficient.The results show that there are some velocity zonesinflow field inside the valve,and the phenomena such as backflow,separationoccur in local positions with large velocity gradient,leading to the formation of fluid vortex structures.The accuracy of standard k-e model is not enough for flow field simulation in valve,while the SST k-ω model can take both the calculation efficiency and accuracy into account.The LES model is suitable for high-resolution identification of local flow field.