The main bearing of a TBM is a large-scale, low-speed, heavy-load slewing bearing, which is crucial for effective lubrication and heat dissipation. In this paper, CFD simulations were conducted to analyze the oil-air two-phase flow under different oil supply rates, inner ring speeds, and oil immersion heights. The simulations were validated with a slewing bearing lubrication test bench. The results demonstrate that the main bearing exhibits a layered oil-air two-phase flow. When the oil supply rate is increased, the oil volume fraction in the main air phase rises, and the auxiliary thrust roll...
