利用VOF模型模拟水环真空泵的气液两相流

Simulation of Gas Liquid Two Phase Flow in Water Ring Vacuum Pump by VOF Model

水环真空泵的气液两相流动非常复杂,利用相关流体机械理论很难准确描述其流动规律,一定程度上增加了水环真空泵新产品的设计研发难度。本文结合2BEA-703型水环真空泵,建立了水环真空泵的三维瞬态Computational Fluid Dynamics模型。首先通过数值模拟分析了叶轮和泵腔内部的相态分布、压力分布以及固定截面的流线分布规律,然后对比分析了不同转速对水环真空泵内部流场的影响。根据仿真结果,准确地捕捉泵内气液分界面,揭示了气液两相流流动规律。研究结果用于新型水环真空泵的辅助设计制造,保证了产品的设计指标实现。

The gas-liquid two-phase flow of water ring vacuum pump is very complex,and it is difficult to accurately describe the flow law by using the relevant fluid mechanical theory analysis,which increases the difficulty of the design and development of new products of water ring vacuum pump to a certain extent. In this paper,a threedimensional transient computational fluid dynamics(CFD)model of 2 BEA-703 water ring vacuum pump is established. Firstly,through numerical simulation,the phase distribution,pressure distribution and streamline distribution of fixed section in impeller and pump cavity are analyzed,and then the influence of different speeds on the internal flow field of water ring vacuum pump is analyzed. According to the analysis of the simulation results,the gasliquid interface in the pump is accurately captured,and the flow law of gas-liquid two-phase flow is revealed. The research results are used in the aided design and manufacture of the new water ring vacuum pump to ensure the realization of the design index of the product.