Brainscape's Knowledge GenomeTM

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


See full index

Aerodynamics > Aerofoil Design > Flashcards

Aerofoil Design Flashcards

1
Q

What is a chord line

A

A straight line connecting LE to TE

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

What is Chord

A

The length of the chord line

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

What is Mean Aerodynamic Chord (MAC)

A

The chord average from root to wingtip

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

What is thickness/ Chord ratio

A

The thickest section of wing expressed as a percentage of chord length
Typically ~ 12%

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

What is the mean camber line

A

Line formed by at halfway between upper and lower surface of a wing. From LE to TE

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

What is aerofoil camber

A

Dist between mean chord and mean camber line

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

Where is the max camber of an aerofoil

A

At the point where mean chord and mean camber lines are furthest apart

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

Can the points of max camber and max thickness be co-located

A

Yes

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

What is upwash WRT low pressure above a wing

A

Air approaching the LE starts to flow upwards due to low pressure above the wing

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

What causes wing tip vortices

A

Spanwise flow

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

WRT RAF which direction does lift act

A

Perpendicular

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

What is the total reaction of an aerofoil

A

The resultant of lift and drag forces

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

What 2 parameters are used to measure AoA

A

Chord line and RAF

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

What is the critical angle of an aerofoil

A

AoA which if exceedes airflow will seperate from top of wing, causing large sudden decrease in lift

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

The angle of attack of an aerofoil is the angle measured between the _____ & the RAF

A

Chordline

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

What would be required for an aerofoil to generate no lift

A

Negative AOA or be at an angle below horizontal

17
Q

What is leading edge stagnation point

A

Air molecules impacting the leading edge, causing them to bunch up resulting in an envelope of high pressure air

18
Q

Does the LE stagnation point only consist of dynamic pressure

A

No

19
Q

What is total head pressure and how does it differ from RAF

A

Is combination of static and dynamic pressure from LE stagnation point

20
Q

Is total head pressure greater or lower that RAF static pressure

A

Greater

21
Q

Does a higher AoA increase or decrease LE stagnation pressure

A

Increase

22
Q

What is total head pressure

A

Total head pressure is the pressure of the completely stopped air within the LE stagnation point

23
Q

Does total head pressure aid or hinder aircraft movement

A

Hinder

24
Q

Does the low pressure area above the wing act through a single point

A

No, load is spread over chord of the wing

25
Q

What is it called when the low pressure is represented by by a single point on the chord line

A

CP

26
Q

What happens to CP when AoA is increased

A

CP moves forward

27
Q

What happens to the Low Pressure on the upper wing at the Critical Angle

A

CP moves towards LE and collapses, resulting in large sudden loss of lift

28
Q

Will a high lift wing have a high or low thickness/ chord ratio

A

High

29
Q

Will a short take off landing aircraft have a high degree of camber and thickness or low degree of camber and thickness

A

High and high

30
Q

When and why would a symmetrica aerofoil be used?

A

Why: to supply equal amounts of lift in both positive and negative directions
When: vertical stabliser

31
Q

When will symmetrical aerofoils produce lift?

A

As soon as AoA is created relative to RAF

32
Q

What are typical characteristics of a high speed aerofoil

A

Low drag section, little camber

33
Q

What are the advantages of high speed aerofoil

A

High subsonic speeds for long range

Fuel efficient

34
Q

WRT shockwaves, how does a gentle camber high speed aerofoil affect change the formation of shockwaves

A

The gentle upper surface delays build up of shockwaves at high subsonic speeds, reducing shock drag rise/ shock stall

Aerodynamics (3 decks)

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