Term
POWERPLANT TURBINE ENGINES
What are the two basic sections of a turbine engine? |
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Definition
| The hot section and the cold section. |
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Term
POWERPLANT TURBINE ENGINES
What are the two basic types of compressors that are used in aircraft turbine engines? |
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Definition
| Axial-flow and centrifugal. |
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Term
POWERPLANT TURBINE ENGINES
What is the purpose of the stators in an axial-flow compressor? |
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Definition
| The stators convert some velocity energy into pressure energy and change the direction of the air so it is proper for the next stage of rotors. |
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Term
POWERPLANT TURBINE ENGINES
What are three types of combustors used on aircraft turbine engines? |
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Definition
| Can-type, annular-type, and can-annular-type. |
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Term
POWERPLANT TURBINE ENGINES
How many igniters are there normally in an aircraft turbine engine? |
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Definition
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Term
POWERPLANT TURBINE ENGINES
What is the main purpose of the turbine nozzle in an aircraft turbine engine? |
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Definition
| The turbine nozzle directs the hot gases as they leave the combustors so they will turn the turbine wheel with maximum efficiency. |
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Term
POWERPLANT TURBINE ENGINES
What is meant by a free-turbine turboshaft engine? |
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Definition
| A turbine wheel or stage of wheels that is not used to drive the compressor, it drives the propeller in a turboprop or transmission & rotor in a chopper. |
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Term
POWERPLANT TURBINE ENGINES
Why do some axial-flow turbine engines have more than one set of turbines and compressors? |
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Definition
| A two-spool turbine engine has a low-pressure and a high-pressure compressor, each driven by its own turbine. The two independent systems operate at the speed at which they are most efficient. |
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Term
POWERPLANT TURBINE ENGINES
What kind of bearings are used to support the rotor shaft of an aircraft turbine engine? |
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Definition
| Anti-friction bearings, such as ball bearings or roller bearings. |
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Term
POWERPLANT TURBINE ENGINES
What is meant by a turbofan engine? |
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Definition
| An axial-flow 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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Term
POWERPLANT TURBINE ENGINES
Where can you find the limits of repair allowed for the compressor blades of an aircraft turbine engine? |
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Definition
| In the FAA-approved service manual issued by the manufacturer of the engine. |
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Term
POWERPLANT TURBINE ENGINES
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? |
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Definition
| If the engine is shut down while it is hot, there is a possibility that the shroud will contract around the turbine wheel and seize the rotor. |
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Term
POWERPLANT TURBINE ENGINES
What is meant by a hung start in a turbine engine? |
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Definition
| A start in which ignition occurs, but the engine does not accelerate to a self-sustaining speed. |
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Term
POWERPLANT TURBINE ENGINES
What is meant by a hot start in a turbine engine? |
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Definition
| A start in which ignition occurs, but the internal temperatures go high enough that they can damage the engine. |
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Term
POWERPLANT TURBINE ENGINES
What is meant by creep of the turbine blades? |
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Definition
| A condition of permanent elongation of the turbine blades. Creep is caused by the high temperatures and the high centrifugal loading imposed on the blades. |
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Term
POWERPLANT TURBINE ENGINES
How is the compressor of a turbine engine cleaned? |
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Definition
| An emulsion-type cleaner is sprayed through the engine while it is being motored by the starter or operated at a low speed. The wash is followed by a clean water rinse. |
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Term
POWERPLANT TURBINE ENGINES
Where is water injected into a turbine engine for cooling purposes? |
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Definition
| Into the compressor inlet and into the engine diffuser case. |
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Term
POWERPLANT TURBINE ENGINES
At what point in a turbine engine is the temperature the highest? |
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Definition
| At the inlet to the high-pressure turbine. |
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Term
POWERPLANT TURBINE ENGINES
What is the function of the interconnect tubes between the cans of a turbine engine that uses can-type combustors? |
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Definition
| These tubes allow the flame to travel from the cans that contain the igniters to all of the other cans when the engine is being started. |
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Term
POWERPLANT TURBINE ENGINES
What are two types of thrust reversers that are used on turbojet engines? |
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Definition
| The mechanical blockage-type and the aerodynamic blockage-type. |
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Term
POWERPLANT TURBINE ENGINES
What is meant by trimming a turbojet engine? |
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Definition
| Adjusting the fuel control to get the correct idling and maximum-thrust RPM. |
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