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Open Track Racing
My new heat extractor hood
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<blockquote data-quote="mu22stang" data-source="post: 11597987" data-attributes="member: 81298"><p><strong>Tuft string test 2004 Cobra hood vents</strong></p><p></p><p><img src="http://img515.imageshack.us/img515/3297/img0557i.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="http://img545.imageshack.us/img545/2967/img0571bx.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="http://img213.imageshack.us/img213/2162/img0580oy.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Some interesting observations during tuft testing: first, the tufts on the stock vent (driver side) remained attached and smooth everywhere I put tufts. The 1" tall gurney in the first pic is more or less perpendicular to air flow. The strings attached to the leading edge of the gurney actually were flowing down and into the heat extractor vent. The air was quite turbulent. I didn’t put any tufts far enough back to see if the air re-attached to the hood as on the stock side for this first round. Back to the drawing board. </p><p></p><p>The second test, I cut half of the gurney down to 1/2”. The turbulence really wasn’t reduced. The tufts were all over the place.</p><p></p><p>Third test I bent the gurney back 45 degrees (pic 2). The tufts on the leading edge of the gurney now had laminar flow characteristics, but all the other "downstream" strings showed extreme turbulent flow especially on the 1” tall side. </p><p></p><p>Fourth test I cut serrations across the entire gurney (pic 3). The tufts on the leading edge of the gurney were still showing laminar flow. The “downstream” strings on the ½” side were attached, while the “downstream” strings on the 1” side stilled showed significant turbulence. The ½” gurney, bent back 45*, and serrated showed extremely similar characteristics to the stock vents side. So close in fact, that I couldn’t tell a difference in tuft movement or angle. Essentially, no improvement in my eyes.</p><p></p><p>I initially thought that the gurney would increase the height of the “canopy” of low pressure. After witnessing the turbulence, I’m now more concerned that any leading edge obstruction will do more harm to the laminar flow over the hood. So the question I have for you guys with modified hoods (Carlos’ design(s), Tiger racing) or even better, guys with experience or training in aerodynamics, is this: what should the tufts look like on and around an efficient heat extractor?</p></blockquote><p></p>
[QUOTE="mu22stang, post: 11597987, member: 81298"] [b]Tuft string test 2004 Cobra hood vents[/b] [IMG]http://img515.imageshack.us/img515/3297/img0557i.jpg[/IMG] [IMG]http://img545.imageshack.us/img545/2967/img0571bx.jpg[/IMG] [IMG]http://img213.imageshack.us/img213/2162/img0580oy.jpg[/IMG] Some interesting observations during tuft testing: first, the tufts on the stock vent (driver side) remained attached and smooth everywhere I put tufts. The 1" tall gurney in the first pic is more or less perpendicular to air flow. The strings attached to the leading edge of the gurney actually were flowing down and into the heat extractor vent. The air was quite turbulent. I didn’t put any tufts far enough back to see if the air re-attached to the hood as on the stock side for this first round. Back to the drawing board. The second test, I cut half of the gurney down to 1/2”. The turbulence really wasn’t reduced. The tufts were all over the place. Third test I bent the gurney back 45 degrees (pic 2). The tufts on the leading edge of the gurney now had laminar flow characteristics, but all the other "downstream" strings showed extreme turbulent flow especially on the 1” tall side. Fourth test I cut serrations across the entire gurney (pic 3). The tufts on the leading edge of the gurney were still showing laminar flow. The “downstream” strings on the ½” side were attached, while the “downstream” strings on the 1” side stilled showed significant turbulence. The ½” gurney, bent back 45*, and serrated showed extremely similar characteristics to the stock vents side. So close in fact, that I couldn’t tell a difference in tuft movement or angle. Essentially, no improvement in my eyes. I initially thought that the gurney would increase the height of the “canopy” of low pressure. After witnessing the turbulence, I’m now more concerned that any leading edge obstruction will do more harm to the laminar flow over the hood. So the question I have for you guys with modified hoods (Carlos’ design(s), Tiger racing) or even better, guys with experience or training in aerodynamics, is this: what should the tufts look like on and around an efficient heat extractor? [/QUOTE]
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