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液环真空泵是广泛应用于石油、化工、冶金、矿山、电力、轻工等行业的基础设备。液环泵内的流动属于十分复杂的非稳态气液两相流动,目前还存在着能耗高、效率偏低等问题,而现有的理论分析无法准确描述液环真空泵内气液两相流动状况。本文运用FLUENT流动软件中的多相流欧拉分析方法结合滑移网格技术,模拟计算一单级单作用液环真空泵三维非稳态气液两相流动问题。计算区域包括液环泵进出气段、叶轮、进水管及泵体,滑移界面分别设置在液环泵的进、出气段与叶轮之间的交界面以及叶轮出口与泵壳间的交界面。模拟计算包括液环真空泵内气液两相流速、压力、两相分布等内容。计算结果表明:本文所采用的分析方法和手段,可以较好的模拟分析计算液环真空泵非稳态气液两相流动问题,对实现产品的优化设计,具有重要的工程指导作用。
Liquid ring vacuum pump is widely used in petroleum, chemical, metallurgy, mining, electricity, light industry and other infrastructure. The flow in the liquid ring pump belongs to a very complicated unsteady gas-liquid two-phase flow. At present, there are still some problems such as high energy consumption and low efficiency. However, the existing theoretical analysis can not accurately describe the gas-liquid two phase Flow conditions. In this paper, the multiphase flow Eulerian analysis method in FLUENT flow software is combined with the sliding mesh technique to simulate the three-dimensional unsteady gas-liquid two-phase flow in a single-stage single-acting liquid ring vacuum pump. The calculation area includes the inlet and outlet sections of the liquid ring pump, the impeller, the water inlet pipe and the pump body. The slip interfaces are respectively arranged at the interface between the inlet and outlet sections of the liquid ring pump and the impeller and the interface between the outlet of the impeller and the pump casing. Simulation includes the liquid-ring vacuum pump gas-liquid two-phase flow rate, pressure, two-phase distribution and so on. The calculation results show that the analytical methods and methods adopted in this paper can simulate and analyze the unsteady gas-liquid two-phase flow problem of liquid-ring vacuum pump, and have an important engineering guiding effect for the optimization design of the product.