Monitoring of a high-pressure pump in a turbine engine fuel supply circuit
View Patent ↗A device and method for monitoring a high-pressure pump in a turbomachine fuel supply circuit by detecting opening of a pressurizing and shut-off valve mounted on an outlet side of a fuel flow regulating valve, by measuring rotational speed of the turbomachine corresponding to the opening of the pressurizing and cut-off valve, and by monitoring change in a value of the rotational speed to propose replacement of the high-pressure pump when the measure value rotational speed reaches a predetermined threshold.
1. A device for monitoring a high-pressure pump in a turbine engine fuel supply circuit, the circuit including a pressurizing and shut-off valve that is mounted at a flow outlet of a fuel metering valve and at a flow inlet of a supply duct of the injectors, and means for measuring rotational speed of the turbine engine, the device comprising:
means for detecting an opening of the pressurizing and shut-off valve;
means for recording a measured value of the rotational speed of the turbine engine at opening of the pressurizing and shut-off valve; and
means for comparing the measured value with a predetermined threshold, to propose replacement of the high-pressure pump when the recorded value of the rotational speed reaches the predetermined threshold,
wherein the pressurizing and shut-off valve remains in a closed position and prohibits the supply of the fuel to the injectors as long as a pressure of the fuel at the outlet of the fuel metering valve is less than a predetermined pressure threshold, and is in an opened position otherwise.
2. A device according to claim 1 , wherein the comparison threshold is determined so that a restarting in flight of the turbine engine is provided throughout an entire service life of the high-pressure pump.
3. A device according to claim 1 , further comprising:
means for measuring a temperature of fuel at an outlet of the pressurizing and shut-off valve; and
means for correcting the recorded value of the rotational speed according to a difference between the measured temperature and a predetermined temperature.
4. A turbine engine, or a turbojet or a turboprop engine, comprising the device for monitoring the high-pressure pump according to claim 1 .
5. A device according to claim 1 , further comprising an overspeed system which closes the pressurizing and shut-off valve using an elctro-hydraulic control member during starting phase of the turbine engine and after detection of the opening of the pressurizing and shut-off valve.
6. A device according to claim 1 , wherein the predetermined pressure threshold is 19 bars.
7. A method for monitoring a high-pressure pump in a turbine engine fuel supply circuit, comprising:
detecting opening of a pressurizing and shut-off valve;
recording a value of rotational speed of the turbine engine corresponding to the detected opening;
comparing the value with a predetermined threshold; and
proposing replacement of the high-pressure pump when the recorded value of the rotational speed reaches the predetermined threshold,
wherein the pressurizing and shut-off valve is mounted in the circuit at a flow outlet of a fuel metering valve and at a flow inlet of a supply duct of injectors, the pressurizing and shut-off valve remaining in a closed position and prohibiting the supply of the fuel to the injectors as long as a pressure of the fuel at the outlet of the fuel metering valve is less than a predetermined pressure threshold, and being in an opened position otherwise.
8. A method according to claim 7 , further comprising:
detecting the opening of the pressurizing and shut-off valve; and
recording the value of the corresponding rotational speed during each of starting phases of the turbine engine.
9. A method according to claim 8 , further comprising:
carrying out a test of an overspeed system during starting phase of the turbine engine and after detection of the opening of the pressurizing and shut-off valve.
10. A method according to claim 7 , further comprising:
measuring a temperature of fuel at an outlet of the pressurizing and shut-off valve; and
correcting the recorded value of the rotational speed according to a difference between the measured temperature of the fuel and a predetermined temperature value.
11. A method according to claim 7 , further comprising:
determining a comparison threshold of the recorded value of the rotational speed in such a way as to provide for restarting in flight of the turbine engine throughout an entire service life of the high-pressure pump.