What is the minimum number of bearings required for proper support of an engine rotor?

The minimum number of bearings required for proper support of an engine rotor is three. This is due to the need for stability and support along the rotor's length. The bearings provide both radial and axial support, ensuring that the rotor remains balanced and aligned during operation.

Using two bearings can lead to inadequate support, as the rotor might not be properly constrained, potentially causing excessive vibration and misalignment. With three bearings, one can be placed at each end of the rotor and one in the middle, creating a stable arrangement that helps to distribute the loads more evenly and minimizes the possibility of deformation or bending of the rotor under operational stresses.

Having three bearings also allows for better control of the rotor's axial position, which is critical in maintaining the efficiency and safety of the engine. This configuration not only supports the rotor effectively but also contributes to the overall reliability and longevity of the gas turbine engine.