摘要
以高温动压型机械密封为研究对象,基于Eulerian多相流模型和蒸发冷凝模型,建立涉及高温汽化、固体颗粒、黏温效应及牛顿流体内摩擦效应的动压型机械密封润滑膜汽液固三相流动模型,模拟研究槽深、槽宽比、螺旋角及槽径比对润滑膜汽化、固体颗粒分布规律及密封性能的影响关系。研究表明:润滑膜固体颗粒体积分数随槽深、槽径比的增大而增大,且在槽宽比为0.5时出现最大值,而固体颗粒体积分数随螺旋角的变化规律与转速有关;润滑膜平均汽相体积分数随槽深的增大而减小,随螺旋角的增大而增大,槽宽比为0.7时平均汽相体积分数出现最大值,槽径比在0.3以上时平均汽相体积分数随槽径比的增大而增大;槽深8μm时润滑膜汽相、固体颗粒相出现突变,槽深低于8μm时处于气相较高、固体颗粒相较小状态,槽深高于8μm时则相反;基于汽液固流动的密封性能分析表明,选用9μm左右的槽深、0.6左右的槽径比、16°~20°的螺旋角、0.3~0.4的槽宽比时对密封性能有利,采用8μm以上的槽深及小于0.5的槽宽比时,转速较高时选用较小槽径比、转速较低时选用较大槽径比时有利于抑制汽化。
Based on Eulerian multiphase flow model and evaporation condensation model,the vapor-liquid-solid three-phase flow model involving high-temperature vaporization,solid particles,viscosity-temperature effect and Newtonian internal friction effect for high temperature dynamic pressure mechanical seals was established.The effects of groove depth,groove width ratio,helix angle and groove diameter ratio on the vaporization of lubricating film,the distribution of solid particles and the sealing performance were studied.The results show that the volume fraction of solid particles of the lubricating film increases with the increase of groove depth and groove diameter ratio,and reaches the maximum value at a groove width ratio of 0.5.While the variation solid particle volume fraction with the helix angle is related to the rotational speed.The average vapor phase volume fraction of the lubricating film decreases with the increase of groove depth and increases with the increase of helix angle.When the groove width ratio is 0.7,the average vapor phase volume fraction reaches the maximum value,and when the groove diameter ratio is above 0.3,the average vapor phase volume fraction increases with the increase of groove diameter ratio.When the groove depth is 8 μm,there is a sudden change in the vapor phase and solid particle phase of the lubricating film,and the groove depth is less than 8 μm,it is in a state of higher gas phase and smaller solid particle phase,but the opposite is true when the groove depth is higher than 8 μm.The sealing performance analysis based on vapor-liquid solid flow shows that the it is beneficial to the sealing performance when selecting a groove depth of about 9 μm,a groove diameter ratio of about 0.6,a helix angle from 16°to 20°,and a groove width ratio from 0.3 to 0.4.When using a groove depth of over 8 μm and a groove width ratio of less than 0.5,it is beneficial for suppressing vaporization by selecting a smaller groove diameter ratio at higher speeds and a larger groove diameter ratio at l
作者
陈汇龙
史迪超
侯婉
程谦
陈英健
卫泽鹏
刘瑞睿
CHEN Huilong;SHI Dichao;HOU Wan;CHENG Qian;CHEN Yingjian;WEI Zepeng;LIU Ruirui(College of Energy and Power Engineering,Jiangsu University,Zhenjiang Jiangsu 212013,China;Anhui Jianghuai Automobile Group Co.,Ltd.,Jianghuai Anhui 305870,China)
出处
《润滑与密封》
CAS
CSCD
北大核心
2023年第9期13-24,共12页
Lubrication Engineering
基金
国家自然科学基金项目(51976078)。
关键词
高温机械密封
汽液固流动
槽型参数
汽化
固体颗粒
密封性能
high temperature mechanical seal
vapor-liquid-solid flow
slot parameters
vaporization
solid particles
sealing performance
