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23 Cards in this Set
- Front
- Back
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What are the two basic sections of a turbine engine?
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Hot and cold sections
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What are the two basic types of compressors that are used in aircraft turbine engines?
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Axial-flow and centrifugal
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What is the purpose of the stators in an axial flow compressor?
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Convert 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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What are three types of combustors used on aircraft turbine engines
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Can type, annular type, and can-annular type
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How many igniters are there normally in an aircraft turbine engine?
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Two
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What is the main purpose of the turbine nozzle in an aircraft turbine engine
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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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What is meant by a free-turbine turbo shaft engine?
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A turboshaft engine that has a turbine wheel or stage of turbine wheels, that is not used to drive the compressor of the gas generator section of the engine. This free turbine drives the propeller in a turboprop engine or the transmission and rotor of a helicopter
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Why do some axial flow turbine engines have more than one set of turbines and compressors
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A two spool turbine engine has a low-pressure and a high pressure compressor, each driven by it's own turbine. The two independent systems operate at the speed 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
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Anti-friction bearings such as ball bearings or roller bearings
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What is meant by a turbofan engine
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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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Where can you find the limits of repair allowed for the compressor blades of an aircraft turbine engine
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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 had been operated at a high power setting?
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If the engine is shut down while it's hot there is a possibility that the shroud will contact around the turbine wheel and seize the rotor
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What is meant by a hung start in a turbine engine
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A start in which the 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 a turbine engine?
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A start in which ignition occurs but the internal temperatures go high enough that they can damage the engine
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What is meant by creep of turbine blades
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A condition of permanent elongation of turbine blades. Creep is caused by high temperatures and high centrifugal loading imposed on the blades
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How is the compressor if a turbine engine cleaned?
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An emulsion-type cleaner sprayed through the engine while it is being motored by the starter or operated at a low speed. The wash followed by a clean water rinse.
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What is meant by creep of turbine blades
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A condition of permanent elongation of turbine blades. Creep is caused by high temperatures and high centrifugal loading imposed on the blades
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How is the compressor if a turbine engine cleaned?
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An emulsion-type cleaner sprayed through the engine while it is being motored by the starter or operated at a low speed. The wash followed by a clean water rinse.
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Where is water injected into a turbine engine for cooling purposes?
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Into the compressor inlet and into the engine diffuser case
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At what point in a turbine engine is the temperature at it's highest
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At the inlet to 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?
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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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What are two types of thrust reversers that are used on turbojet engines
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Mechanical blockage type and the aerodynamic blockage type
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What is meant by trimming a turbojet engine
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Adjusting the fuel control to get the correct idling and maximum thrust rpm
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