Apparatus and process for rotor creep monitoring
First Claim
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1. A process for measuring rotor creep of an industrial gas turbine engine, the engine having a monolithic rotor, the process comprising the steps of:
- determine the rotor creep properties;
measure a radius of the rotor at a critical location;
based upon the rotor creep properties and the measured radius of the rotor, determine if a creep value of the rotor is within an acceptable limit;
if the creep value is within an acceptable limit, then continue to operate the engine and measure a radius of the rotor at the critical location; and
,if the creep value is not within an acceptable limit, then initiate an alarm or initiate engine shutdown.
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Abstract
An apparatus and a process for measuring rotor creep values for a monolithic rotor of an industrial gas turbine engine in order to determine when creep growth of the rotor has exceeded an allowable limit. One or more critical locations of the rotor are measured for real-time radius, and a CPU having rotor creep deflection model is used to compare the real-time data and determine if the rotor creep is within safe and allowable limits. If the creep is determined to exceed allowable values, then an alarm in initiated or engine shutdown occurs.
36 Citations
8 Claims
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1. A process for measuring rotor creep of an industrial gas turbine engine, the engine having a monolithic rotor, the process comprising the steps of:
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determine the rotor creep properties; measure a radius of the rotor at a critical location; based upon the rotor creep properties and the measured radius of the rotor, determine if a creep value of the rotor is within an acceptable limit; if the creep value is within an acceptable limit, then continue to operate the engine and measure a radius of the rotor at the critical location; and
,if the creep value is not within an acceptable limit, then initiate an alarm or initiate engine shutdown. - View Dependent Claims (2, 3, 4, 5)
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6. An industrial gas turbine engine comprising:
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a monolithic rotor with a compressor and a turbine rotatably connected to the rotor; a real-time rotor diameter measuring device secured to a casing of the engine so that a radius of a critical location of the rotor can be measured; a CPU having a creep deflection model for the rotor; the CPU being operatively connected to the real-time rotor diameter measuring device to collect the real-time measurements of the rotor radius at the critical location; and
,the CPU initiating an alarm or an engine shutdown when the rotor creep is determined to exceed an allowable limit. - View Dependent Claims (7, 8)
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Specification