Eddy current heating for reducing transient thermal stresses in a rotor of a gas turbine engine

摘要

Transient thermal stresses in a gas turbine engine rotor (20) are reduced by generating eddy currents in an electrically conductive portion of the rotor (20). In one embodiment, magnets (42) are mounted on a ferrite support (44) inside a shaft (30) movable relative to the rotor (20). A sleeve (50) of copper or other very good electrical conductor may be mounted inside the central bore (32) of the rotor (20) to improve the generation of eddy currents.