Viresaero-movable wing surface?

Discussion in 'Hydrodynamics and Aerodynamics' started by Doug Lord, Dec 12, 2013.

  1. Doug Lord
    Joined: May 2009
    Posts: 16,675
    Likes: 340, Points: 93, Legacy Rep: 1362
    Location: Cocoa, Florida

    Doug Lord Flight Ready

  2. daiquiri
    Joined: May 2004
    Posts: 5,373
    Likes: 252, Points: 73, Legacy Rep: 3380
    Location: Italy (Garda Lake) and Croatia (Istria)

    daiquiri Engineering and Design

    It is an application of a moving surface to a lifting body - in this case, an airfoil. Not a new technology, and I strongly doubt can pay-off the costs of installation, maintenance and added weight on an airplane. You can read something more about moving-surfaces and their use in this recent thread: http://www.boatdesign.net/forums/hy...e-boundary-layer-control-hydrofoil-48886.html . Everything I wrote there remains valid for this application too.

    Frankly, the only thing that impresses me on their web page is gorgeous Ms. Kristen Gallogly. The rest is unconvincing at best.

    Cheers
     
  3. tspeer
    Joined: Feb 2002
    Posts: 2,314
    Likes: 288, Points: 83, Legacy Rep: 1673
    Location: Port Gamble, Washington, USA

    tspeer Senior Member

    Their video depicts a very low Reynolds number flow, judging by the thickness of the boundary layer. I don't think you'd see eddies that big on the Global Hawk they depict.

    I can't find anything on their website that says what their product actually is. But it appears to be a moving belt type of boundary layer control. Such systems have been used for a long time in wind tunnels to simulate ground effects, because it avoids the buildup of a boundary layer along the ground board.

    Most moving wall boundary layer studies have looked at rotating cylinders along the leading edge, such as https://circle.ubc.ca/bitstream/id/98948/UBC_1988_A1 M64.pdf‎. A moving belt would probably boost the maximum lift a bit more compared to cylinders at the leading trailing edges, but it would be interesting to see how competitive it is with Fowler flaps.

    I'm skeptical about how beneficial it would be with regard to reducing cruise drag, especially if one considered putting the same power into propulsion as is used to run the belt.
     
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.