18 Questions
What component controls the pump output in an engine?
Pressure ratio control unit
How does the pressure ratio control unit restore balance in an engine?
By adjusting the exhaust nozzle pump output
What happens to the nozzle area when the gas load on the nozzle flaps increases?
Nozzle area opens up
In the context of engine operation, what does the AB fuel control unit do?
Schedules an increase in fuel pump output
How does an out-of-balance condition between hydraulic actuators and gas loads affect the nozzle flaps?
Opens the nozzle flaps
What is the purpose of the pressure ratio control unit in engine operation?
To maintain the P3 / P6 ratio
What is the purpose of corrugations in an AB duct?
To dampen the vibrations
Which component is responsible for controlling the rapidly expanding gas during AB operation?
Variable Area Nozzle
What type of nozzle system consists of concave flaps or eyelids that are fully closed for normal engine operation and fully open for AB operation?
Two Position Nozzle
In the context of AB ducts, what do holes primarily allow into the duct?
Cooling air
Which component is essential for engine power control during AB operation?
Variable Area Nozzle
What is the main function of a screech liner in an AB system?
Absorb pressure fluctuations
What happens if the nozzle opens when AB is not selected?
The engine will over-speed
In the context of the text, what is the purpose of a fail-safe system in an afterburner?
To shut down the afterburner and close the nozzles in case of a fault
What is the role of the engine pressure ratio control unit in relation to afterburner operation?
To ensure correct coordination between fuel flow and nozzle area for effective operation
How does the afterburner fuel control unit respond when the throttle is advanced into the afterburner range?
It determines the amount of fuel delivered to the afterburner manifolds
What component alters the pressure ratio across the engine during afterburner operation?
Pressure ratio control unit
What term is used in the text to refer to the pressure in the exhaust duct during afterburner operation?
P6
Learn about the operation of afterburners and safety measures to prevent engine damage. Understand the importance of fail-safe systems in afterburners to ensure normal engine operation.
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