Abstract
Mechanical face seals are crucial components of automotive cooling water pumps and affect the safe operation of the pump. This article focuses on the effect of friction instabilities on the wear of the seals. Friction instabilities, such as stick-slip, occur when the axle is decelerated or operated at a low speed. Based on previous studies, a simulation model is proposed of a mechanical face seal that considers the interaction of asperities of non-Gaussian surfaces and the heat transfer between the sealing rings. According to the Archard wear equation, a numerical wear simulation is performed, and the wear distance rate and wear time rate are obtained. A comparison of the contact pressure of the Gaussian and non-Gaussian surfaces indicates that the latter is more likely to generate high contact pressure, thereby producing more significant wear. The viscous shear heat and frictional heat due to asperity contact decrease with an increase in the thickness of the tapered film. As the shaft decelerates, the wear distance rate increases with an increase in the axial stiffness. The axial damping only affects the duration of the oscillations. The wear time rate decreases with an increase in the torsional stiffness and torsional damping. The results of this research provide guidelines for estimating the wear of mechanical seals when friction instabilities occur.
Highlights
Mechanical face seals are widely used for sealing rotating shafts
The contact between the stator and the rotor is the key in determining the performance of a mechanical seal [6]
The governing equation of the heat transfer in a mechanical face seal is [32]: flux generated in the contact area is computed from the contact friction torque and viscous friction torque of the asperities:
Summary
Mechanical face seals are widely used for sealing rotating shafts. The working principle of mechanical face seals is that a pair of end faces slide perpendicular to the axis and function under the action of fluid pressure and compensating forces. Analyzed seal lubrication and proposed by Valigi et al [4] does not consider the case of non-Gaussian surfaces, the effect of heat wear using experimental andfriction numerical methods and foundAyadi that surface roughness significant transfer, and the wear under instability conditions. Minet et al [18] developed a numerical flow model of mixed lubrication in mechanical face seals. In this paper, based on the two degrees of freedom dynamic model of Valigi et al [4], a numerical wear simulation method that considers asperity interaction (non-Gaussian surfaces), heat transfer, and macro-scale dynamic parameters is presented. The influences of the damping coefficient, torsional damping coefficient, axial stiffness, and torsional stiffness on the wear of the mechanical face seal under friction instability conditions are analyzed. 2. Mathematical Model of Mechanical Face Seals under Friction Instability Conditions.
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