US3597974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluidic temperature sensor for gas turbine engines
Assignee: Avco Corp
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Filing: 1970-04-20
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Granted: 1971-08-10
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Expires: 1990-04-20
Abstract
Abstract The disclosure illustrates a fluidic temperature sensor comprising a fluidic oscillator mounted in a blade of the turbine assembly of a gas turbine engine. The oscillator has an inlet which receives hot gas through which the blade rotates. An openended signal output tube extends from the oscillator to the periphery of the blade. A generally conical stationary receiver port is positioned in a circumferential shroud which surrounds the turbine blade and receives the pressure oscillation signals emanating from the fluidic oscillators in the blade. The period of response for the oscillator is selected so that the resultant pressure frequency signal at the receiver port is an average of the temperature of the gas through which the blade passes in between successive passes over the receiver port.
Inventors
- 👤 Jay I Black
- 👤 Robert A Hatch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:07
CPC Classifications
G; G01; G01K; G01K13/00; G01K13/02; G01K11/00; G01K11/22
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
173 words
A fluidic temperature sensor assembly for use in a gas turbine engine having a rotor and radially extending blades which rotate through a motive fluid stream, said engine having a circumferential shroud closely adjacent the peripheral paths of said blades, said sensor assembly comprising; at least one fluidic oscillator mounted on a blade of the rotor having an inlet positioned to receive said motive fluid stream and having a resonant chamber in which pressure oscillations having a frequency proportional to the temperature in the chamber are set up, said fluidic oscillator having an open signal outlet passageway extending radially to the periphery of said blade; a stationary receiver port mounted in said shroud for receiving the acoustical signals from said signal outlet passageway as said blade rotates across said receiver port; means connected to said receiver port for providing a signal output directly proportional to the frequency of the pressure oscillations in said receiver port; whereby said sensor gives an output proportional to the motive fluid stream temperature through which said blade rotates.
Claim 2
Dependent Claim
173 words
A fluidic temperature sensor assembly for use in a gas turbine engine having a rotor and radially extending blades which rotate through a motive fluid stream, said engine having a circumferential shroud closely adjacent the peripheral paths of said blades, said sensor assembly comprising; at least one fluidic oscillator mounted on a blade of the rotor having an inlet positioned to receive said motive fluid stream and having a resonant chamber in which pressure oscillations having a frequency proportional to the temperature in the chamber are set up, said fluidic oscillator having an open signal outlet passageway extending radially to the periphery of said blade; a stationary receiver port mounted in said shroud for receiving the acoustical signals from said signal outlet passageway as said blade rotates across said receiver port; means connected to said receiver port for providing a signal output directly proportional to the frequency of the pressure oscillations in said receiver port; whereby said sensor gives an output proportional to the motive fluid stream temperature through which said blade rotates.
Claim 3
Dependent Claim
53 words
A fluidic temperature sensor assembly as in claim 1 wherein said fluidic oscillator is dimensioned to have a sufficient time constant so that the signal received by said stationary receiver port represents the average of a substantial portion of the circumferential path the blade traverses between subsequent passes over said stationary receiver port.
Claim 4
Dependent Claim
49 words
A fluidic temperature sensor as in claim 1 wherein said stationary receiver port comprises a passageway having an opening elongated in the direction of the plane of rotation of said blade, whereby the acoustical pressure signals are received for a portion of the path of rotation of said blade.
Claim 5
Dependent Claim
47 words
A fluidic temperature sensor assembly as in claim 3 wherein said receiver port has an inlet portion which converges from said elongated opening to an inner reduced cross-sectional area portion, thereby to recover pressure of the signal extending between the fluidic oscillator and the stationary receiver port.
Claim 6
Dependent Claim
50 words
A fluidic temperature sensor assembly as in claim 4 wherein said passageway further comprises an elongated closed inner portion extending from said converging inlet portion, said signal output means being connected to said passageway at a position spaced from the end of said passageway, whereby said signal means is cooled.
Claim 7
Dependent Claim
27 words
A fluidic temperature sensor assembly as in claim 1 wherein a pair of fluidic oscillators are mounted on blades spaced 180* from one another on said rotor.
Claim 8
Dependent Claim
77 words
A fluidic temperature sensor assembly as in claim 1 wherein said signal outpuT means comprises: means for providing a signal output in direct proportion to the high frequency acoustical pulses discharged from said oscillators thereby indicating the temperature of the motive fluid stream; and means for providing a signal output in direct proportion to the presence of the acoustical signal on said receiver port whereby said signal is proportional to the speed of rotation of said rotor.
Claim 9
Dependent Claim
55 words
A fluidic temperature sensor assembly as in claim 1 wherein the resonant chamber and an inlet port of said fluidic oscillator extends to said chamber from a position facing the inlet gas relative velocity vector of said blade, whereby said oscillator receives total pressure of the fluid immediately adjacent the leading edge of said blade.
Claim 10
Dependent Claim
33 words
A fluidic temperature sensor assembly as in claim 8 wherein said oscillator further comprises an outlet extending from said resonant chamber to a discharge point facing substantially the opposite direction of said inlet.
Claim 11
Dependent Claim
69 words
A fluidic temperature sensor assembly as in claim 9 wherein said stationary receiver port comprises: a passageway having an opening elongated in the direction of the plane of rotation of said blade, said receiver port converging from said elongated opening to an inner closed end, reduced cross-sectional elongated portion; said signal output means being connected to said passageway at a position spaced from the end of said elongated passageway.
References Cited (Backward Citations)
US3403509A
Cited
US3494195A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |