Following
data was obtained from Simulations carried out in SolidWorks Flow Simulation
Premium.
Without Bumps
|
|
|
|
|
|
Air Speed in Km/h
|
Down Force in N
|
Drag in N
|
120
|
98.682
|
33.234
|
110
|
82.88
|
27.957
|
100
|
68.266
|
23.02
|
90
|
55.299
|
18.668
|
80
|
43.529
|
14.697
|
70
|
33.284
|
11.255
|
60
|
24.438
|
8.272
|
50
|
16.982
|
5.769
|
40
|
10.83
|
3.688
|
30
|
6.08
|
2.081
|
20
|
2.681
|
0.929
|
10
|
0.648
|
0.235
|
With Bumps
|
|
|
|
|
|
Air Speed in Km/h
|
Down Force in N
|
Drag in N
|
120
|
108.238
|
30.47
|
110
|
90.599
|
25.549
|
100
|
74.818
|
21.047
|
90
|
60.423
|
17.014
|
80
|
47.695
|
13.443
|
70
|
36.441
|
10.27
|
60
|
26.682
|
7.532
|
50
|
18.504
|
5.228
|
40
|
11.82
|
3.352
|
30
|
6.613
|
1.886
|
20
|
2.909
|
0.841
|
10
|
0.685
|
0.211
|
Comparison between
Down Force and Drag
Air Speed in Km/h
|
Percentage Less Drag
|
|
Percentage More Down Force
|
120
|
8.32
|
|
8.83
|
110
|
8.61
|
|
8.51
|
100
|
8.57
|
|
8.76
|
90
|
8.86
|
|
8.48
|
80
|
8.53
|
|
8.73
|
70
|
8.75
|
|
8.66
|
60
|
8.95
|
|
8.41
|
50
|
9.38
|
|
8.23
|
40
|
9.11
|
|
8.38
|
30
|
9.37
|
|
8.06
|
20
|
9.47
|
|
7.84
|
10
|
10.21
|
|
5.4
|
|
|
|
|
It
is clear that the spoiler with humpback whale's fin's inspired profile not only
produce more down force at a particular velocity but also less drag.
Data for Spoiler without
Humpback Whale's Fin's Inspired Bumps:
Wing
Span: 100 cm
Chord
Length: 17.5 cm
Air
Velocity: 0-120 Km/h head on
Vertical
Pitch: 22.5 Degree Downwards
Gravity
Considered
Fluid:
Dry Air at STP
Mesh
Settings: Coarse (3/10)
Data for Spoiler with
Humpback Whale's Fin's Bumps:
Wing
Span: 100 cm
Chord
Length Large: 17.5 cm
Chord
Length Small: 15.75 cm
Air
Velocity: 0-120 Km/h head on
Vertical
Pitch: 22.5 Degree Downwards
Gravity
Considered
Fluid:
Dry Air at STP
Mesh
Settings: Coarse (3/10)
Let's
now take a look at visual representation of data.
This Plot Shows
Air Velocity VS Drag, Down-Force by the Spoiler without Bumps
This Plot Shows
Air Velocity VS Drag, Down-Force by the Spoiler with Bumps
As
you can see from above two plots; the spoiler with the whale's fin like profile
generates more down force and less drag.
This Plot Shows
Air Velocity VS Down-Force Generated by the Spoilers
The
green line represents the Down-Force generated by the spoiler with whale's fin's
inspired design. It is around eight percent more at each velocity.
This Plot Shows
Air Velocity VS Drag Generated by the Spoilers
The
green line represents the Drag generated by the spoiler with whale's fin
inspired design. It is around nine percent less at each velocity.
This Plot Shows Air
velocity VS Down-Force to Drag Ratio
It is clear from this plot that Down-Force to Drag ratio is around sixteen
percent more for whale's fin's inspired spoiler than the legacy one at each
velocity.
This Plot Shows Air Flow Around the Spoiler without Bumps at 120 Km/h from the Right Side.
This Plot Shows Air Flow Around the Spoiler without Bumps at 120 Km/h.
This Plot Shows Air Flow Around the Spoiler with bumps at 120 Km/h.
This plot Shows Air Flow Around the Spoiler with bumps at 120 Km/h.
A simple stress analysis was carried out on both spoilers at 120 Km/h. FOS was greater than 1 for both cases.
Advantages of Spoilers:
The main benefit of installing a spoiler on a car is to help it maintain traction at very high speeds. Particularly at speeds around 90 Km/h. A car with a spoiler installed will be easier to handle at highway speeds. Rear spoilers such as the one's analysed in this study; push the back of the car down so the tires can grip the road better and increase stability. It also increases the braking ability of the car.
To build the prototypes and complete the study further, I need donations. To donate your part send an email to fadoobaba@live.com , tweet @fadoobaba, PM at https://www.facebook.com/ThreeDimensionalDesign orhttps://grabcad.com/fahad.rafi.butt or comment with your contact details and I will contact you!. Thank you for reading!
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