Transcript Electric Propulsion - University of California, Irvine

Turbojet and Turbofan
Performances
ME 112
Turbojet with Axial Compresor
Turbojet Static ST and SFC (M=0)
Turbojet ST and SFC at M=0.85
Turbojet ST and SFC at M=2.00
Turbojet ST and SFC at M=3.00
Turbojet Propulsion Efficiency
Turboprop Engine
High power density, high propulsion efficiency (large mass flow rate of propellent)
Loss of efficiency, vibrations, noise at high speed.
Comparison of Turbojet, Turboprop, Turbofan
Propulsion Efficiency
Turbofan: Modern Mainstream
Engine for Civil Transports
Combines the advantages of turbojet and turboprop:
higher efficiency than turbojet, higher speed than turboprop
Turbofan Engine Performance Calculations
Turbofan ST and SFC at M=0.00
Turbofan ST and SFC at M=0.85
Efficiencies of Turbojet and Turbofan
High-bypass Turbofan
GE 90 (Boeing 777)
High-bypass Turbofan
Rolls-Royce Trent 900 (Airbus 380)
Engine Alliance (P&W/GE) GP7000 High Bypass Turbofan Engine
24 Swept wide-chord
Hollow titanium fan blades
5-stage low-pressure
axial compressor
2-stage high-pressure turbine
9-stage high-pressure
axial compressor
6-stage low-pressure turbine
Single annular combustor
Unpublished Notes
[email protected]
18
Pratt-Whitney PW1000G:
Geared Turbofan
Turboshaft Engine
used for helicopters and power
generation
Turboprop Engine Propeller Power Optimization
Propulsion Efficiency of Prop-fan and Contrarotating Fan
Future of Turbofan?
Prop-fan, Open Rotor,
Contrarotating Fan, etc.
Turbofan
Open Rotor Concept