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Jet Engines Engine Review. Back to School – Spring Break is Over!. Overview. Basic Engines Scientific Terms Reciprocating Engines Laws of Physics Jet Engines How Jet Engines Operate Types of Jet Engines Reversers and Suppressors. FLIGHT POWER. Objectives

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Jet engines engine review

Jet EnginesEngine Review

Back to School – Spring Break is Over!


Overview

Basic Engines

Scientific Terms

Reciprocating Engines

Laws of Physics

Jet Engines

How Jet Engines Operate

Types of Jet Engines

Reversers and Suppressors


FLIGHT POWER

  • Objectives

    • Understand Functions in the Jet Engine Basic Sections

    • Know Gas Turbine Engine Basic System Parts



Jet Engines

  • Suspicion at first

  • Acceptance


How Jet Engines Operate

  • Compared to reciprocating engines,

    the theoretical workings of the jet

    engine are simple.


  • Turbojet Engines

    • Most widely used jet engine in the world

    • Same basic operational sequence

    • Air enters through the intake section

    • Goes through the mechanical compressor

    • Forced into the combustion chamber, mixes with fuel, and burns

    • Escapes out through the exhaust nozzle = THRUST


  • Advantages of Turbine Engines

    • Vibration stress is relieved

    • Engine is simpler

    • Coolingis less complicated

    • Disadvantages of Turbine Engines

    • High fuel consumption

    • Poor performance at low-power

      setting, low speeds and low altitudes


Thrust

  • Power of a jet engine is expressed in pounds of thrust

Thrust = Weight of air x acceleration



  • Intake

  • Compressor

  • Combustion Chamber

Compressor

Intake

Combustor



  • Turbine Section

  • Exhaust Section

    • Afterburner

    • Nozzle

Turbine

Nozzle

Augmentor




Summary

Basic Engines

Scientific Terms

Reciprocating Engines

Laws of Physics

Jet Engines

How Jet Engines Operate

Types of Jet Engines

Reversers and Suppressors


Types of Jet Engines

  • Ramjet Engines

  • Turbo Fan

  • Turbo Prop

  • Turbo Shaft


Types of Jet Engines

  • Ramjet Engines

    • Simplest Jet Engine

    • Contains no moving parts

    • Fuel is injected into the airstream and is

      ignited by a spark

    • Will not function until enough air is

      coming through the intake to create a high-

      pressure flow

    • Theoretically has no maximum speed


Axial-Flow Engine

Centrifugal-Flow Engine


  • Turbofan Engines

    • Becoming the dominant engine

    • Fuel-efficient

    • 4X amount of Air pulled in


  • Turboprop Engines

    • Combines the best features of

    • turbojet and propeller aircraft

    • Efficient at low altitudes and slow speeds




How Jet Engines Operate

http://www.grc.nasa.gov/WWW/K-12/airplane/turbparts.html


Turbine Engines - Summary

  • Uses the force of hot flowing gases

    striking a turbine to produce thrust

    Know the four basic types

    Know the parts

    Know what and afterburner is:

    fuel injected into exhaust under

    pressure – velocity increased


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