Module 5 Flashcards
What are compressors designed to do?
Increase Pressure from the inlet duct and direct it through the combustion chamber via the diffuser
How is compressor effectiveness measured?
Measured as a ratio of the Static Pressure at the output vs that of the input
Types of compressors
Centrifugal, Axial, Combination
______________: Are used on turbo-prop and turbo-shaft engines
With a compression ratio of 10-15:1
Centrifugal Flow
_______________: Compression Ratio is 40:1, Series of stages, with Rotors and stators
Axial Flow Compressors
What is used to direct air into the first stage rotor at the correct angle?
IGV(Inlet Guide Vanes)
Which device straightens out the airflow prior to entering the diffuser?
Exit Guide Vanes
Differential Pressure between the rotors and stators results in a pumping action caused by the rotors and stators, this is called ___________
Cascade Effect
What happens when the Compressor blade AoA exceeds the critical AoA
Compressor Stall
________________ can cause substantial damage to the engine
Compressor Surges
What can cause Compressor stalls and surges
Turbulent or disrupted airflow to the engine
Rapid Engine Acceleration/Deceleration
Contaminated or Damaged Compressors
Damage to Turbine components, causing loss of power to compressor
What can prevent compressor stalls/surges
VIGV and stators
Compressor Control Bleed Valves
Compressor Wash
What are the different types of Compressor Rotor blade roots?
Bulb-Type, Fir Tree, Dovetail (Prevents Radial Movement)
What prevents Axial movement on Compressor blades?
Pins, Lock Tabs, Locking wires, Rivets, Screws
Compressor Blade assembly and disc are made in a single assembly called _______
Blisk
What helps import even acceleration of airflow to all parts?
Blade Twist
___________: Reduces thickness of blades towards the tip in order to reduce vibration
Blade Profiling
Some compressor blades increase the curve between the blade root to the tip
Blade Camber
When replacing a blade, what must you also do?
Replace the blade 180 degrees opposite from it
What can compressor bleed air supply?
Cabin Pressurization
Anti ICe
Pneumatic Starting
Engine active clearance control
