Evitement de la dilatation thermique différentielle des éléments d'un rotor de turbine

Avoiding thermal mismatch between turbine rotor parts with a thermal medium

Verhinderung von unterschiedlicher Wärmedehnung bei Turbinenrotoren

Abstract

In a turbine rotor (10), an aft shaft wheel (42) and the final-stage wheel (18) of the rotor (10) are coupled together by a rabbeted joint (40). During shutdown and startup of the turbine, a thermal mismatch between the aft shaft wheel (16) and final-stage wheel (18) is avoided by respectively heating and cooling the aft shaft wheel (42) to maintain the thermal mismatch within acceptable limits, thereby avoiding opening of the rabbeted joint (40) and the potential for unbalancing the rotor (10) and rotor vibration. The thermal medium may be supplied by piping (70) in the aft bearing cavity (66) into the cavity (60) between the forward closure plate (62) and the aft shaft wheel (42).

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Patent Citations (4)

    Publication numberPublication dateAssigneeTitle
    US-4329114-AMay 11, 1982The United States Of America As Represented By The Administrator Of The National Aeronautics And Space AdministrationActive clearance control system for a turbomachine
    US-4596116-AJune 24, 1986Societe Nationale D'etude Et De Construction De Moteurs D'aviation "S.N.E.C.M.A."Sealing ring for a turbine rotor of a turbo machine and turbo machine installations provided with such rings
    US-4651532-AMarch 24, 1987Hitachi, Ltd.Method of warming up a reheat turbine
    US-4795307-AJanuary 03, 1989Mtu Motoren- Und Turbinen-Union Munchen GmbhMethod and apparatus for optimizing the vane clearance in a multi-stage axial flow compressor of a gas turbine

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