Gas turbine engine variable area fan nozzle control
First Claim
Patent Images
1. A method of managing a gas turbine engine comprising the steps of:
- detecting an airspeed;
detecting a fan speed;
referencing a parameter relationship related to a desired variable area fan nozzle position based upon at least airspeed and fan speed, the parameter relationship includes at least one of first and second thresholds respectively corresponding to upper and lower fan speed limits that provide a schedule of curves of the fan speed in relation to a fan aerodynamic design speed, wherein the upper and lower fan speed limits are less than the fan aerodynamic design speed, and comparing the detected airspeed and detected fan speed to the parameter relationship to determine a target variable area fan nozzle position according to the schedule of curves; and
adjusting an actual variable area fan nozzle position to the target variable area fan nozzle position.
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Abstract
A method of managing a gas turbine engine includes the steps of detecting an airspeed and detecting a fan speed. A parameter relationship is referenced related to a desired variable area fan nozzle position based upon at least airspeed and fan speed. The detected airspeed and detected fan speed is compared to the parameter relationship to determine a target variable area fan nozzle position. An actual variable area fan nozzle position is adjusted in response to the determination of the target area fan nozzle position and at least one threshold.
69 Citations
16 Claims
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1. A method of managing a gas turbine engine comprising the steps of:
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detecting an airspeed; detecting a fan speed; referencing a parameter relationship related to a desired variable area fan nozzle position based upon at least airspeed and fan speed, the parameter relationship includes at least one of first and second thresholds respectively corresponding to upper and lower fan speed limits that provide a schedule of curves of the fan speed in relation to a fan aerodynamic design speed, wherein the upper and lower fan speed limits are less than the fan aerodynamic design speed, and comparing the detected airspeed and detected fan speed to the parameter relationship to determine a target variable area fan nozzle position according to the schedule of curves; and adjusting an actual variable area fan nozzle position to the target variable area fan nozzle position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A gas turbine engine comprising:
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fan nacelle including a flap configured to be movable between first and second positions; an actuator operatively coupled to the flap; and a controller configured to reference a parameter relationship that relates to a desired variable area fan nozzle position based upon at least airspeed and fan speed, the controller configured to compare a detected airspeed and a detected fan speed to the parameter relationship to determine a target variable area fan nozzle position, the parameter relationship includes at least one of first and second thresholds respectively corresponding to lower and upper fan speed limits that provide a schedule of curves of the fan speed in relation to a fan aerodynamic design speed, wherein the upper and lower fan speed limits are less than the fan aerodynamic design speed, and the controller configured to provide a command to the actuator to adjust the flap from the first position to the second position corresponding to the target variable fan nozzle position, the target variable area fan nozzle position selected according to the schedule of curves. - View Dependent Claims (14, 15, 16)
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Specification