Reciprocating Engine Induction And Cooling System Flashcards
The basic induction system of an aircraft reciprocating engine consist of what component
Air scoop used to collect the inlet air and ducting that transfer the air to the inlet filter
What are the three major parts of a reciprocating engine induction system?
Air scoop, fuel delivery system, and intake manifold
What effect does the induction system icing have on engine performance?
Engine acting erratically, lose power, and possibly quit
What method is used to prevent or remove induction system ice in a reciprocating engine
Heated air
How is ice cleared in some aircraft induction system if the carbureto heat is too low to clear the ice
Alcohol is sprayed into the induction system ahead of the carburetor, the fluid will dislodged ice, which is ingested by the engine
What engine indication can be the result of a dirty air filter?
low power
What is the danger of using carburetor heat when operating a higher power setting?
Detonation and possible engine failure
Carburetor throttle ice is most likely to form with the throttle is in which position
Partially close position
What are the two general classification of superchargers used in a reciprocating engine induction system?
Internally driven or externally, driven supercharger system
What is the purpose of distribution impeller in a radial engine?
To break up the fuel globules into a finer particles for better distribution to the cylinder
How does a internal driven supercharger get its power?
Mechanically engine driven. High speed impeller is driven through a gear train from the crankshaft.
Where does externally driven supercharger get its power
By the exhaust gases that are directed against the turbine, also known as turbochargers
What unit regulates the amount of exhaust gases to the turbine of a turbocharger?
A waste gate
What type of powered is used to control the position of the Turbocharger waste gate on some engines?
Oil pressure to an actuating piston
What can cause waste gate to stick
Build up of carbon deposits
What are the most common ways to control a waste gate?
Mechanical linkage to throttle or separate control, or by an actuator that is driven by the oil pressure.
What causes fuel evaporation ice?
Decrease in air temperature resulting evaporation of fuel after it is introduced into the airstream
What is the function of a Turbocharger waste gate?
Controls the volume of exhaust gas that is directed onto the turbine
What may be the indication of leaking intake pipe?
Engine running rough
What may be the indication of a turbo charger Waste gate will not close fully
Aircraft may not be able to reach critical altitude
What could be the probable cause of a turbocharger engine that surges
Waste gate or controller malfunction
What is used on many Turbocharger Engines for waste gate actuator power
Oil pressure
How does divergent shape jet engine inlet affect, air flowing to the engine when the airplane is in subsonic flight?
Cause the air velocity to decrease and air pressure increase
Bellmouth inlet ducts are used typically on what type of aircraft
Helicopter
venturi type particle separator, found on many turbine powered helicopters, utilizes what characteristics of matter to help remove debris from induction air
Inertia
What is the most common means of regulating the cooling air flow through a reciprocating engine?
Using cowl flaps
what is the purpose of the fins on the engine cylinders?
To increase the surface area of the cylinder for cooling
What other engine characteristics are designed to aid in engine cooling besides cooling fin
Baffles and engine cowling
How is an engine designed to provide more cooling area?
The outer surface of the cylinder is increased by using cooling fins
Why is the open and close adjustment during installation of cowl flaps important
Cowl flaps are set for a tolerance that will permit them to open and close in the correct amount to keep the cylinder head temperature within allowable limit
What should be done to the cylinder when much of the cooling fins are broken off
Should be replaced because it cannot cool properly and hotspot would develop
When should clow flap be kept in fully open position
During ground operation
What power source are used to operate the cowl flaps
Electrical power, hydraulic power, or manually
What is the purpose of a blast tubes
To direct jetS of cooling air to accessories of engine that have high heat concentrations. On radial engine they duct air onto the spark, plug elbows of each cylinder to prevent overheating of ignition leads
what are the main reasons that excessive heat in a reciprocating engine is undesirable
 Shorten the life of engine parts, impairs lubrication, and affect combustion
Describe the augmentor system
It is used to keep the temperature of air cooled engines down by using exhaust gas energy to draw cool air over the engine
What is the source of air directed to the engine bearings for cooling?
Bleed air from the compressor section
What is the purpose of insulation on the exhaust duct of a turbine engine?
To reduce the temperature of the structure in the vicinity of the exhaust duct or afterburner and to fuel oil coming in contact with the hot part of the engine
What type of materials are used to make insulation blanket for a turbine engine?
Stainless steel, layers of aluminum foil, fiberglass, and silver foil
What areas of a turbine engine are cool by the secondary air passing through the engine
 Combustion chamber and the turbines
What is the purpose of a engine cowling?
it streamlines the engine to reduce drag and forms an envelope around the engine, which force is the airstream between the cylinders to cool them
What is the purpose of a oil cooler bypass valve?
 Allows the thick oil to bypass the cooler when the oil is cold
Where should a cowl flap be position during ground operation?
Fully opened
What is the purpose of cowl flap air seal
They forced air to circulate around and through the baffle system
Where must most cooling air flow to cool a turbine engine
 Through inside of the engine
What areas of turbine engines are cool by air passing through the engine
The combustion chamber and turbine
What is the relationship between turbine engine upper temperature limit and the power produced
The Higher combustion temperature that an engine could withstand without damage ,the more power is capable of producing
What is the approximate percentage open air passing through a turbine engine that is used for cooling rather than combustion
75%
