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    • 6. 发明申请
    • EDDY CURRENT HEATING FOR REDUCING TRANSIENT THERMAL STRESSES IN A ROTOR OF A GAS TURBINE ENGINE
    • 用于减少气体涡轮发动机转子中瞬态热应力的EDDY电流加热
    • WO2006096966A1
    • 2006-09-21
    • PCT/CA2006/000365
    • 2006-03-10
    • PRATT & WHITNEY CANADA CORP.DOOLEY, Kevin, AllanABRARI, Farid
    • DOOLEY, Kevin, AllanABRARI, Farid
    • F01D5/08F01D25/10
    • F01D5/34F05D2230/90F05D2300/507
    • Transient thermal stresses occur in a gas turbine rotor (20) at start-up as a rotor central section (22) does not heat up as quickly as outer rotor sections. Such stresses are mitigated when the central section is heated using a device (40) capable of induction heating. The device (40) comprises an electrical conductor (50,52) provided at the surface of a rotor central bore (32) and at least one magnetic field producing element (42) adjacent to the conductor. The electrical conductor comprises an inner sleeve (50) preferably made of copper, and an outer sleeve (52) preferably made of steel. The magnetic field producing elements are either permanent magnets or electromagnets that are mounted around a tubular support structure (44) which is preferably set inside an inner shaft (30). Relative rotation between the inner shaft (30) and the rotor (20) results in eddy currents in the electrical conductor (50, 52) thereby causing heating of the rotor central section (22). An associated method of reducing transient thermal stresses in a gas turbine engine rotor is also disclosed.
    • 由于转子中心部分(22)不像外转子部分一样加热,所以瞬间热应力在起动时在燃气涡轮转子(20)中发生。 当使用能够感应加热的装置(40)加热中心部分时,可以减轻这种应力。 设备(40)包括设置在转子中心孔(32)的表面处的电导体(50,52)和邻近导体的至少一个磁场产生元件(42)。 电导体包括优选由铜制成的内套筒(50)和优选由钢制成的外套筒(52)。 磁场产生元件是安装在优选地设置在内轴(30)内的管状支撑结构(44)周围的永磁体或电磁体。 内轴(30)和转子(20)之间的相对旋转导致电导体(50,52)中的涡流,从而导致转子中心部分(22)的加热。 还公开了一种减少燃气涡轮发动机转子中的瞬态热应力的相关方法。