Turbine Engines 1-2, De-icing & Anti-icing

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What is the purpose of an air inlet duct?

Channel incoming air to compressor with least possible energy loss.
Centrifugal-flow is named for...

Its manner of air processing.
What is a characteristic of a Centrifugal-flow engine?

Flow of air is turned 90° and accelerated outward by centrifugal action.
Axial-flow is named for...

Named after manner in which air moves thru compressor.
What are 4 advantages of an Axial-flow engine?
- High peak efficiencies
- Small frontal area for given airflow
- Straight thru flow - High ram efficiency
- increased pressure rise by increasing number of stages
What are 5 disadvantages of an Axial-flow engine?
- Good efficiency only over a narrow rotational speed range
- difficulty of manufacture and high cost
- relatively high weight
- high starting power requirements
- very susceptible to FOD
Severe Stalls are also known as? and can dramatically?
- Hung stalls.
- degrade engine output and can cause permanent damage and even catastrophic engine failure.
What are the 2 types of igniter plugs?
- Annular-gap or Long reach plug
- Constrained-gap plug
What are 3 characteristics of Annular-gap or Long reach plugs?
- sticks deeper into combustion chamber liner
- delivers spark directly into fuel/air mixture
- required to withstand significantly higher energy
What are 3 characteristics of Constrained-gap plugs?
- Has lower operating temp
- does not protect as far into combustion chamber lining
- spark jumps into flowing fuel/air mixture
What percent of total energy from an turbine goes into thrust?

20% - 40%
What percent of total energy from an turbine goes to drive compressor and accessories?

60% - 80%
The more accessories and equipment ran off an aircrafts turbine engine results in?
- Less energy for thrust
- Turbine extracts more kinetic energy from exhaust gases
What are 4 characteristics of a fixed shaft?
- Shaft goes directly to compressor and then to reduction gear box and prop shaft
- provides instantaneous power response
- provides controlled descents - no windmilling overspeed
- provides rapid reverse thrust
What are 5 characteristics of a free turbine
- 2 turbine wheels
- better control of prop speed
- easier engine starting
- low prop speed during taxiing
- prop can be stopped without shutting down engine
reverse thrust provides up to what percent of breaking power?

50%
most systems are capable of creating what percent of rated engine thrust in reverse direction?

45%
What are the 3 basic types or engine starting systems?
- Electric motor
- Air turbine
- Combustion
De-icing and Anti-icing systems are intended to?

Give pilot some options in situation where icing exists.
When should a pilot activate the De-icing system?

after about 1/2" of ice builds up, for maximum effectiveness.
A pneumatic de-icing system us used to remove ice from where?

ice that accumulated on the leading edge of a wing
Premature aging is caused by?

Ozone

Author

cmnaranjo

247766

Card Set

Turbine Engines 1-2, De-icing & Anti-icing

Description

Aircraft Systems

Updated

2013-11-22T08:26:30Z