连续注排式气体离心密封的性能分析

摘要

针对普通离心密封用于气体场合下存在的问题,提出一种带有连续注排密封液结构的新型离心密封,介绍该密封的工作原理及特点.基于VOF方法,利用Fluent软件对离心密封内的气液两相流进行数值模拟,求得密封液流量、气液交界面位置以及压力折减系数等密封特性参数,研究操作参数和结构参数对密封性能的影响.结果表明:该密封适用于高转速下的气体密封,在一定的密封间隙范围内,增加转轴转速会减少密封液的流量,而在密封液进口处设置环形积水槽会增加密封液的流量；增加密封液的注入压力,减小密封间隙有助于降低环形漩涡的影响.%Aimed at the problems of the common centrifugal seal for sealing gas, a configuration of the new-type centrif ugal seal device with continuous injection and elimination of the sealing fluid was proposed,and the operating principle and feature of the seal were introduced. The software Fluent was used for the numerical simulations of internal gas-liquid flow in the centrifugal seal,applying the Volume of Fluid(VOF) method. The mass flow rate of the sealing fluid,the air-liquid in terface and the reduced coefficient of pressure were gained. The influences of the operation parameters and structural pa rameters on the sealing property were studied. The investigation results show that the seal is suit for the condition of gas seal of high speed. Within certain ranges of the sealing gap,the flow rate of the sealing fluid is reduced with the raise of the rotor speed,and is increased when the annular water tank is set at the entrance of the sealing fluid. The influence of the an nular vortex can be reduced by increasing the injection pressure of the sealing fluid and decreasing the seal gap.