入口长度对旋转直通式迷宫气封流场及流场力的影响  

Effects of Inlet Length on Flow Field and Fluid-induced Force of Rotary Straight-through Labyrinth Gas Seals

作　　者：王庆峰[1] 何立东[1] WANG Qingfeng;HE Lidong(College of Mechanical and Electrical Engineering,Beijing University of Chemical Technology,Beijing 100029,China)

机构地区：[1]北京化工大学机电工程学院,北京100029

出　　处：《润滑与密封》2018年第9期7-12,共6页Lubrication Engineering

基　　金：国家重点基础研究发展计划项目(973计划)(2012CB026006)

摘　　要：迷宫密封的转子和定子部件之间的流场和流场力直接影响转子的振动和稳定性。为了深入了解迷宫密封的流场和流场力特性,选取旋转直通式迷宫气封为研究对象,利用稳态CFD分析方法,研究密封入口长度对旋转直通式迷宫气封泄漏、流场和流场力的影响。考虑和不考虑入口预旋的影响,计算不同入口长度的旋转直通式迷宫气封的泄漏量、流场速度流线、总压强分布、流体压力和流体黏滞力。结果表明:随着入口长度的增大,密封流场泄漏量先增加后减小,转子表面流体压力和流体黏滞力先增加后快速减小;入口长度影响着直通式迷宫气封流场力,存在一个特定的入口长度,使转子表面的流体压力和流体黏滞力最大;当考虑入口预旋时,泄漏量、流体压力和流体黏滞力均有所减小。The flow field and fluid-induced force between the rotor and the stator of the labyrinth seal are directly affected the vibration and stability of the rotor.To understand the flow field and fluid-induced force characteristics of the labyrinth seal,the rotary straight-through labyrinth gas seal were selected as the research object,the effects of the inlet length on the leakage,flow field and fluid-induced force of the rotary straight-through labyrinth gas seal were investigated by using the steady-CFD analysis methods.The the leakage flow rates,velocity streamlines,total pressure distributions,pressure forces,and viscous forces of the labyrinth gas seal for different inlet lengths without and with pre-swirl were computed.The results show that with the increasing of inlet length,the leakage flow rates is firstly increased and then decreased,and the pressure forces and viscous forces are firstly increased and then decreased rapidly.The inlet length influences the flow field of the straight-through labyrinth gas seal,and there is a specific inlet length to maximize the pressure forces and viscous forces on the surface of the rotor.The pre-swirl results in the decrease of the leakage flow rates,the pressure forces and viscous forces.

关 键 词：旋转直通式迷宫气封 入口长度 泄漏 流场 流场力 

分 类 号：TH136[机械工程—机械制造及自动化] TK14[动力工程及工程热物理—热能工程]