流体机械

2008, v.36;No.438(12) 21-23+20

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磁液动密封的液-液界面稳定性分析
Analysis of Liquid-liquid Interface Stability for Magnetic Liquid Dynamic Seal

钱济国;杨志伊;
QIAN Ji-guo,YANG Zhi-yi(China University of Mining and Technology,Xuzhou 221116,China)

摘要(Abstract):

分别求出了磁液动密封中磁液和被密封液体的速度分布,特别是磁液作为非牛顿流体运动方程的解,并计算了两相液体界面的速度差。阐述了磁液密封液体的界面稳定性分析方法,并根据运动流体的Kelvin-Helmholtz界面稳定性分析模型求得磁液与被密封液体之间界面的稳定性判据及参数的临界值,讨论了影响磁液动密封的液-液界面稳定性的主要因素。两相液体界面稳定性分析的这一近似处理方法很好地说明了界面不稳定是导致磁液密封液体中磁液流失、密封失效的一个重要原因。
It was deduced respectively the speed distributions of both magnetic liquid and sealed liquid in magnetic liquid dynamic seal,especially the motion equation's solution of the magnetic liquid if it is considered a non-newtonian fluid,and computes the speed differences of two-phase liquid interface.It describes the method of interfacial stability analysis for sealing liquids by the magnetic liquid,and determines the stability criterion and critical parameter values of the interface between the magnetic liquid and the sealed liquid by the analytical model of kelvin-helmholtz stability of interface between moving liquids.Also it discusses the main factors of influencing the liquid-liquid interface stability in the magnetic liquid dynamic seal.The approximate method of the interface stability analysis makes a better explanation of which the interfacial instability is an important reason for resulting of magnetic liquid loss and seal failure in sealing liquids by the magnetic liquid.

关键词(KeyWords): 磁液动密封;速度差;液-液界面;稳定性判据
magnetic liquid dynamic seal;speed difference;liquid-liquid interface;stability criterion

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基金项目(Foundation):

作者(Authors): 钱济国;杨志伊;
QIAN Ji-guo,YANG Zhi-yi(China University of Mining and Technology,Xuzhou 221116,China)

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