Basic Mechanics Flashcards
Principles of JET operation
For every force acting on a body there is equal and opposite reaction
For aircraft propulsion, the “body” is atmospheric air that is caused to accelerate as it passes through the engine. The force required to give this acceleration has an ___________ in the ___________ acting through the engine and airframe.
*Equal effect
*Opposite direction
What is the earliest known example of JET REACTION
HERO’S ENGINE
ATHODYD
Aero-Thermo Dynamic Duct
When forward motion is imparted to it from an external source,air is forced into the air intake where it loses velocity and increases its pressure as it passes through the divergent duct.The total energy is increased by the :
Combustion of fuel
What are several types of jet engines:
Rocket
Ram jet (ATHODYD)
Pulse jet
Turbo jet/Gas turbine engine
Turbo shaft
The energy and momentum given to the air, forces it out of the propelling nozzle at high velocity.on it way through the engine the air gives up some of it energy and momentum to drive:
The turbine that powers the compressor.
Two main rotating parts
Compressor
Turbine
Engine installations vary depending on the type and number of separate compressors of power shafts that need to be driven. List the three different configurations:
Single spool
Multi spool
By pass
Drive path configuration can be provided in two separate ways:
a).Direct Couple turbo-shaft
b).Free Power Turbine
Propeller efficiency will decrease rapidly above__________. Due to the disturbance of the air flow caused by high blade tip speeds of the propeller.
350 MPH
Jet propulsion is a practical application of Newton’s Third law of motion which states:
For every force acting on a body there is equal and opposite reaction.
Thermal Efficiency
The heat value or heat energy output of the engine, divided by the heat energy input (fuel consumed)
Thermal efficiency ________ as the turbine inlet temperature ________.
Increases
At low Turbine inlet temperature, the expansion energy of the gases is too low for efficient operation. As the temperature increased, the gases become more ____________ and the themal functions are performed at a rate that suits the _________.
-Energetic
-Engine design
