摘要
为研究回吸现象对泄漏率的影响,基于Fluent多相流空化模型,建立椭圆微孔端面机械密封间隙液膜的三维数值计算模型,并从原理上分析影响回吸现象的因素。结果表明:回吸越强,泄漏率越低,甚至是零泄漏;回吸现象的影响参数可以分为两类:影响动压效应的参数,如转速、内外径压差、空化压力;造成低压区与密封间隙出口截面间距离改变的参数,如方向角(椭圆长轴与水平轴逆时针夹角)、椭圆形状因子(椭圆长短轴比)。探讨各因素对椭圆微孔端面机械密封回吸现象的影响。结果表明,回吸的强弱与转速、椭圆形状因子正相关,与内外径压差、空化压力负相关,与方向角的关系类似正弦曲线。
A 3-D fluid numerical model of the mechanical seal with elliptical dimples was established based on multiphase flow cavitation model in Fluent to study the effect of suction on leakage rate.The influence parameters of the suction were analyzed theoretically.The results show that the leakage rate is reduced with the increase of suction,even to zero leakage rate.The influence parameters of the suction can be categorized into two types,the parameters which influence the hydrodynamic effect,such as velocity,differential pressure,cavitation pressure;the parameters which change the distance between the low-pressure zone and the outlet,such as orientation angle(the counterclockwise angle between the major axis of the ellipse and the horizontal axis),shape factor(length ratio of major to minor axis).The effect of these parameters on suction in mechanical seal with elliptical dimples was investigated.The results show that the suction is positively correlated with the velocity and shape factor,but negatively correlated with the differential pressure and cavitation pressure.The relationship between the suction and the orientation angle is similar to the sine function.
作者
王彦镐
吉华
张科
李岩霖
战琳月
WANG Yanhao;JI Hua;ZHANG Ke;LI Yanlin;ZHAN Linyue(School of Chemical Engineering,Sichuan University,Chengdu Sichuan 610065,China)
出处
《润滑与密封》
CAS
CSCD
北大核心
2018年第9期81-85,共5页
Lubrication Engineering
关键词
机械密封
椭圆微孔
泄漏率
回吸
参数研究
mechanic seal
elliptical dimples
leakage rate
outlet suction
parametric study
