Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Air Intake Duct Types

  1. Jul 24, 2007 #1

    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.


    Attached Files:

  2. jcsd
  3. Aug 9, 2007 #2
    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.


    Nuclear UAV's? :blink:
  4. Aug 15, 2007 #3
    I found this today............on waterjets.

    http://marinejettech.com/IntelliJET Development History.htm
  5. Aug 20, 2007 #4
    Just adding to the collection, comments anyone?

    http://www.aiaa.org/tc/vstol/unbuilt/breguet/index_a.html [Broken]

    Attached Files:

    Last edited by a moderator: May 3, 2017
  6. Aug 21, 2007 #5

    Attached Files:

  7. Aug 24, 2007 #6
    Every now and then I pick up a little more information, however this one is difficult to absorb (for me).

    S-Duct Inlet

    S-Duct Inlet: Study #1


    Attached Files:

    Last edited: Aug 24, 2007
  8. Aug 24, 2007 #7


    User Avatar
    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. Aug 24, 2007 #8
    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. Aug 24, 2007 #9


    User Avatar
    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. Aug 24, 2007 #10
    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.

    Attached Files:

  12. Aug 24, 2007 #11
    The hunt is on........................pressure recovery.

    NACA Ducts
    http://members.aon.at/wrathall/rotary/72_Engine/72-47 NACA ducts.htm
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook