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AssigneeSafran Helicopter Engines
InventorsVincent POUMAREDE, Sylvain Pierre VOTIE, Lucie Stéphanie APOSTIN
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Method for starting an aeronautical free turbine and single-spool gas generator turbomachine of a twin-engine aircraft including two independent electrical networks each comprising a 28V battery selectively powering a starter-generator, in which, to ensure, under the control of a turbomachine regulation computer, the startup of the turbomachine first at a voltage of 28V by putting the two batteries in parallel and then at a voltage of 56V by putting them in series while avoiding too rapid acceleration of the gas generator, the serialization of the two batteries is ordered only once the combustion chamber of the gas generator is ignited and the speed of the gas generator is greater than a predetermined speed threshold N1 for ensuring, through this serialization, a positive acceleration margin at the point of maximum drag of the gas generator.
A method for starting an aeronautical free turbine and single-spool gas generator turbomachine of a twin-engine aircraft including two independent electrical networks each comprising a 28V battery selectively powering a starter-generator, wherein to ensure, under the control of a turbomachine regulation computer, the startup of the turbomachine first at a nominal voltage of 28V by putting the two batteries in parallel and then at a nominal voltage of 56V by putting them in series while avoiding too rapid acceleration of the gas generator, the serialization of the two batteries is ordered only once the combustion chamber is ignited and the speed of the gas generator is greater than a predetermined speed threshold N1 for ensuring, through this serialization, a positive acceleration margin at the point of maximum drag of the gas generator.
A system for starting an aeronautical free turbine and single-spool gas generator turbomachine of a twin-engine aircraft including two independent electrical networks each comprising a 28V battery selectively powering a starter-generator, a turbomachine regulation computer controlling the startup of the turbomachine first at a nominal voltage of 28V by putting the two batteries in parallel and then at a nominal voltage of 56V by putting them in series while avoiding too rapid acceleration of the gas generator, characterized in that the turbomachine regulation computer is configured to order the serialization of the two batteries only once the combustion chamber of the gas generator is ignited and the speed of the gas generator is greater than a predetermined speed threshold N1 for ensuring, through this serialization, a positive acceleration margin at the point of maximum drag of the gas generator.
Dependencies are inferred from the claim text.