What is the definition of hydrostatic lubrication in gas turbine bearings?

Hydrostatic lubrication in gas turbine bearings refers to the application of pressurized fluid to create a separating film between two surfaces. In this lubrication method, oil or another lubricating fluid is introduced under pressure to form a film that keeps the bearing surfaces apart, reducing friction and wear. This is particularly important in gas turbine engines where high rotational speeds and loads are present, as it ensures that the bearing surfaces do not make direct contact, thus minimizing the potential for damage.

The pressurization of the fluid is critical; it allows the fluid film to withstand the loads imposed on the bearings, maintaining stability and reliability during operation. Hydrostatic lubrication is advantageous in situations where the dynamic pressures generated by moving parts may not be sufficient to maintain a lubricating film on their own, especially at low speeds or startup conditions.