AbstractGeometric and distribution effects of inclined dimples on the friction wear performance a textured surface were experimentally investigated. The frictional coefficients face temperatures four different kinds elliptical surfaces measured under various conditions rotation speed, load, viscosity. Experimental results showed that parameters significantly affected performance. From experiments it was found with double-row have smaller lower than single-row had 59% decrease in coefficient...

To improve lubrication effect and seal performance, complicated geometrical hydrodynamic grooves or patterns are often processed on end faces of liquid lubricated mechanical seals. These structures can lead to difficulties in precisely estimating the performance. In this study, an efficient adaptive finite element method (FEM) algorithm with mass conservation was presented, which a streamline upwind/Petrov-Galerkin (SUPG) weighted residual FEM fast iteration were applied solve equations...

For gas-liquid medium isolation seals in aero-engines, the upstream pumping function of directional grooves provides an effective way to realize design longer service life and lower leakage rate. However, this produces a new problem for mass transfer sealing clearance. This study establishes analytical model investigate behavior change rule opening force mechanical face with elliptical grooves. Compared traditional studies, considers not only but also cavitation effect. The results obtained...

In the present article, a gas thermal effect is modeled based on energy equipartition principle. Two new independent state equations for an ideal are developed that provide way to analyze effects in lubrication. Furthermore, equation derived lubrication and analysis of carried out spiral thrust bearing hydrostatic journal bearing. The results show temperature increases significantly lubricated region at high speed both bearings, positively influences load capacity expansion makes decrease...

The three dimension micro-scale flow field in spiral groove dry gas seals(S-DGS) is simulated by using CFD software based on lubrication theory this article. Effect of state the Seal performance analyzed under different film thickness. Laminar model and k-ε turbulent are used separately to obtain open force, leakage rate. results show that pressure distribution well agreement with reference. turbulence effect can enhance hydrodynamic hence enlarge while decrease rate seal.

A numerical modeling of thermoelastohydrodynamic gas spiral groove face seal behavior is presented. Temperature fields the fluid film and rings are computed, as they elastic thermal distortions rings. Numerical analysis carried out on a taking into account choked flow effect. Analysis results show that both induce strong influence geometry film, forming obvious divergent clearance which leads to significant decrease minimum equilibrium clearance, exceeding 50% in degree. Thermal distortion...

In order to obtain the leakage characteristics of an upstream pumping face seal with inclined ellipse dimples under high-temperature and high-speed liquid lubricating conditions, a thermo-hydrodynamic model is developed. The novelty this that it takes thermo-viscosity effect cavitation into account. influence operating parameters, such as rotational speed, clearance, pressure, ambient temperature structural dimple depth, inclination angle, slender ratio number on opening force rate,...

Vapor condensation in gas lubrication of high-pressure spiral-groove face seals is analyzed this article. A mathematical model vapor elastohydrodynamic (EHL) developed taking into account humidity and thermoelastic deformation seal rings. numerically predicted at high speed pressure. It found that usually occurs the sealing dam region, where state changes from to gas–liquid lubrication. The rate increases with an increase Under conditions, clearance has a significant influence on condensing...

Thermal distortion characteristics of spiral groove gas face seals are investigated for cases high temperature. The influence ambient temperature and difference on the thermal sealing performance is analyzed with consideration thermoviscosity effect. It found that, makes opening force decrease slightly increasing temperature, while effect causes leakage rate obviously. Temperature between inner outer diameters plays a more important role in seal face, which results sharp divergence...