Gas turbine swirl detection
AssigneeElectric Power Research Institute, Inc.
InventorsLeonard Charles Angello, Benjamin Emerson, Timothy Charles Lieuwen, David Robert Noble
Life of this patent
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Abstract
A non-transitory computer readable medium with instructions stored thereon, the instructions executable by one or more processors for calculating base swirl in a gas turbine; and calculating relative swirl in the gas turbine. Also, a method for gas turbine maintenance, comprising identifying a combustor in need of repair or replacement within a gas turbine; and repairing or replacing the combustor; wherein said identifying comprises calculating base swirl of the gas turbine and calculating relative swirl of the gas turbine in order to associate a gas path from a thermocouple to the combustor in need of repair or replacement.
Claims26
A non-transitory computer readable medium with instructions stored thereon,
- wherein the non-transitory computer readable medium is coupled to one or more processors;
- wherein the instructions are executable by the one or more processors configured to perform calculating base swirl and relative swirl in a gas turbine;
- wherein calculating the relative swirl comprises calculating the difference between the base swirl and a reference swirl retrieved from a reference database;
- and
- wherein calculating the base swirl comprises determining an average angular offset between an unsteady pressure amplitude as a function of an angular position within the gas turbine and a mean-subtracted exhaust temperature as a function of angular position within the gas turbine, wherein the average angular offset is a function of a gas turbine load.
A non-transitory computer readable medium with instructions stored thereon,
- wherein the non-transitory computer readable medium is coupled to one or more processors;
- wherein the instructions are executable by the one or more processors configured to perform calculating base swirl and relative swirl in a gas turbine;
- wherein calculating the relative swirl comprises calculating the difference between the base swirl and a reference swirl retrieved from a reference database;
- and
- wherein calculating the base swirl comprises measuring a pressure amplitude within the gas turbine and fitting the pressure amplitude to the expression A *e{circumflex over (()}i*Θd), wherein A is a constant coefficient, i is the square root of negative one, e is Euler's number, and Θd is the angular phase of the measured pressure amplitude.
A non-transitory computer readable medium with instructions stored thereon,
- wherein the non-transitory computer readable medium is coupled to one or more processors;
- wherein the instructions are executable by the one or more processors configured to perform calculating base swirl and relative swirl in a gas turbine;
- wherein calculating the relative swirl comprises calculating the difference between the base swirl and a reference swirl retrieved from a reference database;
- and
- wherein calculating the base swirl comprises measuring a mean-subtracted gas path temperature within the gas turbine and fitting the mean-subtracted gas path temperature to the expression B *e{circumflex over ( )}(i*Θt), wherein B is a constant coefficient, i is the square root of negative one, e is Euler's number, and Θt is the angular phase of the measured mean-subtracted gas path temperature.
A method for gas turbine maintenance, comprising:
- identifying a combustor in need of repair or replacement within a gas turbine;
- and
- repairing or replacing the combustor;
- wherein said identifying comprises calculating base swirl of the gas turbine and calculating relative swirl of the gas turbine in order to identify a gas path from a thermocouple to the combustor in need of repair or replacement, and wherein calculating relative swirl comprises calculating the difference between the base swirl and a reference swirl retrieved from a reference database as a function of gas turbine load.
Dependencies are inferred from the claim text.