What is a common consequence of operating a gas turbine at high RPM for extended periods?

Operating a gas turbine at high RPM for extended periods can lead to potential seizure of the rotor. This occurs due to the mechanical stresses that accumulate on the turbine components at elevated rotational speeds. Over time, these stresses can exceed the material limits, leading to distortions, misalignments, or even failure mechanisms such as overheating and material fatigue.

When a gas turbine runs at high RPM, the centrifugal forces acting on the rotor and its components increase significantly. If the operating conditions cause excessive heat build-up without proper cooling or if lubrication fails, the rotor can expand beyond its design tolerances, potentially resulting in the rotor seizing within its bearings or housing. This is a critical condition that can disable the engine and require extensive repairs.

Conversely, options discussing increased fuel efficiency and improved thrust performance might occur under optimal operating conditions; however, these benefits are balanced against the risks associated with prolonged high RPM. Decreased engine wear is typically not a result of such operation; instead, wear and tear generally increase under stress conditions. Thus, the consequence of potential rotor seizure highlights the importance of adhering to recommended operational limits to maintain engine integrity and longevity.