Determination of a signal indicative of shaft power

摘要

A gas turbine engine provides mechanical shaft power. Two parameters relating to engine operation are sensed that are representative of two different pressures, two different temperatures, or a pressure and a temperature associated with the engine. A value representative of the shaft power is determined during engine operation as a function of these two parameters. This value may be used for engine monitoring including making one or more adjustments to operational aspects of the engine, regulating/controlling engine function, and/or providing one or more power indicators.

主权项

1. A method, comprising:
providing a gas turbine engine structured to rotate a shaft to generate mechanical power; sensing a gas pressure of a working gas within the gas turbine engine during gas turbine engine operation; determining a signal representative of a computed estimate of mechanical power provided by rotation of the shaft, the computed estimate formulated as a function of the gas pressure and a temperature, the temperature within the computed estimate used to compensate for gas turbine engine variation over time in the function; and controlling the gas turbine engine operation in accordance with the signal; wherein the function comprises the relationship (T20/Tref)A*(P30/Pamb), wherein T20 represents a detected inlet temperature of a compressor of the gas turbine engine or an ambient temperature detected proximate the gas turbine engine or within a plenum of the gas turbine engine; Tref represents a reference ambient temperature; “A” represents an experimentally derived value corresponding to the gas turbine engine; P30 represents the gas pressure detected at a discharge of a compressor of the gas turbine engine or at an entry of a combustor of the gas turbine engine; and Pamb represents an ambient air pressure detected proximate the gas turbine engine or within a plenum of the gas turbine engine.