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Wing flaps: Increase/decrease flow separation at low speeds?

  1. Jul 6, 2015 #1
    Hi all,
    I was just reading about airplane flaps. From I what I understood, they increase lift and drag (at lower speeds) to help land the aircraft.
    Do flaps also reduce the tendency of flow separation at lower speeds?
    Let's say we have an airplane wing with no flaps (Case I) and airplane wing with flaps (Case II)? At lower aircraft speed does the case II help in avoiding flow separation or it will increase flow separation?

    What about slats? Do they reduce the flow separation at lower speeds?

    Thanks
     
  2. jcsd
  3. Jul 6, 2015 #2

    FactChecker

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    If they cause separation, they are being used wrong at too high a speed.
     
  4. Jul 6, 2015 #3

    OCR

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    Last edited: Jul 6, 2015
  5. Jul 6, 2015 #4
    Yes they increase lift and drag. which is exactly what you want for the safest landing.
    Not to the point where the flow over the wing becomes unstable though, that's a stall.
    Lift gone, but still much drag.

    Flaps do most of the work; the leading edge slats are a more recent development which help keep the airflow stable at lower speeds.
     
    Last edited: Jul 6, 2015
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