Induction And Airflow Systems Flashcards
What happen to engine power when the carburator heat is applied?
There is a noticeable drop in power.
What could happen if carburator heat is applied at high engine power settings?
Detonation.
Name the three components on the induction system of a reciprocating engine.
The air scoop, carburator or fuel control and intake manifold.
What could happen if the induction system becomes obstructed?
The engine may not be able to produce its rated power or it may not run at all. This may also be an indication of a dirty air inlet filter.
What is the common method used to prevent induction system ice in a reciprocating engine?
Raise the temperature of induction air with a preheater.
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 air stream.
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 carburator throttle ice more likely to occur at a higher or lower power setting? Why?
LOWER – The throttle is partly closed offering 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 leaves the carburator.
From where does an externally driven supercharger derive its power.
From the energy of engine exhaust gases directed against some form of turbine.
How and at what point does an internally driven supercharger boost air pressure?
An (engine-driven) impeller compresses the fuel/air mixture after it leaves the carburator.
What is used to power turbocharger?
Engine exhaust gas directed into the turbocharger turbine.
What is the function of a turbocharger waste gate?
It controls the VOLUME of exhaust gas that is directed onto the turbine.
What could result if the waste gate on a turbocharger 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 turbochargerd engine to surge?
There could be a waste gate or controller malfunction.
What are the most common ways to control a waste gate 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 many turbocharged engines for waste gate actuator power?
Oil pressure.
In a pressurized reciprocating aircraft, what component in the turbocharger system is used to limit the amount of turbocharger airflow used for cabin pressurization?
The sonic venturi.
What is the function of a divergent-shaped jet engine inlet during subsonic flight?
It causes the air velocity to decrease with a subsequent increase in air pressure.
Where are bellmounth inlet ducts typically found? (Key word bell)
On helicopter engines.
What is the function of a sonic venturi in a turbocharger system?
To limit the amount of turbocharger airflow used for cabin pressurization.
How do venturi-type particle separators, found on many turbine powered helicopters function?
A venturi is used to accelerate the flow of incoming air and debris through a curved intake. The debris gains too much inertia to allow it to follow the curved intake towards the engine and is channeled 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 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.
(1) Enginebleedair,(2)ElectricHeatingelements.
When is carburator throttle ice most likely to form due to throttle position?
During part throttle operation when the throttle is in a partly closed position.
