机械密封腔流场内粒子对密封腔壁面及波纹管冲蚀分析  

Erosion Analysis on the Wall and Bellows of Mechanical Seal Cavity by the Particles in the Flow Field

作　　者：郭勇 穆塔里夫·阿赫迈德[1,2] GUO Yong;MUTELLIP Ahmat(School of Mechanical Engineering,Xinjiang University,Urumqi Xinjiang 830047,China;School of Electrical Engineering,Xinjiang University,Urumqi Xinjiang 830047,China)

机构地区：[1]新疆大学机械工程学院,新疆乌鲁木齐830047 [2]新疆大学电气工程学院,新疆乌鲁木齐830047

出　　处：《润滑与密封》2020年第3期82-87,共6页Lubrication Engineering

基　　金：国家自然科学基金项目(51565056).

摘　　要：为研究机械密封腔内混有固体颗粒的流体,在复杂工况下对密封腔壁面及波纹管表面冲蚀的影响,以CFD理论及方法,采用k-ε湍流模型和离散项DPM模型,对固液混合流场进行模拟分析,获得密封腔内流体中介质作用下密封腔壁面及波纹管外表面的压力场分布,分析不同工作状态下固体颗粒作用下密封腔内壁和波纹管外表面的冲蚀区域分布、固体颗粒在流场中的运动轨迹,以及机械密封工作过程中流场内固体颗粒的逃逸量、运动状态的变化。结果表明:粒子主要受颗粒阻力、浮重力、压力梯度力及波纹管和密封腔表面反作用力的影响;在旋转流场中,粒子作与旋转方向一致的螺旋方式前进;无转速时,冲蚀多发生在靠近入口处的波纹管外表面,旋转流场中,冲蚀多发生在密封腔靠后位置的壁面;随着转速增加,粒子逃逸率下降。研究结论为机械密封腔的设计布局及机械密封装置的优化提供理论依据。In order to study the influence of fluid mixed with solid particles in mechanical seal chamber on the erosion of sealing chamber wall and bellows under complex working conditions,based on CFD theory and method,k-εturbulence model and discrete DPM model were used to simulate the solid and liquid mixing flow field,and the pressure field distribution on the surface of the sealing cavity and the outer surface of the bellows was obtained.The erosion area distribution of the inner wall of the seal chamber and the outer surface of the bellows under the action of solid particles under different working conditions was studied,the trajectory of solid particles in the flow field and the change of the escape amount and movement state of solid particles in the flow field during mechanical seal operation were analyzed.The results show that the particles are mainly affected by particle resistance,floating gravity,pressure gradient force and surface reaction force of bellows and sealing chambers.In the rotating flow field,the particles move forward spirally in the same direction as the rotating direction.In the case of no rotating speed,the erosion mostly occurs on the outer surface of bellows near the entrance,and in the rotating flow field,the erosion mostly occurs on the wall near the back of the sealing chamber.The particle escape rate is decreased with the increasing of rotating speed.This research provides theoretical basis for the design and layout of mechanical seal cavity and the optimization of mechanical seal device.

关 键 词：机械密封 固液混合流场 DPM模型 逃逸量 冲蚀分析 

分 类 号：TB42[一般工业技术]