US3789665A
Expired / Lapsed
US
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Inferred measurement of the turbine inlet temperature of a gas turbine engine
Assignee: Avco Corp
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Filing: 1972-02-22
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Granted: 1974-02-05
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Expires: 1992-02-22
Abstract
Abstract Turbine inlet temperature of a gas turbine engine is determined by solving the equation T5 C''Wf/P + T3, where T5 is the gas producer turbine inlet temperature, Wf is the fuel flow, C'' is essentially a constant determined by the type of fuel (but varying slowly with changes in ambient pressure), P is the difference between the static pressure in the bellmouth inlet to the compressor and the ambient pressure, and T3 is the compressor outlet temperature. T5 is computed by developing three analog frequencies representing Wf, P , and T3, respectively. The division Wf/P is accomplished by counting the number of pulses generated by Wf during the occurrence of a given number of pulses representing P . Thereafter the system counts and adds the number of pulses representing T3 generated during a clocked period.
Inventors
- 👤 R Hohenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:26
CPC Classifications
G; G01; G01K; G01K13/00; G01K13/02; F; F02; F02C; F02C9/00; F02C9/26; F02C9/28; G06; G06J; G06J1/00; F05; F05D; F05D2270/00; F05D2270/01; F05D2270/11; F05D2270/112
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
228 words
In combination with a gas turbine engine having an air inlet bellmouth for delivering air to the inlet of an air compressor, said air compressor delivering compressed air from itS outlet to a combustor supplied with fuel through a fuel line, and a turbine driven by the gases delivered at its inlet from the outlet of said combustor, means for determining the inlet temperature of said turbine, said means comprising: means for generating a first signal comprised of first pulses having a pulse repetition rate proportional to the rate of flow of fuel through said fuel line; means for generating a second signal comprised of second pulses having a pulse repetition rate proportional to the magnitude of the difference in pressure between the static pressure in said bellmouth and ambient pressure; means for generating a third signal comprised of third pulses having a repetition rate proportional to the temperature in said compressor outlet; means during a variable first time period inversely proportional to the repetition rate of said second pulses for couning the number of said first pulses generated during said first time period; means during a fixed second time period for counting the number of said third pulses generated during said second time period; and means for summing the numbers of said first and third pulses counted during said time periods and for displaying the summation thereof.
Claim 2
Dependent Claim
228 words
In combination with a gas turbine engine having an air inlet bellmouth for delivering air to the inlet of an air compressor, said air compressor delivering compressed air from itS outlet to a combustor supplied with fuel through a fuel line, and a turbine driven by the gases delivered at its inlet from the outlet of said combustor, means for determining the inlet temperature of said turbine, said means comprising: means for generating a first signal comprised of first pulses having a pulse repetition rate proportional to the rate of flow of fuel through said fuel line; means for generating a second signal comprised of second pulses having a pulse repetition rate proportional to the magnitude of the difference in pressure between the static pressure in said bellmouth and ambient pressure; means for generating a third signal comprised of third pulses having a repetition rate proportional to the temperature in said compressor outlet; means during a variable first time period inversely proportional to the repetition rate of said second pulses for couning the number of said first pulses generated during said first time period; means during a fixed second time period for counting the number of said third pulses generated during said second time period; and means for summing the numbers of said first and third pulses counted during said time periods and for displaying the summation thereof.
Claim 3
Dependent Claim
44 words
The invention as defined in claim 1 wherein said variable first time period is established by means of a preset divider, said second pulses being applied to said divider, said first time period being equal to the time required to fill said preset divider.
Claim 4
Dependent Claim
58 words
The invention as defined in claim 2 wherein said fixed second time period is established by means of a clock oscillator, said oscillator having an output comprised of pulses having a fixed pulse repetition rate, said pulses being applied to said preset divider, said second time period being equal to the time required to fill said preset divider.
Claim 5
Dependent Claim
277 words
In combination with a gas turbine engine having an air inlet bellmount for delivering air to the inlet of an air compressor, said air compressor delivering compressed air from its outlet to a combustor supplied with fuel through a fuel line, and a turbine driven by the gases delivered at its inlet from the outlet of said combustor, means for determining the inlet temperature of said turbine, said means comprising: fuel flow transducer means in said fuel line for generating a fuel flow signal comprised of first pulses having a first pulse repetition rate proportional to the rate of flow of fuel through said fuel line; a pressure transducer for generating a pressure signal having a voltage magnitude proportional to the magnitude of the difference between the static pressure in said bellmouth and ambient pressure; means for converting said pressure signal to second pulses having a second pulse repetition rate proportional to the magnitude of said static pressure; a temperature transducer positioned in said compressor outlet for generating a temperature signal having a voltage magnitude proportional to the temperature in said compressor outlet; means for converting said temperature signal to third pulses having a third pulse repetition rate proportional to the magnitude of said temperature; means during a variable first time period inversely proportional to said second pulse repetition rate for counting the number of said first pulses generated during said first time period; means during a fixed second time period for counting the numbers of said third pulses generated during said second time period; and means for summing the numbers of said first and third pulses counted during said periods and for displaying the summation thereof.
Claim 6
Dependent Claim
277 words
In combination with a gas turbine engine having an air inlet bellmount for delivering air to the inlet of an air compressor, said air compressor delivering compressed air from its outlet to a combustor supplied with fuel through a fuel line, and a turbine driven by the gases delivered at its inlet from the outlet of said combustor, means for determining the inlet temperature of said turbine, said means comprising: fuel flow transducer means in said fuel line for generating a fuel flow signal comprised of first pulses having a first pulse repetition rate proportional to the rate of flow of fuel through said fuel line; a pressure transducer for generating a pressure signal having a voltage magnitude proportional to the magnitude of the difference between the static pressure in said bellmouth and ambient pressure; means for converting said pressure signal to second pulses having a second pulse repetition rate proportional to the magnitude of said static pressure; a temperature transducer positioned in said compressor outlet for generating a temperature signal having a voltage magnitude proportional to the temperature in said compressor outlet; means for converting said temperature signal to third pulses having a third pulse repetition rate proportional to the magnitude of said temperature; means during a variable first time period inversely proportional to said second pulse repetition rate for counting the number of said first pulses generated during said first time period; means during a fixed second time period for counting the numbers of said third pulses generated during said second time period; and means for summing the numbers of said first and third pulses counted during said periods and for displaying the summation thereof.
Claim 7
Dependent Claim
44 words
The invention as defined in claim 4 wherein said variable first time period is established by means of a preset divider, said second pulses being applied to said divider, said first time period being equal to the time required to fill said preset divider.
Claim 8
Dependent Claim
58 words
The invention as defined in claim 5 wherein said fixed second time period is established by means of a clock oscillator, said oscillator having an output comprised of pulses having a fixed pulse repetition rate, said pulses being applied to said preset divider, said second time period being equal to the time required to fill said preset divider.
Claim 9
Dependent Claim
208 words
In combination with a gas turbine engine having an air compressor delivering compressed air from its outlet to a combustor supplied with fuel through a fuel line, and a turbine driven by the gases delivered at its inlet from the outlet of said combustor, means for determining the inlet temperature of said turbine, said means comprising: means for generating a first signal comprised of first pulses having a pulse repetition rate proportional to the rate of flow of fuel through said fuel line; means for generating a second signal comprised of second pulses having a pulse repetition rate which is a function of the magnitude of the airflow from said compressor; means for generating a third signal comprised of third pulses having a repetition rate proportional to the temperature in said compressor outlet; means during a variable first time period inversely proportional to the repetition rate of said second pulses for counting the number of said first pulses generated during said first time period; means during a fixed second time period for counting the number of said third pulses generated during said second time period; and means for summing the numbers of said first and third pulses counted during said time periods and for displaying the summation thereof.
Claim 10
Dependent Claim
208 words
In combination with a gas turbine engine having an air compressor delivering compressed air from its outlet to a combustor supplied with fuel through a fuel line, and a turbine driven by the gases delivered at its inlet from the outlet of said combustor, means for determining the inlet temperature of said turbine, said means comprising: means for generating a first signal comprised of first pulses having a pulse repetition rate proportional to the rate of flow of fuel through said fuel line; means for generating a second signal comprised of second pulses having a pulse repetition rate which is a function of the magnitude of the airflow from said compressor; means for generating a third signal comprised of third pulses having a repetition rate proportional to the temperature in said compressor outlet; means during a variable first time period inversely proportional to the repetition rate of said second pulses for counting the number of said first pulses generated during said first time period; means during a fixed second time period for counting the number of said third pulses generated during said second time period; and means for summing the numbers of said first and third pulses counted during said time periods and for displaying the summation thereof.
Claim 11
Dependent Claim
44 words
The invention as defined in claim 7 wherein said variable first time period is established by means of a preset divider, said second pulses being applied to said divider, said first time period being equal to the time required to fill said preset divider.
Claim 12
Dependent Claim
58 words
The invention as defined in claim 8 wherein said fixed second time period is established by means of a clock oscillator, said oscillator having an output comprised of pulses having a fixed pulse repetition rate, said pulses being applied to said preset divider, said second time period being equal to the time required to fill said preset divider.
References Cited (Backward Citations)
US2809492A
Cited
US3377848A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |