Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Turbine Engines > Test 2 Review > Flashcards

Test 2 Review Flashcards

1
Q

Whats happening to the air in the diffuser?

A

Increase pressure

Stagnate Velocity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

How do we turn potential energy, into KINETIC energy?

A

Fuel + Ignition into the air mixture

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Where is the largest amount of kinetic energy found?

A

The OUTLET of the COMBUSTION chamber (Acceleration)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What makes up the single stage of a compressor?

A

Inlet guide vane
Rotor
Stator

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What do we call the last stage stators, and what do they do?

A

Exit Guide Vanes

STRAIGHTEN airflow going into diffuser

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Function of a compressor STATOR?

A

Increase pressure, decrease velocity

due to its DIVERGENT shape

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What do we want CONSTANT in the COMPRESSOR? How do we get it?

A

Constant VELOCITY

We get it by the CONVERGENT shape from inlet to end (blades get SMALLER)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is it called when the blade AOA exceeds the critical AOA, caused by an IMBALANCE between the INLET and ROTATIONAL velocities

A

COMPRESSOR STALL

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What can happen if we leave a stall unchecked?

A

hung stall/SURGE = damage

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is a compressor surge?

A

huge build of of PRESSURE released quickly through the front and back of engine

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

When the aircraft is flying, what are the ways STALL/SURGE can occur?

A

airflow DISRUPTED/TURBULENT to engine

RAPID engine acceleration/deceleration

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

If you’re in a high power setting and you feel a stall coming, what should you do?

A

Decrease power
IGV
Control Bleed Valves
Variable stators

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

How do we fix a dirty engine?

A

Compressor wash (fluid/grit blast)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Turbo prop and turbo shaft use what type of compressor?

A

Centrifugal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Control bleed, what are do we get it from?

A

Mid section of Comp and diffuser

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What areas do we target with compressor bleed air?

A 
Starting engine
Cabin Pressurization 
Cooling/Heating 
Engine Cooling 
Pressurization of reservoir 
Pumps  
ANTI ICE
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What do we use ram air for?

A

Engine Gen. Cooling

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Why do compressor blades have a twist?

A

for EVEN acceleration of air across the blades

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What are the types of blade root designs?

A

Dovetail
Fir Tree
Bulb root

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What are the purpose of blade root designs?

A

Radial movement (centrifugally)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

How do we protect from axial movement?

A

rivet
lock wire
lock tab

22
Q

What are the disadvantages of Axial Flow Compressors?

A

high cost
complex
high weight

23
Q

What are the disadvantage of a Centrifugal Compressor?

A

heavy

LIMITED compression ratio

24
Q

Compressor blades and discs are manufactured as a single assembly called what?

A

BLISK (blade integrated disk)

25
Q

Differential pressure between the rotors and stators caused by the camber of the blades is called what?

A

Cascading Effect

26
Q

What is cascade effect?

A

The process of involving velocity and pressure changes through several stages of compression

27
Q

When replacing the fan blade, what do you do?

A

Replace the one 180 degrees across it

28
Q

First stage of compressor stator are called what?

A

IGV

29
Q

What is the purpose of BLADE PROFILING?

A

reduce THICKNESS towards the the TIP to reduce VIBRATION (nat. frreq.)

30
Q

Purpose of the DILUTION HOLES?

A

Cools the flames before the nozzle guide vanes and turbines

31
Q

What to Ceramic Matrix Composites do? (CMC)

A

Increases thermal efficiency = increase propulsion efficiency

32
Q

What are the 2 functions of PRE SWIRL VANES?

A
  1. Reduce Velocity

2. Swirl fuel spray for better atomization = efficiency

33
Q

What provides a path to spread the combustion evenly for a MULTI Can Combustor?

A

Flame propagation tube

34
Q

What are the 3 different type of Combustion chambers?

A

Annular
Can-Annular
Multi Can

35
Q

What type of airc. do we use a Reverse Flow Annular?

A

PT6 engine
Helicopter
Turboprop

36
Q

What type of TURBINE for centrifugal flow compressor?

A

Radial Inflow

37
Q

What are the 2 types of TURBINES?

A

Radial Inflow

Axial Flow

38
Q

What is the purpose of the gas turbine?

A

Drive the compressor
Gearbox
Accessories

39
Q

What are the 2 designs of TURBINE STATORS?

A
  1. direct air at ANGLE to TURN turbine ROTOR

2. increase velocity (CONVERGENT STATORS ONLY)

40
Q

Where do we find convergent stators?

A

TURBINES

41
Q

What are the types of Turbine Blades?

A

Impulse
Reaction
Impulse-Reaction

42
Q

Impulse is?

A

Convergent stators

43
Q

Reaction is?

A

Straight through stators

44
Q

Is density DIRECTLY proportional to thrust?

A

Yes

45
Q

What will the gas turbine do on a turboshaft/turbo prop engine?

A

drive the compressor
accessory
gearbox

46
Q

What is the reduction gearbox driven by?

A

free turbine

47
Q

Engine airflow stations

A

Tt, Pt, Ps

48
Q

Purpose Vortex generators

A

smoothen airflow going into compressors

49
Q

Advantage of modular engine design?

A

Reduced maintenance cost

50
Q

Purpose of the holes in turbine stator/ rotor blades?

A

Convection/film cooling

Turbine Engines (12 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions