STUDY OF THE INFLUENCE OF HEAT LOAD AND CAVITATIONS ON THE CARRY CAPACITY OF A TURBOCHARGER BEARING

Abstract

The aim of the study is to research the thermal and high-speed operating conditions for the tendency of the formation and distribution of fields of the volume fraction of vapor, pressure and temperature in the lubricating layer of a radial bearing. In this work, the numerical simulation of hydrodynamic processes in the lubricant layer of a real design of a radial bearing of a turbocharger. To solve the problem, authors used numerical methods of calculation: the method of finite differences and the method of finite dimensions. The novelty of the work lies in determining the parameters of the cavitation model for oil and carrying out calculations on a real design of a journal bearing, taking into account the experimental results of thermometry. As a result, studies were obtained of the dependence of the change in the bearing capacity and volumetric vapor in the lubricating layer depending on the thermal state and the rotor speed. An assessment of the influence of thermal and speed modes on the bearing capacity of a turbocharger rotor bearing is carried out. The results obtained indicate an increase in the volume fraction of vapor with the rotor speed. In this case, the thermal state of the bearing affects the shape of the vapor distribution and the value of the bearing capacity in the lubricating layer.