FLIGHT POWERKnow basic engine principles.

1. Define a list of terms related to basic engine principles.

2. Describe the various types and components of jet engines

3. Describe the role of reversers and suppressors used in jet aircraft.

Jet Engines• Suspicion at first• No visible propeller•Ability to operate in poor weather

• Acceptance came with greater performance and demonstrated reliability

• Compared to reciprocating engines, the theoretical workings of the jet engine are simple.• Despite the similarities there are two major differences.• Jet engines do not have a propeller to generate thrust• The exhaust in the reciprocating engine is mainly wasted, but the jet engine’s exhaust serves as the thrust

How Jet Engines Operate

• A jet engine operates on the principles outlined in Newton’s Second and Third Laws of Motion:• Second Law: Force is equal to mass times

acceleration (F = M x A).• Third Law: For every action there is a

reaction of equal force in the opposite direction.

How Jet Engines Operate

Types of Jet Engines Ramjet Engines• Contains no moving parts• Fuel is injected into the airstream

and is ignited by a spark• Needs air is coming through the

intake to create a high-pressure flow

• In theory, the ramjet engine has no maximum speed; it can keep accelerating indefinitely as long as it stays within the atmosphere.

• The biggest drawback of the ramjet is its high rate of fuel consumption.

Types of Jet Engines Turbine Engines•Uses the force of hot flowing gases striking a turbine to produce thrust •Some are geared to propellers similar to the types of propellers used with reciprocating engines•Widespread use as the source of power for helicopters

Types of Jet Engines Turbojet Engines•Early jet design•Air enters through the intake section, passing through the mechanical compressor and into the combustion chamber•Mixes with fuel, burns and escapes through the exhaust nozzle as THRUST

Parts of a Turbojet Engine

Types of Jet Engines Turbofan Engines•Most widely used jet engine in the world today•Quieter and more fuel efficient than turbojet engines•Four times more air is pulled into a turbofan engine when compared to a turbojet providing additional thrust, yet due to the various stages of compressor fans, turbofan engines actually use less fuel than turbojets

Parts of a Turbofan Engine

Types of Jet Engines Turboprop Engines•Combines the best feature of turbojet and propeller aircraft•Almost all of the thrust comes from the propeller•More fuel efficient and provides a higher level of power than reciprocating engines

Reversers and Suppressors Reversers•Reversing the direction of the engines thrust to slow aircraft speed

Suppressors•Reduces high frequency of jet exhaust through breaking a large exhaust stream into numerous smaller exhaust streams

FLIGHT POWERUnderstand basic engine principles.

1. Define a list of terms related to basic engine principles.

2. Describe the various types and components of jet engines

3. Describe the role of reversers and suppressors used in jet aircraft.