Engine cooling: Recip and Turbine Flashcards
Two types of systems used to remove excess heat from an aircraft engine are:
__________
__________
Air cooling
Liquid cooling
The area which heat can be dissipated from a cylinder is increased by __________ that are cast or machined into the surface
fins
Three components of an air-cooled engine installation must work together for most efficient cooling.
__________
__________
__________
Fins
Cowling
Baffles
The cylinder head of most air cooled engines is made of ___________
Cast aluminum aloy
The cylinder barrels of the Wright turbocompound engine disipated heat from the cylinder barrel through a finned muff made of __________ that were shrunk around the steel cylinder barrel
Aluminum alloy
The most popular type of cowling for radial engines is the __________ cowling
NACA
The amount of air flowing through an NACA cowling is controlled by adjustable __________ over the air exit gap
Cowl flaps
For all ground operations, the Cowell flaps should be fully __________
Open
The type of cooling used boost modern air-cooled horizontally opposed engines is __________ cooling
Pressure
The cowling for a horizontally opposed engine is devided into two compartments by ___________
Baffles
Air is forced to flow through the cylinder fins by close fitting shrouds and ___________ baffles
Intercylinder
Air is prevented from leaking past the baffles by a flexible seal made of __________
Rubber
The pressure of the air below the engine in a pressure cowling is controlled by the __________
Cowl flaps
Opening the cowl flaps in flight __________ the air pressure below the engine.
Decreases
An augmented tube increases the flow of cooling through the engine cylinder fins because of low pressure caused by the high velocity___________ gases that flow through the tube
Exhaust
The coolant used in modern liquid cooled engines is __________
Ethylene Glycol
The pistons and cylinder barrels of a TCM Voyager engine are cooled with __________
Oil
Burned paint on a cylinder can be an indication of _________
Preignition
The rubber sealing strip on the vertical baffles on a horizontally opposed engine installation should fold _________
Foward
Small cracks in a cylinder head fin can be prevented from continuing by ___________ the end of the crack
Stop drilling
The maximum amount of fin area that can be removed from a cylinder is specified in the engine __________
Service manual
Bent cast aluminum cylinder head fins ___________(should/should not) be straightened
Should not
About 75% of the air that passes through a gas turbine engine is used for ___________
Cooling
The burning gases inside the combustors are prevented from contact with the metal by a film of ___________
Air
The hottest point in a gas turbine engine is found at the ___________
Turbine inlet guide vains
The turbine blades in some high-performance turbine engines are hollow and are cooled by a flow of ___________
Compressor air
