Turbine with cooling or heating of rotor components during startup or shutdown

摘要

In a turbine rotor, a thermal mismatch between various component parts of the rotor occurs particularly during transient operations such as shutdown and startup. A thermal medium flows past and heats or cools one part (74) of the turbine which may have a deleterious thermal mismatch with another part (44). By passively controlling (72) the flow of cooling medium past the one part in response to relative movement of thermally responsive parts of the turbine, the flow of thermal medium along the flow path can be regulated to increase or reduce the flow, thereby to regulate the temperature of the one part to maintain the thermal mismatch within predetermined limits. <IMAGE>