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21 Cards in this Set
- Front
- Back
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What are the two basic sections of a turbine engine? |
The hot and cold section |
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What are the two basic types of compressors that are used in aircraft turbine engines? |
Axial flow type or centrifugal |
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What are three types of combustors used in aircraft turbine engines? |
Can type, annular type, and can-annular type |
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What is the purpose of the stators in an axial flow compressor |
Converts velocity energy into pressure energy, and directs the air for the next stage rotor. |
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How many igniters are there normally on an aircraft turbine engine? |
2 |
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What is the main purpose of the turbine nozzle in an aircraft turbine engine? |
They direct the exhaust gases as they leave the combustors to turn the turbine wheel with maximum efficiency |
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What is meant by a free-turbine turboshaft engine? |
A turboshaft engine with a turbine wheel or a stage of turbine Wheels that are not used to drive the compressor of the gas generator section of the engine, it is instead used to drive propellers for turboprop engines or the transmission and rotor of helicopters |
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Why do some axial flow turbine engines have more than one set of turbines and compressors? |
To allow them operate independently at a speed at which they are most efficient |
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What kind of bearings are used to support the rotor shaft of an aircraft turbine engine? |
Ball or roller bearings and anti-fiction bearings |
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What is meant by a turbofan engine? |
An axial flow type turbine engine in which the first stage of compressor blades are lengthened so they can force air around the outside of the gas generator portion of the engine |
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Where can you find the limits of repair allowed for compressor blades of an aircraft turbine engine? |
In the FAA approved service manual issued by the manufacturer of the engine |
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Why is it important that a turbojet engine be allowed to cool before it is shut down after it has been operated at a high power setting? |
Because of the possibility that the shroud will contract around the turbine wheel and seize the rotor when shut down while it's still too hot |
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What is meant by hung start in a turbine engine? |
A start in which ignition occurs, but the engine does not accelerate to a self-sustaining speed |
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What is meant by a hot start in turbine engine? |
A start in which ignition occurs but the internal temperatures are just too high that could damage the engine |
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What is meant by creep of the turbine blades? |
A condition of a permanent elongation of the turbine blades due to high temperatures and centrifugal loads imposed on the blades |
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How is the compressor of a turbine engine cleaned? |
Using an emulsion-type cleaner It's sprayed into the engine while it's been motored with the starter or operated at a low speed. This is followed by water rinse. A cleaning is done by injecting mild abrasives such as ground up apricot beats or walnut shells into the engine while it's operating at Low speed |
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Where is water injected into a turbine engine for cooling purposes? |
Into the compressor inlet and the engine diffuser case |
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At what point in a turbine engine is the temperature the highest? |
At the inlet of the high-pressure turbine |
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What is the function of the interconnect tubes between the cans of a turbine engine that uses can-type combustors? |
It allows for the flame to travel and ignite all the other cans during the engine startup process. |
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What are two types of thrust reversers that are used on turbojet engines? |
Mechanical blockade type and aerodynamic blockade type |
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What is meant by trimming a turbo jet engine? |
Adjusting the fuel control to get the correct idling and maximum-thrust RPM |
