Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Motorsport Aerodynamics

10,696 views

Published on

origional URL
http://engineering.union.edu/~brunob/Fluids%20II%20papers/Motorsport%20Aerodynamics.ppt

Published in: Technology, Business
  • DOWNLOAD THIS BOOKS INTO AVAILABLE FORMAT (Unlimited) ......................................................................................................................... ......................................................................................................................... Download Full PDF EBOOK here { https://tinyurl.com/y6a5rkg5 } ......................................................................................................................... Download Full EPUB Ebook here { https://tinyurl.com/y6a5rkg5 } ......................................................................................................................... ACCESS WEBSITE for All Ebooks ......................................................................................................................... Download Full PDF EBOOK here { https://tinyurl.com/y6a5rkg5 } ......................................................................................................................... Download EPUB Ebook here { https://tinyurl.com/y6a5rkg5 } ......................................................................................................................... Download doc Ebook here { https://tinyurl.com/y6a5rkg5 } ......................................................................................................................... ......................................................................................................................... ......................................................................................................................... .............. Browse by Genre Available eBooks ......................................................................................................................... Art, Biography, Business, Chick Lit, Children's, Christian, Classics, Comics, Contemporary, Cookbooks, Crime, Ebooks, Fantasy, Fiction, Graphic Novels, Historical Fiction, History, Horror, Humor And Comedy, Manga, Memoir, Music, Mystery, Non Fiction, Paranormal, Philosophy, Poetry, Psychology, Religion, Romance, Science, Science Fiction, Self Help, Suspense, Spirituality, Sports, Thriller, Travel, Young Adult,
       Reply 
    Are you sure you want to  Yes  No
    Your message goes here
  • its very nice, good work.
    thanks to slideshare
       Reply 
    Are you sure you want to  Yes  No
    Your message goes here

Motorsport Aerodynamics

  1. 1. Motorsport Aerodynamics Jamie Arner Brian Feldman 16
  2. 2. Importance of Aerodynamics 2 12
  3. 3. Aerodynamic Design Methodology <ul><li>CFD </li></ul><ul><ul><li>Develop parts and visualize flow over car and devices before models are built </li></ul></ul><ul><li>Wind Tunnel </li></ul><ul><ul><li>Scale model testing of devices </li></ul></ul><ul><ul><li>Full size testing of vehicle (rolling road) </li></ul></ul><ul><li>Track </li></ul><ul><ul><li>Devices are assessed and approved for racing </li></ul></ul>
  4. 4. Motorsports <ul><li>Highly Developed </li></ul><ul><li>Highly Secretive </li></ul><ul><li>Heavily Regulated </li></ul><ul><li>Extremely Competitive </li></ul>5
  5. 5. Front Air Dam <ul><li>Limits the Amount of Air Passing Underneath the Car </li></ul><ul><li>Contributes to High Pressure In Front of the Car </li></ul><ul><li>Causes Low Pressure Underneath the Car </li></ul>10
  6. 6. Front Splitter Captures Some of the High Pressure Created In Front of the Air Dam, Causing Downforce 13
  7. 7. Side Skirts <ul><li>Side Skirts Prevent High Pressure Air Around the Car from </li></ul><ul><li>Disturbing the Low Pressure Underneath the Car </li></ul>11
  8. 8. Canards (French for Duck) <ul><li>Captures a Small Amount </li></ul><ul><li>of Downforce by Redirecting </li></ul><ul><li>Airflow Upward. </li></ul><ul><li>Main Purpose is the </li></ul><ul><li>Creation of Large Vortices </li></ul><ul><li>That Run the Length of </li></ul><ul><li>the Vehicle </li></ul>5
  9. 9. Canard Vortices <ul><li>Vortices Spin Inwards, Towards the Vehicle on Each Side </li></ul><ul><li>Canard Vortices Work In Conjunction With Side Skirts to Limit the High Pressure Air From Mixing With the Low Pressure Air Found Underneath the Car </li></ul>5
  10. 10. Venturi Tunnels / Rear Diffusers 5
  11. 11. Ground Effects <ul><li>Ride Height </li></ul><ul><ul><li>Downforce Increases </li></ul></ul><ul><ul><li>with Reduced Clearance h </li></ul></ul><ul><ul><li>Diffuser Stall </li></ul></ul><ul><ul><ul><li>Individual to Each Design </li></ul></ul></ul>2
  12. 12. Underbody Pressure <ul><li>Suction Peak Occurs Near the Diffuser Entrance </li></ul><ul><li>Can be used to Control the Vehicle Center of Pressure </li></ul>12
  13. 13. Rear Diffuser <ul><li>Expands Air Back Down </li></ul><ul><li>to Road Velocity </li></ul><ul><li>Slows the Flow and Raises </li></ul><ul><li>the Air Pressure </li></ul><ul><li>Acts as a Pump Drawing </li></ul><ul><li>More Air from the Undertray </li></ul><ul><li>Rear Wing Drives the </li></ul><ul><li>Diffuser Because of its Proximity to the Wing's Low Pressure Side </li></ul><ul><li>Reduce the Overall Pressure Drag on the Vehicle by Introducing High Pressure Air into the Low Pressure Wake Region </li></ul>13
  14. 14. Diffuser Vortices <ul><li>Two Vortices form at the Side Edges </li></ul><ul><li>of the Diffuser </li></ul><ul><ul><li>Flow Separates at the Sharp Leading Edge </li></ul></ul><ul><ul><li>Reattached by the Side Vortices </li></ul></ul><ul><ul><li>Separation Line is Dictated by the Leading Edge </li></ul></ul><ul><ul><ul><li>Reynolds Number Effect Insignificant </li></ul></ul></ul><ul><li>Reasons for Loss of Downforce at Low Ground Clearance </li></ul><ul><ul><li>Vortex Breakdown </li></ul></ul>2 9
  15. 15. Venturi Tunnels <ul><li>Venturi effect </li></ul><ul><ul><li>constricts the flow </li></ul></ul><ul><ul><ul><li>creates low pressure </li></ul></ul></ul><ul><ul><ul><li>high velocity flow </li></ul></ul></ul><ul><li>Less pitch sensitive than flat bottom </li></ul><ul><li>Highly regulated to limit cornering speeds </li></ul>
  16. 16. Underbody Vortices <ul><li>Induced vortex speeds up </li></ul><ul><li>flow over F-16 wing </li></ul><ul><ul><li>Vortex Lift </li></ul></ul><ul><li>Vortex Generators speed </li></ul><ul><li>up flow at the front </li></ul><ul><ul><li>Strong stable vortex creates </li></ul></ul><ul><ul><li>suction loads along its trail </li></ul></ul><ul><ul><li>Bernoulli says air </li></ul></ul><ul><ul><li>pressure decreases </li></ul></ul>Strakes 12
  17. 17. Vortex Generators <ul><li>Trips the Boundary Layer, Causing the Laminar Air Traveling </li></ul><ul><li>Over the Roof to Become Turbulent </li></ul><ul><li>Typically the size of the boundary layer, </li></ul><ul><li>15mm - 30mm at the rear end of a vehicle roof </li></ul>13
  18. 18. Effect of VG’s on Flow Separation With VG Without VG VG Separation Region Separation Region 3
  19. 19. Effect on Bluff Bodies With VG Without VG <ul><li>Higher Velocities Closer to Car, </li></ul><ul><li>Resulting in a Smaller Wake Behind Vehicle </li></ul><ul><li>VG’s Cause Drag, but Reduce Pressure Drag by </li></ul><ul><li>Delaying Flow Separation from Occurring </li></ul><ul><li>Reducing the Magnitude of the Separation Region </li></ul><ul><li>Increases the Static Pressure of Separation Region </li></ul>3
  20. 20. Wing Endplates <ul><li>A Wing with Endplates is Equivalent to </li></ul><ul><li>a Longer Wing Without Endplates </li></ul><ul><li>Effective Aspect Ratio </li></ul><ul><li>Aspect Ratio (AR) = Span/Chord </li></ul><ul><li>AR_effective = </li></ul><ul><li>AR*(1+1.9*(Endplate Depth/Span) </li></ul>12
  21. 21. Gurney Flaps Typically 1% to 4% of the Wing Chord Length 5
  22. 22. Effect of a Gurney Flap on Flow <ul><li>At High Angles of Attack, </li></ul><ul><li>Flow Separates </li></ul><ul><li>Addition of Gurney Flap </li></ul><ul><li>Reattaches Flow </li></ul><ul><li>Can Increase the Downforce </li></ul><ul><li>of the Wing up to 30% </li></ul><ul><li>Can Provide the Same </li></ul><ul><li>Amount of Downforce with </li></ul><ul><li>3 O less Angle of Attack </li></ul>15
  23. 23. How a Gurney Flap Works <ul><li>Vortices Reattach Flow and Redirect it Slightly Upwards </li></ul><ul><li>Relative to the Flow Over a “Clean” Wing, Implying An </li></ul><ul><li>Increase in Circulation as the cause of increased </li></ul><ul><li>Downforce </li></ul>5
  24. 24. Gurney Flap Size Vs. Lift 6
  25. 25. Current Research on Gurney Flaps <ul><li>Von Karman Vortex Street </li></ul><ul><li>Forms Downstream of </li></ul><ul><li>Gurney Flap </li></ul><ul><li>Fluid of Negative Vorticity </li></ul><ul><li>Becomes “Trapped” </li></ul><ul><li>Upstream of Gurney Flap </li></ul><ul><li>Trapped Fluid Escapes, </li></ul><ul><li>Interfering Either </li></ul><ul><li>Constructively or </li></ul><ul><li>Destructively with </li></ul><ul><li>Downstream Vortices </li></ul><ul><li>Increases Circulation and </li></ul><ul><li>Downforce </li></ul>6
  26. 26. Additional Aerodynamic Considerations 9 5
  27. 27. Questions ? 14
  28. 28. References <ul><li>Jang et al, “Numerical investigation of an airfoil with a Gurney flap” 1998 </li></ul><ul><li>Katz, Joseph. “Aerodynamics of Race Cars” 2006 </li></ul><ul><li>Koike et al, “Research on Aerodynamic Drag Reduction by Vortex Generators” 2004 </li></ul><ul><li>Nikolic, “Additional Aerodynamic Features of Wing-Gurney Flap Flows” 2006 </li></ul><ul><li>Sport Compact Car Magazine “Automotive Aerodynamic: Part 2” </li></ul><ul><li>Troolin et al, “Time Resolved PIV Analysis of Flow Over a NACA 0015 Airfoil with Gurney Flap” 2006 </li></ul><ul><li>Troolin et al, “Time Resolved PIV Analysis of a Gurney flap on a NACA 0015 Airfoil” 2005 </li></ul><ul><li>Troolin et al, “The Effect of Gurney Flap Height on Vortex Shedding Modes Behind Symmetric Airfoils” 2006 </li></ul><ul><li>Zhang, Xin et al. “Ground Effect Aerodynamics of Race Cars” 2006 </li></ul><ul><li>www.army.mil/armyimages/armyimage.php?photo=6806 </li></ul><ul><li>www.autocult.com.au/img/gallery/997gt3773.jpg </li></ul><ul><li>www.mulsannescorner.com </li></ul><ul><li>www.seriouswheels.com </li></ul><ul><li>www.topgear.com </li></ul><ul><li>www.insideracingtechnology.com/tech107bndrylayer.htm </li></ul><ul><li>http://zedomax.com/blog/2007/04/19/rolling-wind-tunnel-that-goes-at-180mph/ </li></ul>

×