Emergency electric power generation assembly for an aircraft, an aircraft and associated method

1. An emergency electric power generation assembly ( 24 ) for an aircraft ( 10 ), comprising an emergency electricity generator ( 60 ), intended to be connected to an electric network ( 20 ) of the aircraft,

the electricity generator assembly ( 24 ) being controllable between an inactive rest configuration in which the emergency electricity generator ( 60 ) is inactive and an active configuration for producing energy in which the emergency electricity generator ( 60 ) delivers emergency electric energy to the electric network ( 20 ) without being electrically powered by the electric network ( 20 ),

characterized in that the emergency electric power generation assembly ( 24 ) is able to be placed in an intermediate standby configuration, in which the emergency electric power generation assembly ( 24 ) is electrically powered by the electric network ( 20 ) so that the emergency electricity generator ( 60 ) produces standby electric energy with a power of less than the power delivered by the emergency electricity generator ( 60 ) in the active configuration.

2. The assembly ( 24 ) according to claim 1 , characterized in that the emergency electricity generator ( 60 ) includes a fuel cell ( 70 ).

3. The assembly ( 24 ) according to claim 2 , characterized in that it includes a first source ( 62 ) for supplying the emergency electricity generator ( 60 ) allowing the emergency electricity generator ( 60 ) to produce standby electric energy, the first supply source ( 62 ) being electrically powered by the electric network ( 20 ) in the intermediate standby configuration.

4. The assembly ( 24 ) according to claim 3 , characterized in that the first source ( 62 ) includes an electrolyzer ( 72 ) able to generate at least one gas fuel intended for feeding the fuel cell ( 70 ) upon receiving electric energy from the electric network ( 20 ).

5. The assembly ( 24 ) according to claim 3 , characterized in that it includes a second source ( 64 ) for supplying the emergency electricity generator ( 60 ), the second supply source ( 64 ) being able to supply the emergency electricity generator ( 60 ) without receiving any electric energy from the electric network ( 20 ) of the aircraft.

6. The assembly ( 24 ) according to claim 5 , characterized in that the second source ( 64 ) includes at least one gas fuel tank ( 90 , 92 ) for feeding the fuel cell ( 70 ).

7. The assembly ( 24 ) according to claim 5 , characterized in that the second source ( 64 ) is connected to the emergency electric energy generator ( 60 ) via a pyrotechnic actuator ( 98 A, 98 B), the pyrotechnic actuator ( 98 A, 98 B) being advantageously able to be activated by a mechanical, photonic, pyrotechnic, thermal or electric, energy command.

8. The assembly ( 24 ) according to claim 7 , characterized in that the pyrotechnic actuator includes a pyrotechnic valve ( 100 ).

9. The assembly ( 24 ) according to claim 8 , characterized in that the pyrotechnic valve ( 100 ) includes a first obturated tube segment ( 104 A) having a first end ( 114 A), and a second tube segment ( 104 B) obturated at one end ( 114 B) located facing the first end ( 114 A), the pyrotechnic valve ( 100 ) including a piston ( 106 ) which may be displaced between an inactive rest position in which the ends ( 114 A, 114 B) are obturated, and an active position for putting the first tube segment ( 104 A) in communication with the second tube segment ( 104 B).

10. The assembly ( 24 ) according to claim 1 , characterized in that it includes a first source ( 62 ) for supplying the emergency electricity generator ( 60 ) allowing the emergency electricity generator ( 60 ) to produce standby electric energy, the first supply source ( 62 ) being electrically powered by the electric network ( 20 ) in the intermediate standby configuration.

11. The assembly ( 24 ) according to claim 10 , characterized in that it includes a second source ( 64 ) for supplying the emergency electricity generator ( 60 ), the second supply source ( 64 ) being able to supply the emergency electricity generator ( 60 ) without receiving any electric energy from the electric network ( 20 ) of the aircraft.

12. The assembly ( 24 ) according to claim 11 , characterized in that the second source ( 64 ) is connected to the emergency electric energy generator ( 60 ) via a pyrotechnic actuator ( 98 A, 98 B), the pyrotechnic actuator ( 98 A, 98 B) being advantageously able to be activated by a mechanical, photonic, pyrotechnic, thermal or electric, energy command.

13. An aircraft ( 10 ) characterized in that it includes:

an electric network ( 20 );

at least one main electricity generator assembly ( 18 ) coupled with a propulsion engine ( 16 A, 16 B) of the aircraft ( 10 ) for providing electric energy to the electric network ( 20 ) when the propulsion engine ( 16 A, 16 B) is active;

an emergency electric power generation assembly ( 24 ) according to claim 1 , the emergency electricity generator ( 60 ) being connected to the electric network ( 20 ) of the aircraft.

14. The aircraft ( 10 ) according to claim 13 , characterized in that it includes an auxiliary electricity generator assembly ( 22 ) including an auxiliary generator ( 50 ) capable of operating independently of said or each propulsion engine ( 16 A, 16 B) of the aircraft and of the emergency electric power generation assembly ( 24 ), the auxiliary generator ( 50 ) being fed by a liquid fuel tank ( 36 ) present in the aircraft.

15. A method for generating electricity in an aircraft ( 10 ) including the following steps:

providing an emergency electric power generation assembly ( 24 ) according to claim 1 , the emergency electric energy generator ( 60 ) being connected to the electric network ( 20 ) of the aircraft ( 10 );

during a normal flight phase of the aircraft ( 10 ), operating the electricity generator assembly ( 24 ) in its intermediate standby configuration, the electricity generator assembly ( 24 ) being electrically powered by the electric network ( 20 ) of the aircraft, the emergency electricity generator ( 60 ) producing standby electric energy delivered to the electric network ( 20 );

during an emergency phase, controlling the emergency electric power generation assembly ( 24 ) from its standby configuration to its active configuration for producing energy in which it provides emergency electric energy to the electric network ( 20 ), without receiving any electric energy from the electric network ( 20 ), the emergency electric energy being of a power greater than that of the standby electric energy produced in the intermediate standby configuration.

16. The method according to claim 15 , characterized in that the emergency electric power generation assembly ( 24 ) includes a first source ( 62 ) for supplying the emergency electricity generator ( 60 ), able to power the emergency electricity generator ( 60 ) in order to produce standby electric energy, and in that in the intermediate standby configuration, the first supply source ( 62 ) is electrically powered by the electric network ( 20 ).

17. he method according to claim 16 , characterized in that the emergency electric power generation assembly ( 24 ) includes a second emergency source ( 64 ) for electrically powering ( 60 ) the generator, and in that, during the emergency phase, the second supply source ( 62 ) supplies the emergency electricity generator ( 60 ) without receiving any electric energy from the electric network ( 20 ).

18. The method according to claim 16 , characterized in that the emergency electricity generator ( 60 ) includes a fuel cell ( 70 ), the fuel cell ( 70 ) producing standby electric energy in the intermediate configuration.

19. The method according to claim 15 , characterized in that the emergency electric power generation assembly ( 24 ) includes a second emergency source ( 64 ) for electrically powering ( 60 ) the generator, and in that, during the emergency phase, the second supply source ( 62 ) supplies the emergency electricity generator ( 60 ) without receiving any electric energy from the electric network ( 20 ).

20. The method according to claim 15 , characterized in that the emergency electricity generator ( 60 ) includes a fuel cell ( 70 ), the fuel cell ( 70 ) producing standby electric energy in the intermediate configuration.