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Random Wind Tunnel and Smoke Pictures Thread
There is something reassuring and comforting about wind tunnel and smoke pictures, at least for me.
Post them if you have them. Mercedes-Benz-Blog: The new Mercedes-Benz E-Class Cabriolet - TecDay Aerodynamic 2009 - PART X http://mercedesbenzblogphotodb.files...009-part-x.jpg Dodge - 2010 Ram 1500 - Design - Best In Class Aerodynamics http://www.foundation5.com/client/ww...bic_prm_lb.jpg 100 Year-Old Aerodynamics Problem Solved: Could Increase MPG Dramatically By Ovidiu Sandru ..............September 27, 2008 100 Year-Old Aerodynamics Problem Solved: Could Increase MPG Dramatically - The Green Optimistic http://cdn.greenoptimistic.com/wp-co...ynamic_car.jpg Quote:
Car Wind Tunnel Data http://s704.photobucket.com/albums/w...o-esseesse.jpg |
Fantastic idea ! I hope this gets pinned.
By the way, that Dodge has the smoke PhotoShopped in. ( They wish it looked that good ! ) It is much closer to this Ford : http://0.tqn.com/d/trucks/1/0/C/F/1/...ind_tunnel.jpg |
A2WT HomePage. They are a wind tunnel that anyone can use (assuming you are willing to pay for the time) to test their cars. Many pictures and vids on their websites. Most cars aren't small eco-boxes like our but you can watch the videos and see how things really help or hurt aero.
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A2 Wind Tunnel
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Nice tunnel with a great crew. In the picture below is Dave Salazar the General Manager. He is an Aero Engineer and he has forgotten more than I will ever know. They have two tunnels there, the smaller A2 tunnel (which I could afford) and a much larger tunnel NASCAR uses adjacent to it which gets pricy quick.
One problem with wind tunnel testing a large vehicle in a wind tunnel with a small cross section, is that the final Cd number may be skewed due to the compression of the air between the walls of the constricted test chamber and the large frontal area of a vehicle like a full size truck. Best to test a small car in the A2. It is fun to watch the smoke though! Bondo |
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Got me to wondering about that VW wind tunnel with a rotating turntable base to simulate crosswinds. When I have the time I'll post something on that. RE: Photoshop Dodge truck smoke. They fooled me, I hate when that happens. Proves once again that you cannot trust everything you see on the Internet. Random pictures, like the thread title says: http://www.a2wt.com/Pictures.htm http://www.a2wt.com/images/A2web/C3VetteB.jpg http://www.a2wt.com/images/A2web/C6%20003.JPG http://www.a2wt.com/images/A2web/A2%...20COT%2005.JPG |
kach22i : Would it be all right with you if we also post tuft tests here as well ?
Unless you really know what to look for, I'm guessing most of us can't see turbulence with smoke testing as easily as you can with tuft testing. With tuft tests, you can literally see the pockets of air that are causing problems and the direction of the airflow. |
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http://stwot.motortrend.com/files/20...d-Tunnel-1.jpg
By looking at the smoke stream, it looks as if the wind speed here is moving at a crawl. I think GM doesn't wan't to show how bad that the drag is on the new Camaro. And note that this only shows the roofline. I'd like to see them test near that open grille. Aero disaster ! |
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For me tufts seem less intuitive, requiring intense examination and analysis when compare to smoke which just seems to flow effortlessly. Ignorance is bliss? http://www.odec.ca/projects/2007/morg7r2/report.html http://www.odec.ca/projects/2007/mor...ges/smoke1.jpg |
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http://images.caricos.com/m/mercedes...9_1024x768.jpg
A smoke stream would make this car look sleek, but the telltale tufts show just how much of a mess the car is to the air : http://farm9.staticflickr.com/8366/8...c44aa0fa6c.jpg |
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New Gas Mileage Rules Will Reshape What Americans Drive: Aerodynamics And Weight New Gas Mileage Rules Will Reshape What Americans Drive: Aerodynamics And Weight http://images.thecarconnection.com/l...00398283_l.jpg Quote:
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I assume this shape has been in a few wind tunnels before - so it qualifies.
Project Heinkel: Volkswagen - Origin of the world beating 'People's Car' http://4.bp.blogspot.com/-zK6NhEyLud...2BMaquette.jpg Quote:
http://images.hemmings.com/wp-conten...ro_04_1200.jpg Quote:
http://blog.hemmings.com/index.php/c...liners/page/2/ http://images.hemmings.com/wp-conten...esting_700.jpg Quote:
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Project Heinkel
http://4.bp.blogspot.com/-uZvDolQcZg...llpaper_06.jpg http://www.starcs.se/classical_methods.aspx http://www.starcs.se/UserUploadImage...CS_Smoke_4.jpg http://www.starcs.se/UserUploadImages/STARCS_Tufts.jpg Quote:
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Jaray model
This is the 'pumpkin seed' of which the Aerodynamic Streamlining Template is derived.Jaray derived his from a Cd 0.045 streamline body of revolution/airship form.Wolfgang Klemperer,who had his graduate degree in engineering in 1922 did the wind tunnel measurements for Jaray at the Zeppelin works of which they both worked.It measured Cd 0.13 in its 'best' edge configuration with wheels,on the 'ground.'
I used a Cd 0.04 body for the 'Template.' |
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More on it in Portuguese, use Google Chrome as your browser and it will translate it for you. Maybach - Paul Jaray e a aerodinâmica - Um olhar sobre as corridas Photo Caption: Quote:
Tatra T600 Tatraplan http://www.tatraplan.co.uk/tatraplan200.jpg Wind tunnel - Newton lab. - Tests, Certifications, Wind tunnel, Interlaboratory, Ballistic test, Helmet testing http://www.newtonlab.eu/img/foto/gal...entoCasco1.jpg http://deansgarage.com/2010/macminn%...-lemans-coupe/ http://deansgarage.com/wp-content/ga...lemanscpe5.jpg |
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One from your own collection, thanks Neil.
Schlor Pillbug Photos by NeilBlanchard | Photobucket Some more on that car. : : PROTOTYP - PERSONEN. KRAFT. WAGEN. : : http://www.prototyp-hamburg.de/new/newspics/a_823.jpg |
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George, that is a picture of the Schlörwagen I have not seen before, and it seems to be only available in that tiny Flash slideshow... :( No tufts on it, either.
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Gregg Fraley, Creativity & Innovation Consultant, Professional Speaker. Idea generation training and new product development | 2013-ats-sedan-performance-aerodynamic-design-video-960×540
http://greggfraley.com/wp-content/up...eo-960x540.jpg Pictures: A Rare Look Inside Carmakers' Drive for 55 MPG http://images.nationalgeographic.com...56_600x450.jpg Mercedes-Benz Aerodynamics: Emotion meets efficiency By Adrian-Liviu Dorofte at Friday, February 15, 2013 Mercedes-Benz-Blog: Mercedes-Benz Aerodynamics: Emotion meets efficiency http://2.bp.blogspot.com/-5CB5GcEZ2A...amics+(12).jpg http://1.bp.blogspot.com/-ha5JB0W_Mi...amics+Data.png |
When I saw you had posted I expected it would be this one, so yay me:
http://ecomodder.com/forum/member-fr...535-small.jpgl There's a slide show, 4 of 5 on-topic. |
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Does this last image indicate that attachment os air flow is not everything? http://lh4.ggpht.com/-I0UGBA4rTH8/UV...5B3%25255D.jpg Seems to look like the air knows what to do and is not tumbling away in a disruptive manner. EDIT-1: The wheels do not seem to be turning in the wind tunnel photos, therefore the draw of the engine fan does not seem to be entering the equation. Making the air flow even more flattering for this design, or less so? The messy air and pressure discharge under the car's engine bay would undo any gains topside though the rear engine intake? |
I was going to say it indicates an engine starved for air. :) But you are [apparently] right.
Most all of the pictures with smoke streaming the length of the vehicle show that orderly detachment. I'd like to see the smoke applied from the rear as so: I didn't look at the pics a lot, I was mainly interested in the list of cars that have a higher Cd today. The only thing that tops it is the VW LX1 and it's a tandem 2-seater. Quote:
http://ecomodder.com/forum/member-fr...43-index2b.jpg If things had gone a little differently it would be as iconic a shape as the 911 and you could get them in a carbon fiber/titanium mesh today. I'd like to see the cut line in back go more like this: http://ecomodder.com/forum/member-fr...0f89f1d9b5.jpg With an electic motor, you wouldn't have to worry about fumes seeping forward. Bu, like you, I would really like to see the underside to see how Volkhart handled the airflow around the engine and exhaust. |
A lot of windtunnel pics that make it into the sales brochures & advertising, are doctored pics ...
Look at the real Zonda tunnel pics, and the cleaned side view ... reality isn't anywhere that clean. |
http://www.curbsideclassic.com/autom...t-1-1899-1939/
http://www.curbsideclassic.com/wp-co...ind-tunnel.jpg Quote:
http://www.mercedes-benz-classic.com...05_715x400.jpg Aerodynamics - Tech - European Car Magazine http://image.europeancarweb.com/f/te...es_clk_top.jpg Aerodynamics Mercedes Clk Rear Right Window Photo 4 http://image.europeancarweb.com/f/te...ght_window.jpg |
The “large wind tunnel” in Untertürkheim | Mercedes-Benz Passion eBlog
http://eblog.mercedes-benz-passion.c...9c1143_026.jpg http://www.autospeed.com/cms/article.html?&A=112241 http://us1.webpublications.com.au/st...ics/112241.jpg Quote:
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Styling, fins, aerodynamics, and the Dart concept car
http://www.allpar.com/history/memories/fins/fin-9.jpg Quote:
.................................................. ..................... http://socialpublish.mercedes-benz.c...ind-tunnel-77/ http://socialpublish.mercedes-benz.c...90_upscale.jpg Quote:
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Commute Cars - Electric-Bikes.com
http://www.electric-bikes.com/better...kgroundhtc.jpg Wind Maker http://www.trillian.de/images/bmw-windmacher_4.jpg MIT Solar Car - Massachusetts Institute of Technology solar car shines | dasolar.com http://www.dasolar.com/images/conten...solar-car2.jpg Luminos -- Stanford's Solar Car | CleanTechnica http://i0.wp.com/cleantechnica.com/f...unnel-test.jpg UM System Curators Approve State Street S&T Wind Tunnel http://experiencethis.mst.edu/files/...DSC_0009_3.jpg http://experiencethis.mst.edu/files/...9562_2_2_2.jpg |
http://experiencethis.mst.edu/files/...9562_2_2_2.jpg
Does this mean you've posted all the wind tunnel smoke pictures on Internet? I've been wondering how long you'd keep that run going. |
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Tufts are allowed in the thread, so are any other vehicle types of interest. The forum has so many other threads in which tuft and smoke images are posted, maybe it's a good time to corral them all here? Wool Tuft test http://www.gerrelt.nl/roofspoiler/wo...h_2.jpghttp:// Aero Testing the Mopar Missile http://www.allpar.com/photos/racing/...rodynamics.jpg AutoSpeed - Aero Testing - Part 1 http://us1.webpublications.com.au/st...108656_2mg.jpg Smoke and Tuft Flow Visualization http://www.grc.nasa.gov/WWW/k-12/air.../tunvsmoke.jpg Beetle Aerodynamics / Roofspoiler http://www.gerrelt.nl/roofspoiler/be...unnel_test.jpg http://rotorcraft.arc.nasa.gov/Resea.../brownout.html http://rotorcraft.arc.nasa.gov/Resea...p_image008.png Human Power Team Delft & Amsterdam - The path of Velox 2 aerodynamics http://www.hptdelft.nl/en/images/blo...ukje/tufts.png |
Water testing too.............why not?
AutoSpeed - Aero Testing - Part 4 http://us1.webpublications.com.au/st...08676_13lo.jpg Quote:
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Very interesting find. I bet Richard Petty would have loved to have lost that concave rear window for a convex one. |
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