Method of starting a gas turbine engine

Details Method of starting a gas turbine engine Method of starting a gas turbine engine

1991-02-14

1992-06-23

Casaregola, Louis J.

Power plants

Combustion products used as motive fluid

60 39142, F02C 7268

Patent

active

051232391

ABSTRACT:
A method of starting a gas turbine engine eliminating the need for oversizing a starter motor or the like to attain a proper transition through the "pinch point" includes the steps of applying a torque from an external source to the gas turbine engine (10) to accelerate the same toward a self sustaining speed, igniting fuel in the engine (10) at a pre-determined speed less than the self-sustaining speed, and at or about the time of fuel ignition, momentarily increasing the torque applied to accelerate the engine (10). The acceleration torque and momentary increase can be achieved by applying torque from a gas turbine containing auxiliary power unit (20) to an engine (10) either mechanically or pneumatically and then overspeeding and/or increasing the turbine inlet temperature of the gas turbine within the APU (20) to achieve a momentary burst of torque.

REFERENCES:
patent: 3020716 (1962-02-01), Greenly
patent: 3087305 (1963-04-01), Hertzog
patent: 3176959 (1965-04-01), Ellenberger
patent: 4461143 (1984-07-01), Shutt
patent: 5042963 (1991-08-01), Sorenson et al.

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