Research on the temperature rise characteristics of bearings under high-temperature oil cut-off conditions
Yunfeng Li, Xiaoxue Xue, Mingliang Yang, Chuang Liu, Guochuang WuPurpose
The purpose of this paper is to explore the characteristics of temperature field changes in the bearing cavity of an aero-engine bearing under high-temperature conditions caused by insufficient lubrication and wear of the sealing device.
Design/methodology/approach
This paper constructs a fluid–solid–thermal coupling model by combining the Palmgren heat generation formula, computational fluid dynamics and heat transfer theory, sets up a high-temperature gas-blowing test environment and explores the temperature field variation law of high-speed light-load double half inner ring angular contact ball bearings within 30 s of oil cut-off via the method combining theory-multi-physics field coupling simulation and high-temperature oil cut-off test.
Findings
Research shows that when the bearing is oil cut-off, the volume fraction of internal lubricating oil drops rapidly, the oil film breaks, increasing friction and the outer ring temperature rises by 22.2°C. In the 30 s oil cut-off test, the outer ring temperature rose by 24.8°C; within 5 s after oil supply recovery, residual lubricating oil exhaustion worsens the friction environment. During the brief delay, the lubricating oil temperature also rises briefly then falls.
Originality/value
This paper establishes a numerical model of high-temperature gas flow and thermal environment under the condition of seal failure. And it conducts the first systematic study on the temperature rise characteristics of bearings under the coupled conditions of high-temperature gas intrusion and oil cut-off. The simulation and the experimental verification show that the temperature variation trend is consistent, confirming that the theory-multi-physics field coupling simulation method can effectively simulate the temperature rise characteristics during the oil cut-off process of the bearing.