Improving the dynamic behavior of the drive shaft of the fan rotor of an aeronautical propulsion system
AssigneeSafran Aircraft Engines
InventorDidier René André ESCURE
Life of this patent
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Abstract
An aeronautical propulsion system includes a first turbine that drives a first compressor via a first shaft, a second turbine that drives a second compressor via a second shaft that rotates at a higher speed than the first shaft, a fan rotor connected to a fan shaft, and a reduction structure coupling the first shaft and the fan shaft to drive the fan shaft at a rotation speed lower than the rotation speed of the first shaft. An average radius of a bore of the second turbine is based on an average radius of the bore of the second turbine, a thrust of the propulsion system, a bypass ratio of the propulsion system, and several constants.
Claims23
A propulsion system comprising:
- a first turbine configured to drive a first compressor via a first shaft about an axis of rotation;
- a second turbine configured to drive a second compressor via a second shaft, the second shaft being configured to rotate at a higher speed than the first shaft about the axis of rotation;
- a fan rotor connected to a fan shaft;
- a reduction structure coupling the first shaft and the fan shaft in order to drive the fan shaft at a rotation speed lower than the rotation speed of the first shaft;
- wherein an average radius of a bore of the second turbine meets the following formula:
- G
- *
- FN
- *
- BPR
- *
- 10
- -
- 4
- +
- H
- ≤
- R
- m
- a
- ≤
- I
- *
- FN
- *
- BPR
- *
- 10
- -
- 4
- +
- J
- where:
- Rm_a is the average radius of the bore of the second turbine in millimeters (mm);
- FN is a thrust of the propulsion system measured when the propulsion system is stationary in take-off rating in a standard atmosphere and at sea level and is expressed in Newton (N);
- BPR is a bypass ratio of the propulsion system and is measured when the propulsion system is stationary in take-off rating in a standard atmosphere and at sea level;
- and
- G=0.16 millimeters per Newton, H=18 millimeters, I=0.16 millimeters per Newton and J=28 millimeters.
A method for operating a propulsion system comprising a reduction structure coupling a first turbine and a fan rotor to drive the fan rotor at a lower speed than a speed of the first turbine, and a second turbine configured to rotate at a higher speed than the first turbine, the second turbine being dimensioned such that an average radius of a bore of the second turbine meets the following formula:
- G
- *
- FN
- *
- BPR
- *
- 10
- -
- 4
- +
- H
- ≤
- R
- m
- a
- ≤
- I
- *
- FN
- *
- BPR
- *
- 10
- -
- 4
- +
- J
- where:
- Rm_a is the average radius of the bore of the second turbine in millimeters;
- FN is a thrust of the propulsion system measured when the propulsion system is stationary in take-off rating in a standard atmosphere and at sea level and is expressed in Newton;
- BPR is a bypass ratio of the propulsion system and is measured when the propulsion system is stationary in take-off rating in a standard atmosphere and at sea level;
- and
- G=0.16 millimeters per Newton, H=18 millimeters, I=0.16 millimeters per Newton and J=28 millimeters,
- wherein the method comprises operating the propulsion system having the second turbine that has been dimensioned.
A method for manufacturing a propulsion system comprising:
- dimensioning the propulsion system comprising a reduction structure coupling a first turbine and a fan rotor to drive the fan rotor at a lower speed than a speed of the first turbine, and a second turbine configured to rotate at a higher speed than the first turbine, the second turbine being dimensioned such that an average radius of a bore of the second turbine meets the following formula:
- G
- *
- FN
- *
- BPR
- *
- 10
- -
- 4
- +
- H
- ≤
- R
- m
- a
- ≤
- I
- *
- FN
- *
- BPR
- *
- 10
- -
- 4
- +
- J
- where:
- Rm_a is the average radius of the bore of the second turbine in millimeters;
- FN is a thrust of the propulsion system measured when the propulsion system is stationary in take-off rating in a standard atmosphere and at sea level and is expressed in Newton;
- BPR is a bypass ratio of the propulsion system and is measured when the propulsion system is stationary in take-off rating in a standard atmosphere and at sea level;
- and
- G=0.16 millimeters per Newton, H=18 millimeters, I=0.16 millimeters per Newton and J=28 millimeters;
- and
- manufacturing the propulsion system.
Dependencies are inferred from the claim text.