Effects of Relief Hole on the Static Characteristics of Externally Pressurized Steam-Lubricated Hybrid Journal-Thrust Bearing

In order to improve the static performance of externally pressurized steam hybrid journal-thrust bearing (EPSHJTB), this study proposes a novel relief hole structure. First, based on the classical bearing experimental data, the correctness of simulation method is verified. The detailed flow analysis of hybrid bearing is conducted using the computational fluid tool. Flow field variables are presented which include pressure, temperature and etc. Second, the relief hole structure is designed to reduce the radial and axial film outlet pressure. This study compares the static load capacity of EPSHJTB with and without relief holes. It’s found that the relief holes actually improve the load capacity of bearing. The numerical results also show that the position of relief holes influence the pressure distribution.