Detection of the ingress of water or hail into a turbine engine

1. A detection method for detecting ingestion of water or hail in a gas turbine engine, the engine including at least a compressor, a combustion chamber, and a turbine, the method comprising:

estimating, using a processor, a value of a first indicator representative of water or hail being ingested;

estimating, using the processor, a value of a second indicator representative of water or hail being ingested, the second indicator being different from the first indicator;

calculating, using the processor, a value of a global indicator by summing at least the first indicator and the second indicator;

measuring temperature at an inlet of the combustion chamber;

estimating, using the processor, a temperature modeling the measured temperature; and

filtering, using the processor, the measured temperature,

wherein the value of the first indicator is estimated as a function of a difference between a drop in the measured temperature and a drop in the estimated temperature, and the value of the second indicator is estimated as a function of a difference between the measured temperature and the estimated temperature, and

wherein the value of the second indicator is estimated as a function of the difference between the measured temperature as filtered and the estimated temperature.

2. A detection method according to claim 1 , wherein the value of the first indicator is estimated while taking account of a normalization function that minimizes an importance of small drops in the measured temperature.

3. A detection method according to claim 1 , further comprising:

measuring a speed of rotation of the compressor and of the turbine;

wherein the value of the second indicator is estimated while taking account of a normalization function that depends on a variation in time of the speed of rotation.

4. A detection method according to claim 1 , further comprising:

measuring a fuel flow rate; and

estimating, using the processor, the value of a third indicator representative of water or hail being ingested as a function at least of the fuel flow rate;

wherein the value of the global indicator is calculated by summing the first indicator, the second indicator, and the third indicator.

5. A detection method according to claim 4 , further comprising:

measuring a speed of rotation of the compressor and of the turbine;

wherein the value of the third indicator is estimated as a function of a drop in the speed of rotation.

6. A method of controlling a gas turbine engine including at least a compressor, a combustion chamber, and a turbine, the method comprising:

determining a fuel flow rate setpoint within a range limited by a top limit;

detecting ingestion of water or hail by

estimating, using a processor, a value of a first indicator representative of water or hail being ingested;

estimating, using the processor, a value of a second indicator representative of water or hail being ingested, the second indicator being different from the first indicator;

calculating, using the processor, a value of a global indicator by summing at least the first indicator and the second indicator;

measuring temperature at an inlet of the combustion chamber;

estimating, using the processor, a temperature modeling the measured temperature; and

filtering, using the processor, the measured temperature,

wherein the value of the first indicator is estimated as a function of a difference between a drop in the measured temperature and a drop in the estimated temperature, and the value of the second indicator is estimated as a function of a difference between the measured temperature and the estimated temperature, and

wherein the value of the second indicator is estimated as a function of the difference between the measured temperature as filtered and the estimated temperature; and

in response to detecting the ingestion of water or hail, determining a fuel flow rate setpoint in a range that exceeds the top limit.

7. A method of controlling a gas turbine engine including at least a compressor, a combustion chamber, and a turbine, the method comprising:

detecting ingestion of water or hail by

estimating, using a processor, a value of a first indicator representative of water or hail being ingested;

estimating, using the processor, a value of a second indicator representative of water or hail being ingested, the second indicator being different from the first indicator;

calculating, using the processor, a value of a global indicator by summing at least the first indicator and the second indicator;

measuring temperature at an inlet of the combustion chamber;

estimating, using the processor, a temperature modeling the measured temperature; and

filtering, using the processor, the measured temperature,

wherein the value of the first indicator is estimated as a function of a difference between a drop in the measured temperature and a drop in the estimated temperature, and the value of the second indicator is estimated as a function of a difference between the measured temperature and the estimated temperature, and

wherein the value of the second indicator is estimated as a function of the difference between the measured temperature as filtered and the estimated temperature; and

in response to detecting the ingestion of water or hail that has led to a flame-out, selecting a re-ignition fuel flow rate higher than a nominal re-ignition fuel flow rate.

8. A method of controlling a gas turbine engine including at least a compressor, a combustion chamber, and a turbine, the method comprising:

detecting ingestion of water or hail by

estimating, using a processor, a value of a first indicator representative of water or hail being ingested;

estimating, using the processor, a value of a second indicator representative of water or hail being ingested, the second indicator being different from the first indicator;

calculating, using the processor, a value of a global indicator by summing at least the first indicator and the second indicator;

measuring temperature at an inlet of the combustion chamber;

estimating, using the processor, a temperature modeling the measured temperature; and

filtering, using the processor, the measured temperature,

wherein the value of the first indicator is estimated as a function of a difference between a drop in the measured temperature and a drop in the estimated temperature, and the value of the second indicator is estimated as a function of a difference between the measured temperature and the estimated temperature, and

wherein the value of the second indicator is estimated as a function of the difference between the measured temperature as filtered and the estimated temperature; and

determining an idling speed setpoint as a function of the global indicator.

9. A non-transitory computer readable medium storing a program for detecting ingestion of water or hail in a gas turbine engine, the engine including at least a compressor, a combustion chamber, and a turbine, wherein the program, when executed, cause a computer to perform a method comprising:

estimating a value of a first indicator representative of water or hail being ingested;

estimating a value of a second indicator representative of water or hail being ingested, the second indicator being different from the first indicator;

calculating a value of a global indicator by summing at least the first indicator and the second indicator;

measuring temperature at an inlet of the combustion chamber;

estimating a temperature modeling the measured temperature; and

filtering the measured temperature,

wherein the value of the first indicator is estimated as a function of a difference between a drop in the measured temperature and a drop in the estimated temperature, and the value of the second indicator is estimated as a function of a difference between the measured temperature and the estimated temperature, and

wherein the value of the second indicator is estimated as a function of the difference between the measured temperature as filtered and the estimated temperature.

10. An electronic unit for controlling a gas turbine engine, the electronic unit comprising a memory including the computer readable medium according to claim 9 .

11. An aeroengine comprising a gas turbine engine and an electronic unit according to claim 10 .