Engine cooling system Flashcards
What is the most common means of regulating the cooling airflow through a reciprocating engine
By the use of Cowl flaps
What is the purpose of the fence on 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 fins
The engine cowling and baffles are designed to force air through the cylinder cooling fins
Why is the “open and close” Adjustment during installation of Cowl flaps important
For each engine installation, the 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 limits
What should be done two cylinders went to much of the cooling fin area is broken off
Should be replaced because he cannot cool properly and a hotspot will develop
When should Cowl Flaps be kept in a fully open position
During all ground run operations
What publication should be referred to before pre-profiling Cylinder cooling fans
The manufactures service, or overhaul manual should be used to obtain the allowable limits
What power source are used to operate the cowl flaps
Electrical power, hydraulic power, manually
What is the purpose of blast tubes
To direct jets of cooling air to accessory’s of the engine that have high heat concentrations
What are the main reasons that excessive heat in reciprocating engine is undesirable
Excessive he shortens the life of the engine parts, impairs lubrication, and affects combustion
Describe the augmenter system
Used to help keep temperature of air cooled engines down by using exhaust gas Energy to draw cool air over the engines
What is the source of air directed to the engine bearings for cooling
Bleed air from the compressor section of the engine
What is the purpose of installation on an exhaust duct of a turbine engine
To reduce the temperature of the structures in the vicinity of the exhaust duct or afterburner, and to illuminate the possibility of fuel or oil coming into contact with a hot parts of the engine
What types of materials are used to make insulation blankets for turban engines
They are made of stainless steel, layers of aluminum foil, fiberglass, and silver foil
What area of turbine engine or cold by the secondary air passing through the engine
The combustion chamber and turbines
