基于CFD对启停阶段干气密封槽型控制与演变的数值仿真分析  

CFD-based Numerical Simulation of Groove Control and Evolution of Dry Gas Seal in Start-Stop Stage

作　　者：杨益服 李文磊 李俊杰 高德[2] 张炜[2] 陆俊杰 YANG Yi-fu;LI Wen-lei;LI Jun-jie;GAO De;ZHANG Wei;LU Jun-jie(Zhejiang Hope Machinery Co.,Ltd.;Zhejiang University Ningbo Institute of Technology)

机构地区：[1]浙江希望机械有限公司 [2]浙大宁波理工学院

出　　处：《化工机械》2022年第1期77-83,共7页Chemical Engineering & Machinery

基　　金：宁波市自然科学基金项目(202002N3082);国家自然科学基金项目(51905480);宁波“科技创新2025”重大专项(2020Z112,2018B10006)。

摘　　要：基于螺旋槽的结构,考虑低速下动压不足和静压较弱的现象,提出一种在普通螺旋槽的槽根部增设台阶周向贯通环槽新结构,简称阶梯形螺旋内环槽。基于密封系统和动静环的结构特点,建立了润滑气膜计算域模型,使用Gambit划分网格,随后采用Fluent软件数值模拟获得气膜压力分布和速度分布,提取开启力和泄漏量随转速和压力变化的数据进行分析,研究结果表明阶梯形螺旋内环槽性能好于普通螺旋槽,说明在低速低压的开启阶段,利用新型的阶梯形螺旋内环槽能保证动静环端面更快速打开,降低磨损,提高使用寿命。Through having the spiral groove structure based and the insufficient dynamic pressure and weak static pressure at low speed considered,a stepped circumferential ring groove was added to the general spiral groove’s root,which is called SIR-SG-DGS for short.Based on structural characteristics of the sealing system and the dynamic and static ring,the lubrication film’s calculation model was established,including having the grid divided by Gambit and the Fluent used to simulate film’s pressure distribution and velocity distribution so as to extract film’s opening force and leakage rate which changing with rotate speed and the pressure for analysis.The results show that,the performance of the stepped spiral inner ring groove outperforms that of the ordinary spiral groove,and at the low-speed and low-pressure opening stage,the new stepped spiral inner ring groove can ensure the opening of dynamic and static ring end face more quickly together with a reduced wear and increased service life.

关 键 词：干气密封 槽型 启停阶段 流场模拟 开启力 泄漏量 

分 类 号：TK474.813[动力工程及工程热物理—动力机械及工程]