초록 ▼

In a gas turbine engine control system having a first valve for regulating the flow rate of fuel in premixed combustion and a second valve for regulating that in diffusion combustion, when the combustion mode is switched from one mode to the other mode, whichever of the first and second valves is as

In a gas turbine engine control system having a first valve for regulating the flow rate of fuel in premixed combustion and a second valve for regulating that in diffusion combustion, when the combustion mode is switched from one mode to the other mode, whichever of the first and second valves is associated with the other combustion mew is opened to supply the amount of fuel required for conducting the other combustion mode and, the opening of the valve associated with the one combustion mode is gradually decreased, while that of the other combustion mode is gradually increased, thereby maintaining the total amount of fuel supplied to the engine constant, after elapse of a predetermined period. At the time of switching the combustion mode, therefore, the total amount of fuel supplied to the engine can be accurately controlled to a desired value to minimize engine speed fluctuation.

대표청구항 ▼

What is claimed is: 1. A system for controlling a gas turbine engine, comprising: a first valve regulating a flow rate of fuel used in premixed combustion; a second valve regulating the flow rate of fuel used in diffusion combustion; and a controller switching the combustion from one to other betwe

What is claimed is: 1. A system for controlling a gas turbine engine, comprising: a first valve regulating a flow rate of fuel used in premixed combustion; a second valve regulating the flow rate of fuel used in diffusion combustion; and a controller switching the combustion from one to other between the premixed combustion and the diffusion combustion and operating one of the first valve and the second valve associated with the other combustion to be switched so as to supply an amount of fuel required for conducting the other combustion to be switched; wherein the controller decreases the opening of the valve associated with the one combustion to be switched from, while increasing the opening of the valve associated with the other combustion to be switched to, to maintain a total amount of the fuel supplied to the engine constant, after elapse of a predetermined period since opening of the valve associated with the other combustion mode to be switched to. 2. The system according to claim 1, wherein the controller gradually decreases the opening of the valve associated with the one combustion to be switched to, while gradually increasing the opening of the valve associated with the other combustion to be switched from, thereby maintaining the total amount of the fuel supplied to the engine constant, after elapse of the predetermined period. 3. The system according to claim 1, wherein the controller determines to switch the combustion from one to other between the premixed combustion and the diffusion combustion based on at least an adiabatic flame temperature and a mixer inlet air temperature usable as an indicator of a flame failure limit of the premixed combustion. 4. The system according to claim 1, wherein the controller determines to switch the combustion from one to other between the premixed combustion and the diffusion combustion by comparing an adiabatic flame temperature with an adiabatic flame temperature threshold value. 5. The system according to claim 4, wherein the controller determines to switch the combustion from one to other between the premixed combustion and the diffusion combustion by comparing the adiabatic flame temperature with a first adiabatic flame temperature threshold value for the premixed combustion and a second adiabatic flame temperature threshold value for the diffusion combustion, and switches to the premixed combustion when the adiabatic flame temperature is equal to or greater than the first threshold value. 6. The system according to claim 5, wherein the controller continues the premixed combustion even if the adiabatic flame temperature should thereafter fall below the first threshold value, so long as the temperature is equal to or greater than the second threshold value. 7. The system according to claim 1, wherein the first valve is connected with a multiplex venture mixer whose flow rate characteristic is prepared as mapped data using actually measured data such that the mapped data is retrieved using values corrected with respect to a base pressure and temperature. 8. A method of controlling a gas turbine engine having a first valve regulating a flow rate of fuel used in premixed combustion and a second valve regulating the flow rate of fuel used in diffusion combustion, comprising the step of: controlling switching the combustion from one to other between the premixed combustion and the diffusion combustion and operating one of the first valve and the second valve associated with the other combustion to be switched so as to supply an amount of fuel required for conducting the other combustion to be switched; wherein the step of controlling decreases the opening of the valve associated with the one combustion to be switched from, while increasing the opening of the valve associated with the other combustion to be switched to, to maintain a total amount of the fuel supplied to the engine constant, after elapse of a predetermined period since opening of the valve associated with the other combustion mode to be switched to. 9. The method according to claim 8, wherein the step of controlling gradually decreases the opening of the valve associated with the one combustion to be switched to, while gradually increasing the opening of the valve associated with the other combustion to be switched from, thereby maintaining the total amount of the fuel supplied to the engine constant, after the elapse of the predetermined period. 10. The method according to claim 8, wherein the step of controlling determines to switch the combustion from one to other between the premixed combustion and the diffusion combustion based on at least an adiabatic flame temperature and a mixer inlet air temperature usable as an indicator of a flame failure limit of the premixed combustion. 11. The method according to claim 8, wherein the step of controlling determines to switch the combustion from one to other between the premixed combustion and the diffusion combustion by comparing an adiabatic flame temperature with an adiabatic flame temperature threshold value. 12. The method according to claim 11, wherein the step of controlling determines to switch the combustion from one to other between the premixed combustion and the diffusion combustion by comparing the adiabatic flame temperature with a first adiabatic flame temperature threshold value for the premixed combustion and a second adiabatic flame temperature threshold value for the diffusion combustion, and switches to the premixed combustion when the adiabatic flame temperature is equal to or greater than the first threshold value. 13. The method according to claim 12, wherein the step of controlling continues the premixed combustion even if the adiabatic flame temperature should thereafter fall below the first threshold value, so long as the temperature is equal to or greater than the second threshold value. 14. The method according to claim 8, wherein the first valve is connected with a multiplex venture mixer whose flow rate characteristic is prepared as mapped data using actually measured data such that the mapped data is retrieved using values corrected with respect to a base pressure and temperature.