Jet Propulsion/Rotors

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The moving parts of the jet engine. The turbomachinery blades are mounted on a number of Rotors.

Contents 1 disks 1.1 Functional requirements 1.2 Disk Mechanics 1.3 Numerical Design 1.4 Example: 600m/s Tip speed turbine at 200 C 1.5 Centrifugal compressors 1.6 Axial compressor durms and stiffeners 1.7 Fan 1.8 Blade-off failure analysis 1.9 Bird Impact 1.10 Fatigue 1.11 Disk fracture 1.12 Clearance control 2 shafts 2.1 Torque 2.2 Thrust 2.3 Whirling 2.4 Gyroscopic effects 2.5 Multi shaft Dynamics 2.6 Materials, Manufacturing and Assembly 3 bearings 3.1 Functional requirements 3.2 Plain bearings 3.3 Roller and ball bearings 3.4 Air bearings 3.5 Thrust bearings 3.6 Bearing lubrication and cooling 4 Seals 4.1 Dynamic seals 4.2 Labyrinth Seals 4.3 Brush seals 5 Gas Pistons 5.1 Engine force balance 5.2 Takeoff 5.3 Cruise

[edit] disks

The disks provide structural fixing and resist the radial and axial forces generated by the airfoils in the fans. compressors, turbines.

[edit] Functional requirements

[edit] Disk Mechanics

[edit] Numerical Design

[edit] Example: 600m/s Tip speed turbine at 200 C

[edit] Centrifugal compressors

[edit] Axial compressor durms and stiffeners

[edit] Fan

[edit] Blade-off failure analysis

[edit] Bird Impact

[edit] Fatigue

[edit] Disk fracture

[edit] Clearance control

[edit] shafts

Shafts connect the functional parts and transfer forces from turbines to fans and compressors and to bearings.

[edit] Torque

[edit] Thrust

[edit] Whirling

[edit] Gyroscopic effects

[edit] Multi shaft Dynamics

[edit] Materials, Manufacturing and Assembly

[edit] bearings

The rotors are supported on bearings.

[edit] Functional requirements

Loading, Overloading, service life, lubrication

[edit] Plain bearings

[edit] Roller and ball bearings

[edit] Air bearings

[edit] Thrust bearings

[edit] Bearing lubrication and cooling

[edit] Seals

The pressure differentials between different rotating parts are maintained by seals.

[edit] Dynamic seals

[edit] Labyrinth Seals

[edit] Brush seals

[edit] Gas Pistons

[edit] Engine force balance

[edit] Takeoff

[edit] Cruise