Day 11 Progress Check Flashcards
How does an Engine Air-Inlet Vortex Destroyer solve the problem of suction vortices during ground operations?
Bleed air is used to destroy the jet stream
What is a disadvantage of acoustic linings?
Increased weight
What is the function of flaps in noise suppression?
Reduce exhaust area, increasing frequency
Why is the exhaust section of an aircraft engine vulnerable to cracking?
Repeated thermal cycling
What does a hot spot in the exhaust section of an engine indicate?
Faulty fuel nozzle
Where are acoustic linings located in an aircraft engine?
Between engine and cowling
What is the main solution to the problem of harmful Nitrogen Oxide (NOX) emissions in turbine engines?
Increased combustion efficiency
What is the primary motivation for the need for noise reduction in aircraft?
Operating near population centers
What component is responsible for converting acoustic energy into heat energy in the noise suppression system?
Acoustic linings
What is the purpose of noise suppressors in aircraft engines?
Augment the aircraft noise profile
How do low-frequency noises generated by jet efflux propagate compared to high-frequency noises?
Travel the farthest
How does the swirling motion in the TAPS combustor contribute to emission reduction?
Ensures a lean mixture of fuel and air
What does the Twin Annular, Pre-mixing Swirler (TAPS) combustor source air from?
High-pressure compressor
What is the purpose of the landing gear safety switch in the Engine Air-Inlet Vortex Destroyer?
Closes the valve on lift-off
How does the corrugated-type noise suppressor operate?
Breaking up the exhaust stream
