MILPORT - APR 1
MILPORT - Aircraft Performance
MILPORT - Aircraft Performance
Kartei Details
| Karten | 57 |
|---|---|
| Sprache | English |
| Kategorie | Verkehrskunde |
| Stufe | Andere |
| Erstellt / Aktualisiert | 12.09.2016 / 16.01.2023 |
| Weblink |
https://card2brain.ch/box/milport_acft_per
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| Einbinden |
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Name some of the features of the F404 engine of the FA18s? (3)
- fan smoothes airflow before it enters compressor -> high resistance to compressor stalls
- high responsiveness to control inputs
- IECMS -> in-flight engine condition monitoring system: monitors for critical malfunctions and keeps track of parts lifetimes
GE developed the ........? to provide more power for the Swiss export models of the F/A-18.
F404-GE-402
Define the following features of the F404-GE-402 engine:
- type
- compressor
- bypass ratio
- turbine
- overall pressure ratio
type: afterburning turbofan
compressor: axial compressor with 3 fan and 7 compressor stages
bypass ratio: 0.34:1
turbine: 1 low-pressure and 1 high-pressure stage
overall pressure ratio: 26:1
Explain the general principle of a turboprop engine.
air is drawn into intake and compressed by compressor - in combustion chamber fuel is added and fuel-air mixture combusts - hot combustion gases expand through turbine - turbine drives partly the compressor and mainly transmitts the power through a reduction gearbox to the probeller - some of the gases expand through nozzle (only minor part of propulsion)
Name the basic components of a turboprob engine. (5)
- intake
- compressor
- combustor
- turbine
- propelling nozzle
Where are turboprop engines generally used?
small subsonic aircraft (PC7, PC9, PC21)
What is the gearbox for?
To reduce the RPM from the turbine for the propeller.
The propeller is normally a .....? type.
constant speed (variable pitch)
Where are turboprops mostly used? (for what requirements)
where high-performance short-takeoff and landing (STOL) capability and efficiency at modest flight speeds are required
What's the difference between turboprop and turbo shaft engines?
turboprop: gearbox is part of the engine
turbo shaft: (helicopters) gearbox is remote from engine
While most modern turbojet and turbofan engines use axial-flow compressors, turboprop engines usually contain at least one stage of ......? compression.
centrifugal
What can be used to increase the efficiency of propellers?
alter the pitch (adjusting it to the airspeed)
What can altering pitch of a propeller be used for additionally?
- to generate negative thrust (while decelerating on the runway)
- feathering (minimizing drag of a non-functioning propeller)
What's the purpose of an afterburner?
to provide a temporary increase in thrust, for:
- supersonic flight
- take-off
- combat situations
How does an afterburner work?
Injecting additional fuel into the jet pipe downstream of the turbine.
What's the advantage and disadvantage of an afterburner?
advantage: significantly increased thrust
disadvantage: very high fuel consumption and inefficiency
When are engines considered to be wet/dry? What is military/maximum power?
operating wet = afterburning is used
operating dry = no afterburning
engine producing maximum thrust wet = maximum power
engine producing maximum thrust dry = military power
