Induction and Engine Airflow Systems Flashcards
What happens to engine power when the carburetor heat is applied
There is a noticeable drop in power
What could happen if carburetor heat is applied at high engine power settings?
Detonation
Name the three components on the induction system of a reciprocating engine
air scoop, fuel control, and intake manifold
What could happen if the induction system becomes obstructed?
The engine may not be able to produce it’s rated power or may not run at all
What is the common method used to prevent induction system ice in a reciprocating engine?
Raise the temperature of induction air with a pre-heater
What causes fuel evaporation ice?
It is because of the decrease in air temperature resulting from evaporation of the fuel, after it is introduced into the airstream
How does induction icing affect engine performance?
It causes a reduction in power and possible erratic operation
How is induction icing categorized?
As impact ice, fuel evaporation ice, and throttle ice
Is carburetor, throttle ice, more likely to occur at a higher or lower power setting?
Lower - because the throttle is partly close offer in a larger surface area for ice accumulation
What may be the indication of leaking intake pipes?
The engine runs rough at low rpm
What are two types of supercharged induction systems?
Internally driven and externally driven
How and at what point does an internally driven supercharger boost air pressure?
An impeller compresses the fuel air mixture after leaving the carburetor
From where does an externally driven supercharger derive its power?
From the energy of engine exhaust gases, directed against some of the turbine
How and at what point does an internally driven supercharger, boost air pressure?
An engine driven impeller compresses fuel air mixture after it leaves the carburetor
What is used to power a turbo charger?
Engine exhaust gas directed into the turbo charger turbine
What is the function of a turbo charger wastegate?
It controls the volume of exhaust gas that is directed into the turbine
What could result if the wastegate on a turbo charger system does not close fully?
The engine may not be able to produce its rated power at certain altitudes, and the aircraft may not be capable of reaching critical altitude
What could cause a turbo charged engine to surge?
There could be a waste gate or controller malfunction
What are the most common ways to control a wastegate actuator power?
Either mechanically with linkages to the throttle, or a separate control, or by an actuator that is driven by oil pressure
What is used on turbocharged engines for wastegate actuator power?
Oil pressure
In a pressurized reciprocating aircraft, what component in the turbo charger system is used to limit the amount of turbo charger airflow use for cabin pressurization
The sonic Venturi
What is the function of a divergent shape jet engine inlet during subsonic flight?
He causes the air velocity to decrease with a subsequent increase in air pressure
Where are bellmouth Inlet ducts typically found?
Helicopter engines
What is the function of a sonic Venturi in a turbo charger system?
To limit the amount of turbo charger airflow used for cabin pressurization
How do Venturi type particle separator’s found on many turbine power helicopters function
A Venturi is used to accelerate the flow of incoming air and debris through a curved intake. Debris gains too much inertia to allow it to follow the curved intake towards the engine and its channel away from the compressor.
The Venturi type particle separator found on many turbine powered helicopters utilizes what characteristic of matter to help remove debris from the induction air?
Inertia
What are the most common methods used for anti-icing of turbine engine inlet ducts?
Engine bleed air and electric heating elements
What is an indication of a dirty air inlet filter?
Loss of power
Name two methods used for anti-icing of turbine engine inlet ducts
Engine bleed air and electrical heating elements
When is carburetor throttle ice most likely to form due to throttle position?
During part throttle operation when the throttle is in a partly closed position
