concept cars aerodynamic - Fuelly Forums

Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

Reply
 
Thread Tools Display Modes
 
Old 07-22-2007, 11:21 AM   #1
Registered Member
 
Join Date: Jul 2006
Posts: 57
Country: United States
concept cars aerodynamic

I have seen more images about citroen C-Sportloungue and the Lotus "circuit car", and I have noticed the way in which the planners they have decided to isolate the front wheels aerodynamically.
some image:


By fabrio at 2007-07-22


By fabrio at 2007-07-22


By fabrio at 2007-07-22

about the lotus, from http://www.gglotus.org/ggrace/circuitcar/circuitcar.htm
You can read:
"#

Aerodynamics
# Flat bottom with front aero splitter and rear diffuser
# Aerodynamically designed body shape with minimal drag and frontal area
# Single plane rear wing, high downforce, carbon composite, dual element rear wing (optional)"

and about the citroen from:
http://car.kak.net/modules.php?op=mo...ticle&sid=4660

You can read this one:

"Optimised aerodynamic design

Special attention has been paid to the aerodynamic, flowing lines - strong Citroën values. The drag coefficient is 0.26 and rear lift 0.02. In addition to styling and volume that enhance air penetration, various technological features contribute to that result:

- air ducts on both sides of the front bumper. They produce an air flow through the front wheel arches, creating a virtual fairing.
- an electro-mechanical system at the rear of the roof. It consists of micro electro-mechanical systems (MEMs), which create a virtual airfoil by propelling jets of air and substantially improve the vehicle's drag and stability at high speeds.
- a reverse mobile airfoil, under the structure at the rear of the vehicle. This cylinder-activated reverse airfoil improves lift and enhances vehicle stability at high speeds. It has three positions:
- a "neutral" position, integrated with the rear styling, when the vehicle is stationary or in the city,
- a position adopted at a cruising speed of above 90 kph that optimises the drag coefficient and lift,
- a position activated during emergency braking to increase negative lift by adding support and stabilising the vehicle.
- the smooth subframe improves both drag and positive lift by optimising air flow under the vehicle.

This capacity to penetrate the air enhances the C SportLounge's efficient, dynamic handling, performance and environmental-friendliness."

Now, second you, this system in order to guide the air around the wheels is better or worse to the classics flow shunters?

for examples this?



It is possible, to install this particular system of air guide?
__________________

__________________
.................................................. .....
my English is bad, but I do not surrender!
.................................................. .....

fabrio is offline   Reply With Quote
Old 07-22-2007, 01:42 PM   #2
Registered Member
 
lunarhighway's Avatar
 
Join Date: Dec 2006
Posts: 360
Country: United States
wheel aerodynamics is a complex matter, and i'm not sure i fully understand it, but i'm sure there are ways to improve the airflow trough the wells.

the citroën seems to have two separate ducts. i think the lower ones are for break cooling and the upper ones seem to vent air into the upper wheelwell.

the second car seems to have one intake, but it might split internally to do the same.

i read somewhere that a lot of wheel drag is assosiated with the fact that the airflow follows the direction of the wheel. at the back of the wheel it's carried upwards into the wheelwell and than forward at the top of the wheel and than down again there it meets the oncoming air at the botton of the bumper. wich is partly why fairings (like you made) should work.

letting air into the wheelwell at the top might change the pressure and provide a better aerodynamic situation.

anyway that's what i've pieced together from things i found on the web, i'm not sure if what i say is right.

i think citroën's are a good source of inspiration (maybe production cars even more then concept cars) , because they have a long history of innovative cars and their FE is very good. the classic citroën DS for example has a completely flat underside and variable ground clearance. try to find that on a production car today!
__________________

__________________

lunarhighway is offline   Reply With Quote
Old 07-22-2007, 05:42 PM   #3
Registered Member
 
Join Date: Jul 2006
Posts: 57
Country: United States
I suppose that, you refer at this image:



about my job http://www.gassavers.org/showthread.php?t=4385, I have noticed an increase of turbolent flow noise, you think thats are necessary an modification?

please, read my other topic:
http://www.gassavers.org/showthread.php?t=4429

also this:
http://www.gassavers.org/showthread.php?t=4431

I would appreciate your comment.

thanks

ciao

fabrio
__________________
.................................................. .....
my English is bad, but I do not surrender!
.................................................. .....

fabrio is offline   Reply With Quote
Old 07-22-2007, 06:29 PM   #4
Registered Member
 
basjoos's Avatar
 
Join Date: Mar 2006
Posts: 392
Country: United States
Increased wind noise is an indication of increased turbulence. As you decrease turbulance and drag, the car should produce less wind noise and become quieter.
__________________
]
aerocivic.com
basjoos is offline   Reply With Quote
Old 07-22-2007, 06:37 PM   #5
Registered Member
 
Join Date: Jul 2006
Posts: 57
Country: United States
YES!!!!

but the nois is increased!
__________________
.................................................. .....
my English is bad, but I do not surrender!
.................................................. .....

fabrio is offline   Reply With Quote
Old 07-22-2007, 07:24 PM   #6
Registered Member
 
Join Date: Mar 2007
Posts: 1,138
Country: United States
My car has a huge space around the rear wheels within the fender well. It is not needed for suspension travel, and is not occupied by struts or springs or anything like that.

Would it
a)possibly
b)probably
c)probably not
be helpful to make some fender liners to reduce the amount of space? They would basically be the shape of the wheel arch.
__________________
Bill in Houston is offline   Reply With Quote
Old 07-22-2007, 07:46 PM   #7
Registered Member
 
Join Date: Jul 2006
Posts: 57
Country: United States
Quote:
Originally Posted by Bill in Houston View Post
......

Would it
what means?

and this ?
Quote:
Originally Posted by Bill in Houston View Post
a)possibly
b)probably
c)probably not
be helpful to make some fender liners to reduce the amount of space? They would basically be the shape of the wheel arch.
excuse, but I do not understand
__________________
.................................................. .....
my English is bad, but I do not surrender!
.................................................. .....

fabrio is offline   Reply With Quote
Old 07-22-2007, 08:17 PM   #8
Registered Member
 
Join Date: Mar 2007
Posts: 1,138
Country: United States
I was asking a separate question from yours, but related to wheel well turbulence.
__________________
Bill in Houston is offline   Reply With Quote
Old 07-22-2007, 11:33 PM   #9
Registered Member
 
Join Date: Jul 2007
Posts: 19
Country: United States
Aero Mod Infohttp://www.hotrod.com/techarticles/b...ips/index.html
GasSavers_rookie is offline   Reply With Quote
Old 07-23-2007, 02:40 AM   #10
Registered Member
 
Join Date: Jul 2006
Posts: 57
Country: United States
Quote:
Originally Posted by Bill in Houston View Post
I was asking a separate question from yours, but related to wheel well turbulence.
ah... you can show to me a photo of wheel well ?
__________________

__________________
.................................................. .....
my English is bad, but I do not surrender!
.................................................. .....

fabrio is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Super high MPG cars we may never see kickflipjr General Fuel Topics 44 10-31-2013 09:54 AM
Fuelly Android App - eehokie Fuelly Web Support and Community News 2 07-14-2010 09:59 PM
Tire sizing odometer modifier? BDC Fuelly Web Support and Community News 10 07-25-2009 09:59 PM
Combined totals of all my vehicles? nizationpcs Fuelly Web Support and Community News 0 03-30-2009 07:41 AM
mpg vs mph: prius graph MetroMPG General Fuel Topics 5 05-03-2006 06:56 PM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 08:37 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.