摘要
上游泵送机械密封运行中常因固体颗粒沉积而出现动压槽堵塞失效现象,为了对微间隙润滑膜固体颗粒沉积特性进行研究,建立了密封润滑膜三维几何模型和气液固多相流计算模型,应用Mixture模型和DPM模型模拟研究了不同颗粒直径、转速、介质压力、颗粒进口体积分数和润滑膜厚度对固体颗粒沉积特性的影响规律。研究表明:来自润滑膜内径侧固体颗粒的沉积率及沉积区域均与颗粒直径、颗粒进口体积分数、密封工况和润滑膜厚度等参数有关,粒径较小、转速增大、介质压力增大和膜厚减小有利于降低颗粒沉积率;螺旋槽低压区是颗粒沉积的主要部位,且粒径、颗粒进口体积分数、转速和膜厚增大,介质压力降低,使沉积区域明显向外槽根拓展,这是螺旋槽易出现堵塞失效的原因;低转速时易在坝区出现颗粒沉积,非槽区的沉积颗粒呈周向分布。
During the operation of upstream pumping mechanical seal,the dynamic pressure groove blockage often occurs due to the deposition of solid particles.To study the solid particle deposition characteristics of the micro-gap lubricant film,a three-dimensional geometric model of the seal lubricant film and a gas-liquid-solid multi-phase flow calculation model were established.The Mixture model and DPM model were applied to study the different particle diameter,rotational speed,medium pressure,particle import volume fraction and the lubrication film thickness on the influence of solid particle deposition characteristics.The results show that the deposition rate and deposition area of solid particles from the inner diameter side of the lubrication film are related to the particle diameter,particle import volume fraction,sealing condition and lubrication film thickness.Smaller particle size,larger rotating speed,larger medium pressure and smaller film thickness are beneficial to lower particle deposition rate.The low-pressure area of spiral groove is the main part of particle deposition.With the increase of particle diameter,particle import volume fraction,rotating speed and film thickness,medium pressure decreases and the deposition area obviously extends outward to the root of the groove,which is the reason why the spiral groove is prone to blockage and failure.Particle deposition is easy to occur in dam area and particles in the non-slot area are circumferentially distributed at low rotating speed.
作者
陈汇龙
桂铠
韩婷
谢晓凤
陆俊成
赵斌娟
CHEN Huilong;GUI Kai;HAN Ting;XIE Xiaofeng;LU Juncheng;ZHAO Binjuan(School of Engery and Power Engineering,Jiangsu University,Zhenjiang 212013,Jiangsu,China)
出处
《化工学报》
EI
CAS
CSCD
北大核心
2020年第4期1712-1722,共11页
CIESC Journal
基金
国家自然科学基金项目(51976078)。
关键词
上游泵送机械密封
润滑膜
固体颗粒
沉积特性
流体力学
多相流
数值模拟
upstream pumping mechanical seal
lubricating film
solid particles
deposition characteristics
fluid mechanics
multiphase flow
numerical simulation
作者简介
通信作者:桂铠(1995-),男,硕士研究生,603339928@qq.com;第一作者:陈汇龙(1961-),男,博士,教授,huji@ujs.edu.cn。
