Research On Static Characteristics Of Hybrid Bearing Under Laminar And Turbulence Mixed Patterns

Hybrid journal bearing with deep-shallow chambers reach the maximum film thickness difference in the place of chambers and oil-seal edges. Therefore, turbulence, laminar and even mixing flow exist in the same bearing chamber. This paper takes this kind of bearing as a research object, builds the mathematical model of the oil in mixing pattern and calculates the main static characteristics in different flows using the Finite Element Method.Firstly, the merits and defects of several common lubrication patterns are discussed, the oil Reynolds equation and its boundary condition in the mixing flow containing laminar and turbulence at the same time are established, the oil-film is analyzed by the Finite Element Method, the program is compiled. Secondly, the effects on the static characteristics under different rotating speeds, feeding pressures and the eccentricities in the mixing pattern are discussed.Calculations indicate that in the same operational parameters except oil flow rate the main static characteristics come to a maximum in turbulence and have some decrease in mixing pattern and reach the minimum in laminar condition. The effects on the oil flow are more complicated, in the place of large eccentricities the laminar calculations is larger than it in turbulent condition. Furthermore, the difference of critical Reynolds number has lager influence on the main static characteristics under mixing pattern. As for a hybrid journal bearing the accurate determination of the critical Reynolds number is a main problem being researched in the future.