Abstract
A four-pad journal bearing is used to support high-speed, high-load turbine generators. The direct lubrication type has the merits of low power loss, low pad temperature, and high load capacity. Direct lubrication offers the additional advantages of good vibration and anti-shock characteristics. The simulation of bearings of this type requires two-phase fluid analysis because the fluid consists of a mixture of oil and air. Apart from this, because of the movement of the rotor and tilting pad, two-phase two-fluid structure interaction (2-FSI) simulation is required to determine the final locations of the rotor and pads. Finally, based on these locations, a static simulation is conducted to determine the temperature, pressure, and the oil and air distribution. The rotor moves 0.5 mm in the direction of negative gravity and the tilting pad rotates 0.09, 0.035 degrees with a minimum gap of 78 mm and maximum pressure of 10 MPa.
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