Abstract
The lifespan of journal bearings is directly related to the operating conditions they have to face and reducing their maintenance intervals allows one to have a clear idea about their performance when issues occur. The presence of scratches on one of its surfaces degrades the performance of a journal bearing. These effects have already been assessed in experiments; however, numerical studies on this subject are still scarce. This work develops a numerical thermohydrodynamic (THD) program using the finite volume method to simulate the effects of scratches on the performance of journal bearings. To test the validity of the program, the numerical results are compared with the scientific literature and with experimental measurements conducted using the Pprime Institute journal bearing test rig. Some minor discrepancies are observed, but the overall results are in good agreement.
Highlights
Hydrodynamic journal bearings are important machine elements and one of the most common types of hydrodynamic bearings, mainly used to support high-speed rotating machinery, including turbines and compressors, pumps and motors, etc., because of their very long lifetime, high load-carrying capacity, and efficiency
In 2016, Giraudeau et al [3] carried out experimental measurements of local parameters such as pressure and temperature, and global parameters such as friction torque and flow rate, for a two-lobe journal bearing with one scratch
The experiments were carried out using the journal bearing test rig at the Pprime Institute presented in [5]
Summary
Hydrodynamic journal bearings are important machine elements and one of the most common types of hydrodynamic bearings, mainly used to support high-speed rotating machinery, including turbines and compressors, pumps and motors, etc., because of their very long lifetime, high load-carrying capacity, and efficiency. They performed a parametric study, using a hydrodynamic numerical model with global thermal effects, to simulate scratched journal bearings They evaluated several scratch parameters (depth, extent, density, etc.) and concluded that the bearing performance is poorer in the presence of a scratch. In 2016, Giraudeau et al [3] carried out experimental measurements of local parameters such as pressure and temperature, and global parameters such as friction torque and flow rate, for a two-lobe journal bearing with one scratch They showed that the scratch depth influences pressure and temperature, and that the effects depend on the operating conditions (imposed load and speed). Where Tb is the bush temperature, rb is the bush radius coordinate, and θb is the bush angular coordinate
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