Air Intake Duct Types

  1. Questions:

    1. Passive air intake (no fan) body moving under 100 mph, which air intake is most efficient?

    2. Active powered fan situation, body moving under 100 mph, which air intake system is most efficient?

    3. Please direct me to an on-line source of information which explains when, where and why.

    http://i184.photobucket.com/albums/x295/kach22i/Intake-Duct-Types-2.jpg
     

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  2. jcsd
  3. Not exactly right out of my sketch book (and wall of clay models), but similar. I can see some of the Joint Strike Fighter layout being doubled here and scaled down.

    http://www.rutherford-research.ca/rrx/aerospace/aerospaceDesign.php
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    Nuclear UAV's? :blink:
     
  4. I found this today............on waterjets.

    http://marinejettech.com/IntelliJET Development History.htm
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  7. Every now and then I pick up a little more information, however this one is difficult to absorb (for me).

    S-Duct Inlet
    http://www.grc.nasa.gov/WWW/wind/valid/sduct/sduct.html

    S-Duct Inlet: Study #1
    http://www.grc.nasa.gov/WWW/wind/valid/sduct/sduct01/sduct01.html


    http://engineers.ihs.com/news/newsletters/esdu/esdu-issue11-05.htm
     

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    Last edited: Aug 24, 2007
  8. FredGarvin

    FredGarvin 5,087
    Science Advisor

    The operative words in what you quoted is pressure recovery. For a duct design that is the one of top hitters in terms of importance. Distortion is probably the most important.
     
  9. Thanks, I'll do some Googling of those terms.

    Maybe I should just purchase a text book on the topic, I'm a block from U of M, go Wolverines!
     
  10. Danger

    Danger 9,878
    Gold Member

    For any of the conditions set forth in the first post, I would think that the gooseneck would be best. A couple of hundred thousand car racers can't be wrong, and almost all automotive scoops are of that basic configuration. (I'm not sure how velocity stacks compare, though.)
     
  11. P-51 Mustang, F-16 Fighting Falcon................fancier words and functions than Goose-Neck and I'm sure they are the most efficient at relative speeds.

    I'm truely interested in the louvered vents (bottom image), the likes of which we have not seen since the Porsche 550 Spyder (James Dean's car) of the 1950's and early jet fighters.

    The vents we see today which are to let pressure out of wheel wells or the heat out of engine bays are in opposite direction and use than I'm interested in.
     

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  12. The hunt is on........................pressure recovery.

    NACA Ducts
    http://members.aon.at/wrathall/rotary/72_Engine/72-47 NACA ducts.htm
     
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