Numerical Simulation On Two-phase Flowing In Accompanied Test Bearing Chamber Of High-speed Railway Bearing Testing Rig

High-speed railway bearing testing rig project stems form the national hightechnology research and development program of China (863project).In order to realizethe high-speed railway bearing testing rig to work at high speed and heavy load, theperformance of studying and analyzing bearing lubrication system is urgent. Thenumerical simulation and analysis of gas-liquid two phases in accompanied test bearingchamber of high-speed railway bearing testing rig was presented. In order to providetheoretical guidance for the high-speed rail bearing, analyzing different workingconditions influencing on bearing chamber pressure, velocity and other parameters isvery meaningful.Firstly, the research and development of the high-speed rail bearing test rig andgas-liquid two-phase flowing of bearing cavity in the domestic and foreign wasanalyzed. According to the actual working conditions of the high-speed rail bearing testrig and operating characteristics.The reasonable and simplified bearing cavity wasfound by WORKBENCH software which was pre-processing software of fluidsimulation. Secondly, according to the actual condition, set boundary conditions. SelectVOF model and standard k-ε turbulence model and consider the wall surface adhesionmodel at the same time for numerical simulation. Establish conservation equation abouttwo-phase flow by the selection of rotation coordinate system. Then, analyze the wall’pressure and velocity of bearing chamber and point at distribution characteristics anddifferences along the circumferential distribution every20degrees by changing theinjection quantity, spindle’ speed and diameter of the outlet, which effected on averagepressure of the outlet and oil/gas volume ratio of the outlet were analyzed. Finally,select discrete phase/continuous phase coupling model for the numerical simulation oftwo-phase flow field of bearing cavity. By changing the condition’ parameters, study oilfilm thickness, oil film thickness velocity, airflow velocity flow influence on thedistribution of the bearing cavity and analyze its causes. The results of the analysis can be used to provide guidance on lubrication systemdesign of high-speed railway bearing test rig and afford the design and improvement ofthe bearing test rig with theory and data support.