Rolls-royce Corporation

Rolls-royce North American Technologies Inc.

Kenneth L Graham

John Joseph Costello

Robert C Dalley

Richard Joseph Skertic

A temperature drift compensation method includes pre-aging a thermocouple, during which the thermocouple is subjected to temperatures and/or pressures that cause or facilitate an oxidation growth on the conductor elements of the thermocouple. During the pre-aging, temperature readings of the thermocouple are recorded, and a model including a time-based exponential expression is derived from the temperature readings. In addition, a temperature sensor system includes a pre-aged thermocouple, and a temperature compensation circuit that modifies initial temperature readings from the pre-aged thermocouple according to a model including a time-based exponential expression.

Thermocouple pre-aging and temperature drift compensation

A gas turbine engine fuel additive control system includes a sensor positioned to sense an operational parameter of a gas turbine engine that includes a compressor section, a combustion section, and a turbine section. The system also includes a control valve positioned to supply a fuel additive to a fuel line. The fuel line contains fuel for supply to the combustion section of the gas turbine engine to which the fuel additive is selectively added by injection into the fuel line. The system also includes a controller configured to monitor the operational parameter in real time during operation of the gas turbine engine and adjust the control valve to dynamically modulate an amount of the fuel additive being supplied in the fuel in accordance with operation of the gas turbine engine.

Gas turbine engine fuel additive control system

An example engine control system may include an oxygen intake sensor; a fuel delivery device to control a rate of fuel delivery to the engine combustor; a combustor pressure sensor; a combustor temperature sensor; and a controller to receive at least one of an oxygen intake signal, a combustor pressure signal, and a combustor temperature signal; determine at least one of a reference specific fuel consumption (SFC) of the engine or a reference amount of a respective exhaust gas of a plurality of exhaust gases based on the oxygen signal, the pressure signal, and the temperature signal; compare at least one of the reference SFC or the reference amount of a respective exhaust gas to a respective threshold value; and control the fuel delivery device to control the rate of fuel delivery based on the comparison.

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Indianapolis, IN, United States of America

Kenneth L Graham