Experimental Investigation on the Inlet Pressure Build-Up at the Entrance of a Large Tilting Pad Journal Bearing

대형 틸팅패드 저어널베어링의 패드 입구에서 발생하는 선단압력에 관한 실험적 연구

The experimental investigation on the inlet pressure of a large tilting pad journal bearing is studied. The continuous distribution of the film pressure and film thickness are measured along with the shaft speed and bearing load for various flow rates. Considerably large inlet pressure is observed at the entrance of each pad, especially lower pads. The inlet pressure increases with the increase of shaft speed as well as bearing load, but it is almost independent on the folw rate and the oil supply temperature. Because of the inlet pressure, the upper pads always keep up slight wedge film shape which are almost parallel to the journal surface, and spragging is not observed in the upper pads with no preload.