管阀内油水环状流稳定性的流固耦合分析

Stability Analysis of Oil-Water Annular Flow in Tube Valve under Fluid-Solid Coupling

为了研究管阀与两相流相互作用下的油水环状流稳定性,结合流固耦合模型和VOF模型,进行管阀与油水环状流的双向流固耦合分析,对管壁变形及剪切应力、油相体积分布、速度场进行数值模拟分析。结果表明,管壁变形与壁面剪切力作用的大小与面积随球阀开度变化而变化,管壁变形对油水环状流产生影响。在较小的球阀开度下,流固耦合对阀下游油水两相分布、漩涡强度有明显影响,容易使油水环状流失稳。而在大开度下,流固耦合对环状流无明显影响。在实际开闭阀门操作中应快速反应,减少阀门在小开度过程中的反应时间。

Based on the fluid-sold coupling model and VOF model,the stability of oil-water annular flow under the interaction between tube valve and two-phase flow was studied,the bidirectional coupling between tube valve and oil-water annular flow was analyzed,and the deformation of pipe wall and the shear stress on the pipe wall,the volume distribution of oil phase and velocity field were simulated.The results show that the magnitude and area of the wall deformation and wall shear stress vary with the opening of ball valve,and the tube wall deformation has an impact on the oil-water annular flow:Underthe smaller opening of the ball valve,the fluid-solid coupling has an obvious influence on the oil-water phase distribution and vortex strength in the downstream of the ball valve,which easily leads to the instability of the oil-water annular flow.However,under the large opening of the ball valve,the fluid-solid coupling has no obvious effect on the oil-water annular flow.In the actual operation of opening and closing valves,it is necessary to react quickly to reduce the reaction time of valves in small opening.