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Turbine Engines Flashcards

(20 cards)

1
Q

Explain the main difference and advantage of the turbofan over turbojet engines

A

A turbofan engine uses a fan to bypass some air around the engine core and to provide thrust. The advantage is that this provides additional thrust without fuel flow.

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2
Q

Name the major components in a gas turbine engine.

A

Air inlet, Compression Section, Combustion Section, Turbine Section, Exhaust Section, Gearbox and Accessory Section.

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3
Q

What determines the amount of airflow through a turbine engine?

A

The forward speed of the aircraft, compressor speed, and air density.

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4
Q

Name two types of compressors commonly used in turbine Engines.Fir

A

Axial and Centrifugal

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5
Q

Name two different methods for attaching turbine engine rotor blades to the rotor disk.

A

Dovetail, Bulb, and the FiR-Tree Type Root

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6
Q

What is a split compressor system?

A

Also called dual or twin spool compressors, these are connected to the turbine section, one inside the other.

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7
Q

What prevents the combustion chambers from burning?

A

Cooling air along the inside of the liner.

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8
Q

What is the purpose of interconnect tubes between can-type combustion chambers?

A

Flame propagation during start

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9
Q

What are carbon seals used for in turbine engines?

A

They are used as oil seals for the rotor shaft bearings.

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10
Q

What are the different types of combustion chambers used in turbine engines?

A

Can, annular, can-annular, and reverse flow annular.

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11
Q

What functions do axial flow turbine nozzles perform?

A

They direct the mass airflow to drive the turbine rotor at a specific angle.

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12
Q

How is thermal stress relieved on a turbine disc?

A

By directing bleed air onto the face of the disk, or by grooves being curt in the disk.

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13
Q

What is the purpose of turbine compressor field cleaning?

A

Remove contaminant deposits and improve performance.

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14
Q

What methods are commonly used to accomplish turbine engine compressor field cleaning?

A

Fluid flush and abrasive grit blast.

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15
Q

How can you tell if a turbofan or turbojet is out of trim?

A

There will be a high EGT, idle, and maximum power will be off.

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16
Q

Name types of compressors blade damage?

A

Dents, galling, pitting, cracks, scratches, burrs, burns, and gouges.

16
Q

What would the possible cause be for a turbojet or turbo fan engine having high exhaust gas temperature, low RPM, and high fuel flow at ALL engine pressure ration settings?

A

Possible turbine damage or loss of turbine efficiency.

16
Q

Used to mark hot and cold section parts?

A

Dye, felt tip marker, or chalk 4-26

17
Q

What is the effect or relative humidity on turbine power?

A

Negligible effect