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

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Author:
cmnaranjo
ID:
247766
Filename:
Turbine Engines 1-2, De-icing & Anti-icing
Updated:
2013-11-22 03:26:30
Tags:
AC Systems
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Description:
Aircraft Systems
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  1. What is the purpose of an air inlet duct?
    Channel incoming air to compressor with least possible energy loss.
  2. Centrifugal-flow is named for...
    Its manner of air processing.
  3. What is a characteristic of a Centrifugal-flow engine?
    Flow of air is turned 90° and accelerated outward by centrifugal action.
  4. Axial-flow is named for...
    Named after manner in which air moves thru compressor.
  5. 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
  6. 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
  7. Severe Stalls are also known as? and can dramatically?
    • Hung stalls.
    • degrade engine output and can cause permanent damage and even catastrophic engine failure.
  8. What are the 2 types of igniter plugs?
    • Annular-gap or Long reach plug
    • Constrained-gap plug
  9. 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
  10. 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
  11. What percent of total energy from an turbine goes into thrust?
    20% - 40%
  12. What percent of total energy from an turbine goes to drive compressor and accessories?
    60% - 80%
  13. 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
  14. 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
  15. 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
  16. reverse thrust provides up to what percent of breaking power?
    50%
  17. most systems are capable of creating what percent of rated engine thrust in reverse direction?
    45%
  18. What are the 3 basic types or engine starting systems?
    • Electric motor
    • Air turbine
    • Combustion
  19. De-icing and Anti-icing systems are intended to?
    Give pilot some options in situation where icing exists.
  20. When should a pilot activate the De-icing system?
    after about 1/2" of ice builds up, for maximum effectiveness.
  21. A pneumatic de-icing system us used to remove ice from where?
    ice that accumulated on the leading edge of a wing
  22. Premature aging is caused by?
    Ozone

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