The turbine bearing oil film is how to set up?

The turbine bearing oil film is how to set up? 2020 - 11 - 29 bearing aperture is journal older, resting, journal is located in the lower bearing direct contact with the bearing inner surface, formed wedge gap between bearing and journal. When the rotor motion, there will be a direct friction between shaft and bush. But, as the rotation of shaft neck continuously to supply certain pressure bearing and viscosity of lubricating oil, adhesion on the journal of reservoir with shaft neck rotation, and driven in adjacent layers, into the shaft and bush formed between the upper and lower small wedge clearance, to the flow direction of rotation and bearing end. With the increase of rotational speed, is to increase the amount of oil, and the wedge area gradually decreases, and into which, because of the incompressibility of lubricating oil, lubricating oil were gathered in the narrow gap and produce oil pressure. With the increase of rotational speed, when the pressure enough to balance the rotor to the full force of bearing bush, the journal is the oil film is suspended in the oil film on turning, avoiding the metal directly friction, fluid friction is established. Rotor shaft neck runtime in the bearing shell, rotor interference by external force, the journal deviates from the equilibrium position, but also makes the rotor rotation center around the bearing inner hole center, the formation of vortex, whirling angular velocity is close to or equal to the rotor rotated around the center of their half of the rotating angular velocity, therefore is also called half speed vortex. When the rotor working speed is close to or equal to twice the first order critical speed of the rotor, the vortex motion speed is close to the critical speed, vortex is resonance amplifier, amplitude increases, this phenomenon is called oil film oscillation. To prevent and eliminate oil film oscillation method are: improve the rotor design, try to improve the first order critical speed of the rotor; Improve bearing type, bearing and shaft neck with radial clearance, than factors such as pressure, length-diameter ratio and oil viscosity, the instability of speed increase as far as possible. To prevent oil film oscillation effect best bearing is tilting tile bearing. （ Source: thermoelectric BBS)