Revision For Walk Through Flashcards
What are the types of atomisers
Duplex
Rotary
Airspray
Vaporiser
What are the advantages of duplex
Better at high altitudes
Better at wide range of flows
How does a duplex work
Starts at low pressure as it builds the Pressure valve opens to allow the main fuel line will open
How does a rotary atomiser work
Fed through the shaft that has centrifugal motion that results in an atomised spray
Describe an Airspray nozzle
Combines fuel and air together
What are the advantages of an Airspray nozzle
Reduced carbon formation
Low pressure required so allows use of simpler pump
How does a vaporiser work
Fuel fed through the combustion chamber so is heated turning it into a vapour
What does a vaporised nozzle require
Requires a set of spray nozzle with igniter plugs to start combustion
How is stall identified
Audible rumbling
Loss of RPM
High jet pipe temperature
Vibration
What is the definition of Stall
A breakdown of airflow over one or more stages of the compressor
What is the definition of Surge
The event that occurs when the compressor delivery air pressure of less than the combustion pressure leading to the hot combustion gases flowing backwards through the compressor
What is the identification of Surge
Loud band of vary severity , with possible flames
Rise in JPT
Loss of RPM High jet
Extensive damage to the engine
What is the benefits of Annular system
Good utilisation of area
Structural part of the engine
Annular gas flow
Highly efficient
Large total combustion area
