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19 Cards in this Set
- Front
- Back
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What are the major components of a typical gas turbine engine? |
Air inlet, compression section, combustion section, turbine section, exhaust section and accessory section. |
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What are the two principle types of compressors used in turbojet aircraft? |
Centrifugal flow and axial flow types. |
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What are the four types of combustion chamber systems. |
Can type, Can-annular type, Annular type and reverse flow annular. |
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What is the purpose of the interconnector tubes between can type combustion chambers? |
Spread the flame to the combustion chambers that are not equipped with igniter plugs during engine starting. |
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What prevents burning of the liner walls in can type combustion chambers? |
Louvers direct a cooling layer of air along the inside wall of the liner. |
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What types of damage may be found when inspecting compressor blades? |
Dents, Scratches, Gouges, Galling, Burns, Burrs, Pitting, and cracks. |
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What is the location and function of the diffuser section in a turbine engine? |
Located between the compressor section and burner cans. Its function is to change the high velocity compressor discharge air to static pressure. |
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Where are the stress rupture cracks most likely o occur on turbine blades? |
Across the leading or trailing edge of the blades. The cracks appear at right angles to the edge length. |
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How are compressor blades attached to a disk-type rotor? |
The compressor blades are fitted into the disks by either bulb-type or fir=tree type roots. The blades are then locked by means of screws, peening, locking wires, pins or keys. |
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What is the purpose of the nozzle diaphragm or turbine nozzle? |
The turbine nozzle prepares the combustion mass airflow to drive the turbine rotor. First purpose is to change a portion of the heat and pressure energy to velocity energy. Second purpose of the turbine nozzle is to deflect the gases so they strike the turbine at the most efficient angle for maximum rotation. |
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What is the major difference between a turboprop and a turbojet engine? |
Turboprop usually has more stages and also must drive a propeller. |
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What is a turbofan engine? |
Same concept as turboprop except that the propeller is replaced by a duct-enclosed axial flow fan. |
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What is the effect of air density on the thrust of a turbine engine? |
If density increases, thrust increases, and visa versa. |
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What are two most common types of thrust reverse? |
Mechanical blockage type and aerodynamic blockage type. |
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What is a split compressor system in a turbine engine? |
Requires two concentric shafts joining the turbine stages to their respective compressor. |
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What is one method of relieving thermal stress on a turbine disk? |
Direct bleed cooling air back onto the face of the disk. |
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What may be the indications if a turbojet engine is out of trim? |
High exhaust gas temperature for takeoff. |
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What is a free turbine? |
Drives a propeller or helicopter transmission. |
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What is the main purpose of thrust reversers? |
For slowing the aircraft down to effective braking speeds. |
