Block 1 Flashcards
What do all HEAT engines have in common?
The ability to convert fuel (chemical energy) into heat energy, and then into mechanical energy.
Turbojet:
Means of Compression:
Engine Working Fluid:
Propulsive Working Fluid:
Means of Compression:
Turbine Driven
Engine Working Fluid:
Fuel/Air Mixture
Propulsive Working Fluid:
Fuel/Air Mixture
Turbo Prop :
Means of Compression:
Engine Working Fluid:
Propulsive Working Fluid:
Means of Compression:
Turbine Driven
Engine Working Fluid:
Fuel/Air Mixture
Propulsive Working Fluid:
Ambient Air
Ram Jet:
Means of Compression:
Engine Working Fluid:
Propulsive Working Fluid:
Means of Compression:
Ram Compression due to High Flight Speed
Engine Working Fluid:
Fuel/Air Mixture
Propulsive Working Fluid:
Fuel/Air Mixture
Pulse-Jet
Means of Compression:
Engine Working Fluid:
Propulsive Working Fluid:
Means of Compression:
Compression due to Combustion
Engine Working Fluid:
Fuel/Air Mixture
Propulsive Working Fluid:
Fuel/Air Mixture
Reciprocating Engine:
Means of Compression:
Engine Working Fluid:
Propulsive Working Fluid:
Means of Compression:
Reciprocating action of Engine
Engine Working Fluid:
Fuel/Air Mixture
Propulsive Working Fluid:
Ambient Air
Rocket:
Means of Compression:
Engine Working Fluid:
Propulsive Working Fluid:
Means of Compression:
Compression Due TO Combustion
Engine Working Fluid:
Oxidizer/Fuel Mixture
Propulsive Working Fluid:
Same as. Engine Working Fluid
Requirements for all engines:
REE
Reliability
Efficiency
Economy
What is the useful output in all aircraft powerplants?
Thrust: which propels the aircraft forward.
What is THP
Thrust Horsepower
What is durability?
Amount of engine life obtained while maintaining desired amount of reliability.
What is operating flexibility?
The ability of an engine to run smoothly and give desired performance at all speeds from idling to full power output.
Types of Reciprocating Engines: (4)
In-Line
V-Type
Opposed
Radial
Basic parts of reciprocating engines: (7)
CCCCVVP
Crank Case Cylinders Connecting Rods Crank Shaft Valves Valve-operating mechanism Pistons
Parts of a Crank Shaft: (5)
Crankpin CrankCheek Counterweight Dampening Weights Journal
When is a crankshaft statically balanced?
When the weight of the entire assembly of crankpins, crank cheeks, and counterweights is balanced around the axis of rotation.
When is a crankshaft dynamically balanced?
When all of the forces created by crankshaft rotation and power impulses are balanced within themselves so little to no vibration is produced while engine is operating.
What is a crank cheek?
Crank cheek connects crank pin to the main journal.
What is a connecting rod?
The link that transmits forces between the piston and crankshaft.
What do piston rings do?
Prevent leakage of gas pressure from combustion chamber and reduce to a minimum of seepage of oil into the combustion chamber.
What is another name for piston pin?
Wrist Pin
What does a piston pin used for?
Joins the piston to the connecting rod.
What type of piston pin do modern engines have?
Full-Floating Type
What does the compression ring do?
Prevents the escape of gas past the piston during engine operation
What do oil control rings do?
Regulate the thickness of the oil film on the cylinder wall.
Describe an oil scraper ring
Beveled Face
Installed in a groove at the bottom of piston skirt
Scraping edge is away from piston head
Where is power developed in an engine?
Cylinders
Parts of a Cylinder:
CCSPIF
Cast aluminum Head Connecting Rods Intake Valve Spark Plugs Piston Forged Steel Barrel
What is the purpose of cylinder heads?
To provide a place for combustion of fuel/air mixture and to give cylinder more heat conductivity for cooling.
What are cylinder barrels made of typically?
Steel
When steel soaks up nitrogen from the gas and forms iron nitrides in the exposed surface it’s called.
Nitrided
Cylinders worn and out of round can be groudn out to make them round again and re-nitrided OR
chrome plated
Propeller shaft is always the ______ end. The acecssory end of the engine is the ______ end. Regardless of engine mounting.
Front
Rear
Which valve operates at lower temperatures.
Intake or Exhaust
Intake
