US3719047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control devices for gas turbine power plants
Assignee: Safran Aircraft Engines SAS
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Filing: 1971-02-03
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Granted: 1973-03-06
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Expires: 1991-02-03
Abstract
Abstract A control device for a gas turbine power plant of the type comprising a compressor, a combustion chamber supplied with air coming from the compressor and with fuel, a turbine supplied with combustion gases coming from the combustion chamber, and a nozzle which discharges the combustion gases coming from the turbine, said control device comprising means for metering the fuel flow to the combustion chamber and means for varying the crosssectional area of the nozzle, wherein the means for varying the cross-sectional area of the nozzle is controlled as a function of the fuel flow rate C delivered to the combustion chamber, the static air pressure P2 at exit from the compressor, and the static gas pressure Ps at the turbine exit, so that at least under certain conditions of operation, an output quantity defined by the expression c/( Beta Ps - Ps ), in which Beta designates a constant coefficient of reduction, has a desired predetermined value.
Inventors
- 👤 J Briotet
- 👤 A Ravagli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:21
CPC Classifications
F; F02; F02K; F02K1/00; F02K1/06; F02K1/15; F02K1/16; F02K1/17
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
151 words
In and for a gas turbine power plant which comprises a compressor, a combustion chamber supplied with air coming from the compressor and with fuel, a turbine supplied with combustion gases coming from the combustion chamber, and a nozzle for discharging the combustion gases coming from the turbine, an improved device comprising: means for regulating the fuel flow to the combustion chamber; means for varying the cross-sectional area of the nozzle; and means for controlling the nozzle cross-sectional area varying means as a function of the fuel flow rate C delivered to the combustion chamber, the static air pressure Ps at exit from the compressor, and the static gas pressure Ps at the turbine exit, so that at least under certain conditions of operation, an output quantity defined by the expression C/( Beta Ps - Ps ), in which Beta designates a constant coefficient of reduction, has a desired predetermined value.
Claim 2
Dependent Claim
151 words
In and for a gas turbine power plant which comprises a compressor, a combustion chamber supplied with air coming from the compressor and with fuel, a turbine supplied with combustion gases coming from the combustion chamber, and a nozzle for discharging the combustion gases coming from the turbine, an improved device comprising: means for regulating the fuel flow to the combustion chamber; means for varying the cross-sectional area of the nozzle; and means for controlling the nozzle cross-sectional area varying means as a function of the fuel flow rate C delivered to the combustion chamber, the static air pressure Ps at exit from the compressor, and the static gas pressure Ps at the turbine exit, so that at least under certain conditions of operation, an output quantity defined by the expression C/( Beta Ps - Ps ), in which Beta designates a constant coefficient of reduction, has a desired predetermined value.
Claim 3
Dependent Claim
151 words
In and for a gas turbine power plant which comprises a compressor, a combustion chamber supplied with air coming from the compressor and with fuel, a turbine supplied with combustion gases coming from the combustion chamber, and a nozzle for discharging the combustion gases coming from the turbine, an improved device comprising: means for regulating the fuel flow to the combustion chamber; means for varying the cross-sectional area of the nozzle; and means for controlling the nozzle cross-sectional area varying means as a function of the fuel flow rate C delivered to the combustion chamber, the static air pressure Ps at exit from the compressor, and the static gas pressure Ps at the turbine exit, so that at least under certain conditions of operation, an output quantity defined by the expression C/( Beta Ps - Ps ), in which Beta designates a constant coefficient of reduction, has a desired predetermined value.
Claim 4
Dependent Claim
151 words
In and for a gas turbine power plant which comprises a compressor, a combustion chamber supplied with air coming from the compressor and with fuel, a turbine supplied with combustion gases coming from the combustion chamber, and a nozzle for discharging the combustion gases coming from the turbine, an improved device comprising: means for regulating the fuel flow to the combustion chamber; means for varying the cross-sectional area of the nozzle; and means for controlling the nozzle cross-sectional area varying means as a function of the fuel flow rate C delivered to the combustion chamber, the static air pressure Ps at exit from the compressor, and the static gas pressure Ps at the turbine exit, so that at least under certain conditions of operation, an output quantity defined by the expression C/( Beta Ps - Ps ), in which Beta designates a constant coefficient of reduction, has a desired predetermined value.
Claim 5
Dependent Claim
148 words
A control device as claimed in claim 1, comprising means for producing as a function of the fuel flow rate C delivered to the combustion chamber, of the static pressure Ps of the air at the exit from the compressor and of the static pressure Ps of the gases at the exit from the turbine, a first signal which is a function of the output quantity (C/( Beta Ps - Ps )) ; means for producing a second signal or reference signal (C/( Beta Ps - Ps )) which is a function of said desired predetermined value ; means for producing a third signal or error signal which is a function of the difference (C/( Beta Ps - Ps )) - (C/( Beta Ps - Ps )) ; and means sensitive to said error signal in order to control the variation in the cross-sectional area of the nozzle.
Claim 6
Dependent Claim
87 words
A control device as claimed in claim 2, wherein the means for generating the signal which is a function of the quantity (C/( Beta Ps - Ps )) comprises a force balance system with a variable multiplication ratio, which is subjected to a first force as a function of the fuel flow rate C and to a second force as a function of the pressure difference ( Beta Ps - Ps ) ; and means for generating a signal which is a function of said multiplication ratio.
Claim 7
Dependent Claim
30 words
A control device as claimed in claim 2, also including a pilot-operable control lever, and wherein the reference signal generating means comprises means sensitive to the position of said lever.
Claim 8
Dependent Claim
40 words
A control device as claimed in claim 4, wherein said reference signal generating means also includes means sensitive to at least one other parameter of the power plant, in particular the total temperature of the air at the compressor intake.
Claim 9
Dependent Claim
62 words
A control device as claimed in claim 3, wherein the means sensitive to the error signal and designed to control the variation in the cross-sectional area of the nozzle, comprises means which are sensitive to the instantaneous position of said force balance system and means for modifying, as a function of said error signal, the multiplication ratio of said force balance system.
Claim 10
Dependent Claim
168 words
A control device for a gas turbine power plant of the type comprising a compressor, a combustion chamber supplied with air coming from the compressor and with fuel, a turbine supplied with combustion gases coming from the combustion chamber, and a nozzle for discharging the combustion gases coming from the turbine, said device cOmprising: means for regulating the fuel flow to the combustion chamber; means for varying the cross-sectional area of the nozzle; means for controlling the nozzle cross-sectional area varying means as a function of the fuel flow rate C delivered to the combustion chamber, the static air pressure Ps at exit from the compressor, and the static gas pressure Ps at the turbine exit, so that at least under certain conditions of operation, an output quantity defined by the expression C/( Beta Ps - Ps ), in which Beta designates a constant coefficient of reduction, has a desired predetermined value; and a manual control system operable in an emergency for controlling the fuel flow regulating means.
Claim 11
Dependent Claim
168 words
A control device for a gas turbine power plant of the type comprising a compressor, a combustion chamber supplied with air coming from the compressor and with fuel, a turbine supplied with combustion gases coming from the combustion chamber, and a nozzle for discharging the combustion gases coming from the turbine, said device cOmprising: means for regulating the fuel flow to the combustion chamber; means for varying the cross-sectional area of the nozzle; means for controlling the nozzle cross-sectional area varying means as a function of the fuel flow rate C delivered to the combustion chamber, the static air pressure Ps at exit from the compressor, and the static gas pressure Ps at the turbine exit, so that at least under certain conditions of operation, an output quantity defined by the expression C/( Beta Ps - Ps ), in which Beta designates a constant coefficient of reduction, has a desired predetermined value; and a manual control system operable in an emergency for controlling the fuel flow regulating means.
Claim 12
Dependent Claim
171 words
A control device for a gas turbine power plant of the type comprising a compressor, a combustion chamber supplied with air coming from said compressor and with fuel, a turbine supplied with combustion gases coming from the combustion chamber, and a nozzle for discharging the combustion gases coming from said turbine, said control device comprising, in combination: means for regulating the rate of fuel flow to the combustion chamber; means operable to vary the cross-sectional area of the nozzle between maximum and minimum limits; an automatic control system for operating said nozzle cross-sectional area varying means; a normally inoperative manual control system for controlling the fuel flow regulating means; means for activating said manual control system in the event of failure of the automatic system; and means operative in response to activation of said manual control system to operate said nozzle area control means to open the nozzle to its maximum limit, in order to maintain the temperature of the combustion gases at the turbine intake at a predetermined safe value.
Claim 13
Dependent Claim
171 words
A control device for a gas turbine power plant of the type comprising a compressor, a combustion chamber supplied with air coming from said compressor and with fuel, a turbine supplied with combustion gases coming from the combustion chamber, and a nozzle for discharging the combustion gases coming from said turbine, said control device comprising, in combination: means for regulating the rate of fuel flow to the combustion chamber; means operable to vary the cross-sectional area of the nozzle between maximum and minimum limits; an automatic control system for operating said nozzle cross-sectional area varying means; a normally inoperative manual control system for controlling the fuel flow regulating means; means for activating said manual control system in the event of failure of the automatic system; and means operative in response to activation of said manual control system to operate said nozzle area control means to open the nozzle to its maximum limit, in order to maintain the temperature of the combustion gases at the turbine intake at a predetermined safe value.
Claim 14
Dependent Claim
41 words
A control device according to claim 8, wherein the means for activating the manual control system comprise a normally disengaged coupling between said manual control system and said means for regulating said fuel flow, and control means for engaging said coupling.
Claim 15
Dependent Claim
45 words
A control system according to claim 9, wherein said coupling is operated by fluid pressure, and said control means comprise a valve arranged between a source of pressurized fluid and said coupling and adapted in its open position to supply said coupling with said fluid.
Claim 16
Dependent Claim
34 words
A control system according to claim 10, wherein said means operative to open the nozzle to maximum limit comprise pressure sensitive means responsive to the pressure of said pressurized fluid downstream of said valve.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |