Моделирование сегментного подшипника скольжения с учётом многофазности рабочего тела

Abstract

For starving tilting-pad journal bearings (TPJB) the real working fluid is a multiphase. Taking into account this feature significantly affects on a bearing hydrodynamic model accuracy and physicality, especially for starved conditions. Development of two-phase bearing model (oil + air) is performed in ANSYS CFX, taking into account the surface tension to simulate a free interface between fluid and gas. Has been performed an analysis of the pressure distribution of hydrodynamic forces on the bearing clearance. Results are showing an existence of specific pressure distribution ("smoothed maximum") for each pad. Thus the hypothesis of identical character of the pressure distribution for starved TPJB and oil bath TPJB is confirmed. At a shaft spin-up oil is drawn into a bearing clearance. Then oil extends on whole clearance for several revolutions of the shaft and forms a stable oil track, which abundantly lubricates surfaces of the shaft.