• Magnetohydrodynamic Generators

    01/12/2024 at 17:35 3 comments

    Well, hello.

    I'm making this page because, for some reason, I feel like talking about Magnetohydrodynamic Generators (MHD generators for short), but I don't have any kind of project log to talk about it.

    I would want to make a new project on this subject, but let's be honest, I'm broke and not a professional in any useful area, so it is most likely I would left the project to rot and unnecessarily fill up Hackaday's memory.

    But being honest², I do feel tempted in making such project because I have a faint hope that someone more qualified than me would see and try it.

    In any case:

    Magnetohydrodynamic generators:

    These kinds of generators are just like alternators, but with no moving part and using plasma instead.

    What do I mean: alternators have electromagnets on both the rotor and the stator, once you rotate it, the disturbance in the electromagnetic field will generate energy.
    A MHD generator maintains electromagnetic fields that maintain a conductive medium (normally plasma), once a disturbance in this equilibrium appears, it is turned into energy.

    The problems:

    The first issue that one notices when researching about the subject is the lack of information and the lack of large scale applications of such generators (with the exception of being used on rocket engines).

    I can barely find any information on the subject and it always substantially changes depending on the article/news paper you are reading.

    Some websites say that the MHD generators aren't viable because they achieve plasma by superheating gases until they turn into plasma, others say it is because they need a "seeding material", which is normally a radioactive isotope of some random material that will "seed" ions on the gases, turning them into plasma.
    And finally, others say it is because it only produces enough energy if they use blasts that travel through tunnels, which need to be as strong as conventional explosions. Which is dangerous and damages materials.

    It is probably all the three and more, but the issue repeats itself: there isn't enough information on the subject.

    The ideas:

    Not knowing enough about the subject and not having enough money even to test the most basic of MHD's didn't stop me from imagining how I would do it (even though it is the most incorrect and unpractical idea).

    The first thing it comes to mind are toroidal plasma fusion reactors, or Tokamaks:

    Of course I'm not saying "Imma turn MHD's into fusion reactors 'cause it is easy", I'm saying that tokamaks are possibly a good blueprint for different MHD generators.

    But this put into question: "if they were so good as you say, then why there aren't any MHD with such shape?"

    And to be honest, I don't know and I'm probably wrong.

    In either way, I do think that fusion reactors will eventually become some type of magnetohydrodynamic generators, because it is way simpler to extract energy like this.

    Today's proposals focuses on using the heat generated that hits the walls to turn water into steam.

    Which, needless to say, seems quite... Unpractical.

    I'm not saying that I know better than the physicists that are creating these marvel of technologies, but I always question myself on how they are going to do it when the fusion they create literally and absolutely destroys the reactor itself from inside.

    If I had the capacity/knowledge/competency/budget to do so, I would try to research how to make walls of plasma.Imagine it like this: 

    Every layer in this plasma donut is a different gas being ionized, and each gas ionized helps with the fusion and protects against damage on the reactor.

    The center is obviously the hydrogen being reacted, while heavier gases like nitrogen or argon gas are used to shield the reactor's walls.

    You could maybe even use lithium gas in order to further feed tritium into the fusion reaction, since lithium produces tritium hydrogen when under radiation.

    ... Read more »

  • What is a page?

    02/17/2023 at 22:46 0 comments

    Just testing this feature