Jet Engines Engine Review Back to School – Spring Break is Over!

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Presentation transcript:

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 Understand Functions in the Jet Engine Basic SectionsUnderstand Functions in the Jet Engine Basic Sections Know Gas Turbine Engine Basic System PartsKnow Gas Turbine Engine Basic System Parts

Gas Turbine Engines

Jet Engines ã Suspicion at first ã Acceptance

How Jet Engines Operate ã Compared to reciprocating engines, the theoretical workings of the jet engine are simple.

Turbojet Engines ã Most widely used jet engine in the world ã Same basic operational sequence q Air enters through the intake section q Goes through the mechanical compressor q Forced into the combustion chamber, mixes with fuel, and burns q Escapes out through the exhaust nozzle = THRUST

Advantages of Turbine Engines  Vibration stress is relieved ã Engine is simpler  Cooling is less complicated Disadvantages of Turbine Engines  High fuel consumption - ramjet ã Poor performance at low-power setting, low speeds and low altitudes

Thrust ãPower of a jet engine is expressed in pounds of thrust Thrust = Weight of air x acceleration

How Jet Engines Operate

Turbojet Engines ã Parts of Turbojet Engines q Intake qCompressor qCombustion Chamber Compressor IntakeCombustor

How Jet Engines Operate Compressor

Turbojet Engines ã Parts of Turbojet Engines q Turbine Section q Exhaust Section qAfterburner qNozzle TurbineNozzle Augmentor

How Jet Engines Operate Turbine

How Jet Engines Operate

Summary Basic Engines Scientific Terms Reciprocating Engines Laws of Physics Jet Engines How Jet Engines Operate Types of Jet Engines Reversers and Suppressors

Ramjet Engines Turbo Fan Turbo Prop Turbo Shaft Types of Jet Engines

Ramjet Engines ã Simplest Jet Engine ãContains no moving parts ã Fuel is injected into the airstream and is ignited by a spark ã Will not function until enough air is coming through the intake to create a high- pressure flow ã Theoretically has no maximum speed Types of Jet Engines

Turbojet Engines ã Types of Turbojet Engines Centrifugal-Flow Engine Less efficient Axial-Flow Engine – simpler/ more efficient

Turbofan Engines ã Becoming the dominant engine ãFuel-efficient ã4X amount of Air pulled in

Turboprop Engines Combines the best features of turbojet and propeller aircraft Efficient at low altitudes and slow speeds

Example Turbo Prop T-56

T-56 Placard

T-56 used in P-3C and C-130

Turboshaft Engines ã For use in Helicopters

How Jet Engines Operate

12/airplane/turbparts.html

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 Turbine Engines - Summary