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Turbines 2 > Exam Review 1 > Flashcards

Exam Review 1 Flashcards

1
Q

Type of Duct: -Velocity of air decreases -Expands in Diameter -Static pressure increases -Temp of air increases

A

Divergent Duct

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2
Q

In turbine engine, what is a common term applied to a divergent duct?

A

Diffuser

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3
Q

Type of Duct:

Increase Velocity of air

Decrease diameter

Decrease static pressure

Temperature of air decreases

A

Convergent Duct

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4
Q

Which component on a turbine eng is typically a Convergent duct?

A

Exhaust Nozzle

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5
Q

‘The sum of the static and dynamic pressures will always be equal’

A

Bernoulli’s Principle

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6
Q

Define Bernoulli’s Principle:

A

The SUM of (total pressures added) of the DYNAMIC & STATIC PRESSURES will always be equal

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7
Q

Often referred to as CONSTANT PRESSURE CYCLE

In a Turbine eng 4 events to support combustion occur constantly & simultaneously:
They are: –> Intake –> Compression –> Ignition/Power –> Exhaust.

A

Brayton Cycle

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8
Q

When do these 4 cycles occur?

A

Separately

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9
Q

How many degrees of crankshaft rotation are needed for all 4 events (cycles) to occur?

A

720 degrees

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10
Q

When must ignition occur?

A

every 720 degrees at ignition cycle

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11
Q

When does ignition normally occur during
Turbine engine operation??

A

At engine start-up

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12
Q

Typically a Spool or Rotor is defined as a single rotating unit with a compressor and turbine attached at ____ _____ of a shaft.

A

opposite ends

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13
Q

In ‘2 spool’ engine what is N1?

A

Low pressure compressor———–Low pressure turbine

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14
Q

In ‘2 spool’ engine what is N2?

A

High pressure compressor————High pressure turbine

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15
Q

In ‘3 spool’ engine what is N1?

A

Low pressure compressor——-Low pressure

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16
Q

In ‘3 spool’ engine what is N2?

A

Intermediate pressure rotor—–intermediate pressure turbine

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17
Q

In ‘3 spool’ engine what is N3?

A

High pressure compressor———High pressure turbine

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18
Q

It measures engine thrust output by comparing the pressure at the front to the pressure back of the engine.

outlet pressure/inlet pressure

A

EPR

18
Q

List 5 primary areas within a turbine engine, front to back:

A

see picture:

19
Q

IT IS A CONFIGURATION WHERE A PROPELLOR IS DRIVEN BY A TURBINE ENGINE.

The prop is typically driven thru a reduction gear system.

A

Turboprop engine

20
Q
  • It increases the static pressure from the inlet duct and directs it to the combustion chamber (thru diffuser) at the correct pressure (potential energy), velocity and temp
  • The Rotor and Stator vanes create divergent ducts
  • 1 complete COMP Stage is: A ROTOR followed by a STATOR.
A

AXIAL COMPRESSOR STAGE

21
Q

Type of Duct:

Increase Velocity of air

Decrease Diameter

Decrease Static Pressure

Temperature of air decreases

A

Divergent Duct

22
Q
  • The purpose of the TURBINE section is to convert the kinetic (velocity) and heat energy of the combustion gases into mechanical energy to rotate the Turbine to drive the fan/propeller/compressors/accessories.
  • The Turbine section is located downstream of the combustion section.
  • 1 complete TURBINE Stage is defined as: A STATOR followed by a ROTOR.
A

axial turbine stage

23
Q

Uses of Bleed air:

A

Cabin pressure

Starting

Anti-icing Systems

24
Q

Meaning of FADEC?

A

Full Authority Digital Engine Control

25
Q

Meaning of AGB?

A

Accessory Gearbox

26
Q

Meaning of EGT?

A

Exhaust Gas Temperature

27
Q

Meaning of HP?

A

High pressure

28
Q

Meaning of of LP?

A

Low pressure

29
Q

Meaning of IGV?

A

Inlet Guide vanes

30
Q

Occurs when the blade angle of attack exceeds the critical angle of attack, caused by an imbalance between the inlet velocity and rpm

A

compressor stall

31
Q

_____ ______ happens the air stream breaks away from the top wing surface.

A

Wing stall

32
Q

What is number 1?

A

Air inlet

33
Q

What is number 2?

A

Three stage Axial Flow Compressor

34
Q

What is 3?

A

Centrifugal Compressor

35
Q

What is 4?

A

Igniter

36
Q

What is 5?

A

Fuel Nozzle

37
Q

What is 6?

A

Compressor Turbine (Gas Producer)

38
Q

What is 7?

A

Free (Power Turbine)

39
Q

What is 8?

A

Exhaust Outlet

40
Q

What is 9?

A

Reduction Gearbox

41
Q

What is number 10?

A

Propeller Driveshaft

42
Q

What is number 11?

A

Accessory Gearbox

43
Q

Label the Pratt and Whitney PT6 engine airflow and stations?

Study this please

A

Study the figure

Turbines 2 (12 decks)

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