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在油水环状流管道运输过程中,球阀启闭时流道截面变化会对油水环状流稳定性产生较大影响。用VOF模型与CSF模型追踪油水界面,采取标准的k-ε湍流模型,建立数值模拟控制方程,分析球阀在不同开度及不同入流速度下油水环状流的流动状态,并建立了油水环状流试验平台进行验证。结果表明:数值模拟结果与试验结果一致,数值模拟能够很好地分析环状流在球阀内的流动;阀门开度对流型、油相体积分数、阀两端压力差、油相粘壁距离均产生影响,开度较小时,阀内与阀后出口管道的油水环状流遭到破坏,油相体积分数较小,阀两端压力差较大,油相容易粘附管壁;入流速度也对上述参数产生影响,较高的入流速度能够改善油水环状流的稳定性。
During the flow of oil-water annular flow pipe, the change of cross-section of the flow passage when the ball valve is opened and closed will greatly affect the stability of the oil-water annular flow. The VOF model and the CSF model were used to track the oil-water interface. The standard k-ε turbulence model was used to establish numerical control equations. The flow state of the oil-water annular flow at different opening degrees and different inflow velocities was analyzed. Flow test platform for verification. The results show that the numerical simulation results are consistent with the experimental results. The numerical simulation can well analyze the flow of annular flow in the ball valve. The valve opening convection type, the oil phase volume fraction, the pressure difference at both ends of the valve, When the opening degree is small, the annular flow of oil-water in the valve and the outlet pipe after the valve is damaged, the volume fraction of the oil phase is small, the pressure difference between the two ends of the valve is large, and the oil phase is easy to adhere to the wall of the pipe; On the above parameters have an impact, a higher inflow rate can improve the stability of oil-water annular flow.