place where air is expanded and accelerated rearward by the turbine, creating energy needed for reaction of the aircraft

Combustion section

an illustration or piece of equipment showing parts normally not visible when the covering sections are removed

Cutaway

the place where air is compressed as it passes along the axis of the engine rotating assembly

axial flow compressor

the air surrounding all sides of an engine

ambient air

place where fuel and air are mixed and then burned

Combustion chamber

a passage which becomes continuously smaller in the direction of flow

convergent duct

the part of the engine where air enters

air inlet section

the place where air enters and is compressed and accelerated in a perpendicular direction to the axis of the engine

Centrifugal flow compressor

a part of the engine that takes in a large mass of air, compresses it, and delivers it to the combustion section

compressor section

a jet engine having in its forward end a continuous inlet of air that depends on the speed of flight for the compressing effect produced on the air rather than by the use of a compressor

ramjet engine

the points of reference used to determine location, position, or movement of parts of an engine

directional references

a duct of varying cross-section used in discharging liquids or gases in which the velocity of the fluid is increased

nozzle

the action of driving forwardmatter the material a thing is made of

propulsion

a passage which becomes continuously larger in the direction of flow

Divergent duct

a part of the engine that collects and straightens the gas flow as it leaves the turbines, then accelerates the gases before they are discharged from the exhaust nozzle

exhaust section

a passage where the size of the duct remains the same

straight duct

a set of theoretical atmospheric conditions used as a reference in making technical order charts which are used for making engine adjustments and computing thrust

standard day

a propulsion system having a fan that is directly connected to and driven by a turbine and is used to supply air for cooling, ventilation, or combustion

turbofan engine

the forward force produced in reaction to escaping gases in jet propulsion

thrust

a propulsion system having a turbine-driven propeller designed to produce thrust principally by means of that propeller

turboprop engine

a propulsion system in which the power developed by a turbine is used to drive a compressor that supplies air to a burner and hot gases from the burner pass through the turbine and then to a rearward-directed thrust-producing exhaust nozzle

turbojet engine

the part of the engine that converts a portion of the heat energy of the exhaust gases into mechanical energy to drive the compressors and accessories

turbine section

changing to the position that streamlines the blades to the wind in case an engine must be shut off in flight

Feathering

a structure, piece, or body, shaped like a leaf in being wide and thin, designed to obtain a useful reaction upon itself in its motion through the air

airfoil

a device that converts fluid power into mechanical force or motion

actuator

a device used to ignite the pilot flame

flameholder

the component of a turbojet engine which transmits the power produced by the turbine wheels to the extension shaft assembly

Power section

a component that connects the power source to the reduction gear assembly

Extension shaft

to pull in

draw

the part of an engine that provides a means of attaching the propeller assembly to the propeller shaft while transmitting torque to the propeller blades

Barrel assembly

the part of an engine that provides additional thrust for short periods of time during takeoff and interception missions

Afterburner section

the first row of stationary blades in the axial flow compressor

Inlet guide vanes

a compressor with two spools

dual-spool

a part of a machine, shaped like a quarter of a circle

quadrant

the blades that are attached to the outer case of an axial flow compressor

Stator blades

an exhaust duct

tailpipe

a force that will produce rotation

torque

a drum

spool

the blades that are attached to the spool part of the compressor and increase the compression of the air at each stage and accelerate it rearward through several stages

Rotor blades

to the rear

rearward

the additional thrust provided by the afterburner section for short periods of time during takeoff and interception missions

Thrust augmentation

a compressor with one spool

single-spool

the component that allows the propeller shaft to be turned at a desirable speed and acts as an accessory mount

Reduction gear assembly

the thin, flat , or curved objects generally used for stationary airfoils within the engine

Vanes

to unite pieces of metal by heating until molten and fused until soft enough to hammer or press together

weld

a process by which air is removed from the system

bleed

a finned or vaned device for controlling the flow of air

louver

a chamber which consists of a housing and a liner; the liner consists of an undivided circular shroud extending all the way around the outside of the turbine shaft housing

Annular combustion chamber

a rotor; picks up and accelerates the air outwardly to the diffuser

impeller

branching outward in all directions from a common center

radial

a central line around which the parts of a thing, system, etc. are evenly spaced

axis

a stator; an annular chamber provided with a number of vanes forming a series of divergent passages into the manifold

diffuser

a chamber which consists of an outer case or housing, within which there is a perforated stainless steel combustion chamber liner or inner liner

Can combustion chamber

a small opening for the passage of fluid

port

a chamber which is a combination of the annular and can-type combustion chambers

can-annular combustion chamber

something that covers, screens, or guards

shroud

the technical name of an item

nomenclature

a formed edge, leg, lip, or rim; a narrow extension of a part that is formed at an angle to the main body of the part

flange

a detachable unit which consists of a fan inlet case and a low pressure compressor rotor and stator assembly

inlet fan module

accessory drive gear

ADG

compressor inlet variable vanes

CIVVs

a pipe fitting where fuel lines connect

fuel manifold

a divergent duct

diffuser case

a detachable unit which consists of the main gearbox assembly and the main oil pump assembly

gearbox module

a detachable unit with a specific function

module

a detachable unit which consists of a rear turbine case which contains a fan drive turbine rotor and stator assembly, a fan drive turbine shaft and a turbine exhaust case

fan drive turbine module

a cylindrical duct and liner combination extending from the aft end of a rear fan duct to the entrance of the nozzle

augmentor duct

a complete engine that consists of a high pressure compressor, a diffuser case with a combustion area, and a front turbine case with turbines

core engine

digital electronics engine control

DEEC

revolutions per minute

RPM

an element which consists of a shaft and a wheel; receives heated air from the stator element and takes this heat energy and converts it into mechanical energy to turn the high pressure turbine, which will turn the high pressure compressor

Rotor element

rear compressor variable vanes

RCVVs

the abbreviation for low rotor speed

N1

power takeoff

PTO

engine inlet total temperature

Tt2

an element which consists of an inner and outer shroud between which are fixed nozzle vanes; increases the velocity of heated air and directs the air onto the turbine rotors at the best angle

Stator element

the abbreviation for high rotor speed

N2