this might be retarded but i can't help but ask.

this might be moronic but i can't help but ask.

could you put something like a firearm suppressor on a jet engine to reduce it's noise output and heat signature?

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  1. 1 month ago
    Anonymous

    You'd be sapping energy from the exhaust which is what gives the plane its go.
    Also shits hot.

    • 1 month ago
      Anonymous

      so there's no way to control the noise an engine produces without decreasing its performance?

      • 1 month ago
        Anonymous

        An engine? Or a jet engine? Do you think all engines work the same way?

        • 1 month ago
          Anonymous

          a jet engine. no i don't think that but i have been looking into building a miniature engine for experimenting with suppressing noise on them. i was thinking i could do something with rotating detonation engines and putting a suppressor-like arrangement behind them that can actively adjust its geometry.

          • 1 month ago
            Anonymous

            ...yeah. Start with building a jet engine that works. You know, at all. Then once you have that you can start worrying about pushing the bleeding edge of jet engine technology in mom's basement.

          • 1 month ago
            Anonymous

            >i was thinking i could do something with rotating detonation engines
            That's an ambitious undertaking coming from someone asking if you can put a silencer on a jet engine

            • 1 month ago
              Anonymous

              Don't you dare to shit on the dreams of this wholesome moron.

              a jet engine. no i don't think that but i have been looking into building a miniature engine for experimenting with suppressing noise on them. i was thinking i could do something with rotating detonation engines and putting a suppressor-like arrangement behind them that can actively adjust its geometry.

              Be that man. Build that engine.

          • 1 month ago
            Anonymous

            >i was thinking i could do something with rotating detonation engines
            You realize huge government funded space programs have been struggling with this for decades right?

            • 1 month ago
              Anonymous

              Naw, let him cook

            • 1 month ago
              Anonymous

              There's literally ZERO red tape in anon's mom's basement, Congress doesn't have to approve shit.

      • 1 month ago
        Anonymous

        there is. it's called high bypass ratio.

      • 1 month ago
        Anonymous

        The engine's noise basically comes from the fan, the turbine inside and the high-velocity exhaust exiting the nozzle. Some fan noise is probably inevitable, but modern civilian engines do make some efforts to at least reduce the turbine noise exiting the nacelle.
        The exhaust can also be quieted a bit, or at least made less annoying, with careful shaping of the output nozzle. I guess these designs basically try to emit more broadband humming noise and less air horn -like screaming.
        Look up "A History of Jet Noise Research at the National Aeronautics and Space Administration" if you want to read about the topic.

      • 1 month ago
        Anonymous

        Sure there is, just make the air flow slower, basically this

        there is. it's called high bypass ratio.

        If you want to go fast though, you are also going loud. And if you go supersonic the engine noise is the least of your worries anyways.

      • 1 month ago
        Anonymous

        Some kind of hybrid or dual powerplant craft where jet propulsion takes it up to the speeds where a ramjet can take over the duties

    • 1 month ago
      Anonymous

      This plus most of the sound comes from the intake side.

    • 1 month ago
      Anonymous

      A silencer and a muffler are the same thing anon
      See
      For why they don’t put them on planes

  2. 1 month ago
    Anonymous

    Sure, it would just be so big and heavy that the airplane can't fly anymore.

  3. 1 month ago
    Anonymous

    Jet engines actually have their own type of "silencers", which look like these squiggly things that are put on the nozzle.
    The idea is that they generate a shroud of turbulent air around the jet wash which absorbs some of the noise. The disadvantage is you can't put thrust reversers if they are installed.

    • 1 month ago
      Anonymous

      Here is a more modern version of that concept.

  4. 1 month ago
    Anonymous

    Jets use hush kits which are funky looking tailpipes. high bypass turbo fans dont need them because the fan air helps dampen the sound of the turbine.

    • 1 month ago
      Anonymous

      wouldn't it amplify the dampening effect to use both options? even if the high bypass does some dampening, the hush kit could be optimized to catch what's left right?

      • 1 month ago
        Anonymous

        High bypass turbofans dont lend themselves well to any kind of tailpipe attachment because of the shape of the engine.

        https://i.imgur.com/IxltjSG.png

        Here is a more modern version of that concept.

        Shows what they do with turbofans. It doesn't look like much but it does have an effect.

  5. 1 month ago
    Anonymous

    you need that for thrust

  6. 1 month ago
    Anonymous

    Why minimise engine noise when you can maximise it?
    >pic very much related

    • 1 month ago
      Anonymous

      It lives at the air force museum in dayton now. For any Anons who haven't been, you should check it out. Its free and has a lot of cool aircraft that get posted on this board all the time.

  7. 1 month ago
    Anonymous

    >this might be moronic but i can't help but ask.
    I have my own moronic question to ask.

    Why do we always show guns shooting right to left but jet engines thrusting left to right?

  8. 1 month ago
    Anonymous

    There's almost no point commercially. Probably not the best solution out there. You can't hear planes past a certain altitude, just reread what the frick you wrote and you might realise you are moronic.
    >Big giant silencers on jet engines.
    You damn moron.

  9. 1 month ago
    Anonymous

    High back pressure designs would be a very bad idea. Low back pressure designs like the pass through suppressors would probably be doable but they'd be absolutely huge, heavy and the plane would not fly right without being built around it and that would involve a lot of compromise.

  10. 1 month ago
    Anonymous

    >Airbus has lifted the veil on its Low-Observable UAV Testbed (LOUT) program, which it has been working on in “Skunk Works”-like secrecy since 2007.
    >LOUT is intended to demonstrate a holistic approach to low observability, including signature reduction in radar, thermal, acoustic, and visual domains, as well as the use of electronic countermeasures and electromagnetic emission control.
    I assume there are some ways you can reduce acoustic output in some niche applications. In general it's more interesting for civilian jets than military ones though.

    • 1 month ago
      Anonymous

      I suppose engine exhausts on top help alot.
      You only care about the sound that goes down to the ground after all.

  11. 1 month ago
    Anonymous

    B2s are insanely quiet

    • 1 month ago
      Anonymous

      > why i can't hear a plane coming at me that moves slightly below the speed of sound?
      physics. learn it.

  12. 1 month ago
    Anonymous

    >hey guys can I put a muffler on a jet engine?

    Go for it, anon. Post results.

  13. 1 month ago
    Anonymous

    At first I read this as
    >can you put turbine on gun as a supressor
    If you could manufacture one hell yeah you could, ignore the complexity and the weight for a second. It would be pretty effective too if done right because the expanding gasses will be converted into inertia by rotating the turbine. Hell you could fricking put a generator and a lamp on it too

    • 1 month ago
      Anonymous

      Now I'm imagining a suppressor that makes a funny VWEEEEE sound when you magdump.

    • 1 month ago
      Anonymous

      Now I'm imagining a suppressor that makes a funny VWEEEEE sound when you magdump.

      Once metal 3D printers become more available to the average person I'm going to try that. Don't worry, I'll post it on /k/

  14. 1 month ago
    Anonymous

    they already have silencers since airbus invented them for the a300s
    before them planes usually could produce at takeoff at around 144-152db
    now its 130 to 140 and at cruise below 100

  15. 1 month ago
    Anonymous

    >this might be moronic
    I'd like to call you moronic, because I intuitively feel this a fricking moronic idea, but I'm too moronic myself to actually explain why you're moronic.

  16. 1 month ago
    Anonymous

    I'm sure you could make a sound suppressed engine, but it'll come at the cost of performance. Sound isn't really that important for jets because they go so fast. Most jets will be traveling 2/3 the speed of sound minimum as they approach a target. That means by the time you hear it, they're only 1/3 as far away as the sound travels. Really not enough warning unless your engine is loud enough to be heard 50+ miles away.

  17. 1 month ago
    Anonymous

    the MIT metamaterial thing reduces sound would work. it's just a circular path around the edge that's half the wavelength of the sound.

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