Aircraft Icing and Fuel Injection Systems Quiz
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Questions and Answers

What is responsible for ensuring the same fuel input to each cylinder in a diesel engine?

  • O'ring
  • Nozzle body
  • Calibrated jet orifice (correct)
  • Bleed ports
  • Which component allows air to enter when fuel passes through the calibrated jet orifice in a diesel engine?

  • Nozzle body
  • O'ring
  • Calibrated jet orifice
  • Bleed ports (correct)
  • What is the preferred method of fuel delivery to cylinders in diesel engines?

  • Storage manifold
  • Piezoelectric actuators
  • Traditional distributor injection pump
  • 'Common rail' (correct)
  • What high-pressure does the single pump in common rail systems deliver fuel at?

    <p>2000 bar</p> Signup and view all the answers

    In electronic/computer-controlled systems like FADEC, what activates each injector valve based on demand?

    <p>Solenoid</p> Signup and view all the answers

    What is NOT a disadvantage of common rail injection compared to traditional distributor injection pumps?

    <p>'Common Rail' maintaining high-pressure fuel supply</p> Signup and view all the answers

    How does the fuel reach the engine-mounted delivery system in light aircraft?

    <p>Gravity and ram air push</p> Signup and view all the answers

    'Common Rail' systems distribute high-pressure fuel to what component in diesel engines?

    <p>'Injector valves'</p> Signup and view all the answers

    'Piezoelectric actuators' are used to activate what in modern diesel engines?

    <p>'Nozzles'</p> Signup and view all the answers

    'Water traps' are part of which component in the traditional aircraft fuel supply system?

    <p>'Selector valve'</p> Signup and view all the answers

    Study Notes

    Fuel Injection Systems

    • Impact icing occurs when ice forms on the exterior of the aircraft and blocks openings, such as the air intake for the injection system.
    • Advantages of using fuel injection include:
      • Reduction in evaporative icing
      • Better fuel flow
      • Faster throttle response
      • Precise control of mixture
      • Better fuel distribution
      • Easier cold weather starts
    • Disadvantages of using fuel injection include:
      • Difficulty in starting a hot engine
      • Vapor locks during ground operations on hot days
      • Problems associated with restarting an engine that quits due to fuel starvation

    Indirect Fuel Injection

    • Key components include:
      • Fuel pump
      • Fuel/air control unit
      • Fuel manifold valve
      • Discharge nozzles for each cylinder
      • Throttle valve regulates airflow
      • Fuel pressure gauge allows for mixture adjustments
    • Indirect fuel injection is commonly used in aircraft piston engines, typically of the low-pressure, continuous-flow type.
    • Fuel is continuously sprayed into the induction pipe near the inlet valve.
    • Advantages of this method include:
      • Low operating pressure
      • Even fuel distribution
      • Freedom from icing issues

    System Components

    • Fuel pumps deliver more fuel than the engine needs, with a recirculation path available.
    • Two pumps are installed in parallel.
    • The electrical pump can be used for priming, starting the engine, and in emergencies.
    • The throttle valve regulates airflow.
    • The fuel pressure gauge allows for mixture adjustments.

    Diesel Engines

    • Fuel supply system for aircraft storage is similar to traditional aircraft.
    • Fuel is primarily stored in wing tanks.
    • Fuel delivery to the cylinders can be done in various ways, but the preferred method is called 'common rail'.
    • Common rail system maintains high-pressure fuel supply (about 1800 bar or 26,000 psi) near the cylinders.

    Electronic/ Common Rail Injection

    • Common rail systems replace the traditional distributor injection pump with a single, very high-pressure pump (about 2000 bar or 29,000 psi).
    • High-pressure fuel is distributed to computer-controlled injector valves.
    • Each injector valve is activated by either a solenoid or piezoelectric actuators.

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    Description

    Test your knowledge on impact icing and fuel injection systems in aircraft. Learn about the advantages and disadvantages of using fuel injection for better performance and efficiency.

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