Importance

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Abstract

A turbomachine engine including an engine core including a high-pressure compressor, which has an exit stage having an exit stage diameter (D_CORE), a high-pressure turbine, and a combustion chamber in flow communication with the high-pressure compressor and the high-pressure turbine, a power turbine in flow communication with the high-pressure turbine, and a low-pressure shaft coupled to the power turbine and characterized by a midshaft rating (MSR) between two hundred (ft/sec)^1/2 and three hundred (ft/sec)^1/2. The low-pressure shaft has a redline speed between fifty and two hundred fifty feet per second (ft/sec). The turbomachine engine is configured to operate up to the redline speed without passing through a critical speed associated with a first-order bending mode of the low-pressure shaft. The low-pressure shaft has a length (L_MSR) defined by an engine core length (L_CORE) given by:

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First Claim