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Tuning thermal mismatch between turbine rotor parts with a thermal medium

United States Patent

February 20, 2001
View the Complete Patent at the US Patent & Trademark Office
In a turbine rotor, an aft shaft wheel and the final-stage wheel of the rotor are coupled together, including by a rabbeted joint. During shutdown and startup of the turbine, a thermal mismatch between the aft shaft wheel and final-stage wheel is avoided by respectively heating and cooling the aft shaft wheel to maintain the thermal mismatch within acceptable limits, thereby avoiding opening of the rabbeted joint and the potential for unbalancing the rotor and rotor vibration. The thermal medium may be supplied by piping in the aft bearing cavity into the cavity between the forward closure plate and the aft shaft wheel.
Schmidt; Mark Christopher (Niskayuna, NY)
General Electric Co. (Schenectady, NY)
09/ 218,230
December 22, 1998
This invention was made with Government support under Contract No. DE-FC21-95MC31176 awarded by the Department of Energy. The Government has certain rights in this invention.