Thermoacoustic Stirling engine : The power extraction unit

I show how the acoustic power of the thermoacoustic Stirling engine can be converted into electrical energy and the development steps so that anyone can build the motor for his own cheap energy using just a simple 3D printer.
If you want to support me you get access to exclusive content: https://www.patreon.com/c/Stirlingengines https://www.youtube.com/channel/UCie-_1q_BTL_cpPN_6f0gHw/join
Thanks to Baptiste (alias OfficialyMax) we now have a Discord server: https://discord.com/invite/TDABS5z2mT
It would be very nice if we could discuss there everything about Stirling engines, 3D printing and more, thank you very much Baptiste.
The vision of a simple, reliable, and powerful generator for self-generated energy is getting closer and closer.
Your many great ideas, and in some cases fully developed designs for key components, shared on Discord, in the comments and via email, are fantastic and are helping the project to progress quickly.
The powerful thermoacoustic engine, made from self-printed components and just a single commercially printed metal or ceramic heater, is taking shape more and more clearly.
Many details are still uncertain, and the best solutions for the various requirements have yet to be found.
In my latest videos, I've shared the details, blueprints, and 3D models of the power core and the feedback loop.
Now, we will move on to the power extraction unit, which converts acoustic energy into mechanical and electrical energy.
To generate enough energy during the winter and during extended periods without direct sunlight, a generator powered by self-produced biogas, for example, is a useful addition.
Unlike complex and high-maintenance mechanical engines, the construction of the thermoacoustic engine requires almost no expensive machinery or specialized knowledge.
The aim is to design the engine in such a way that anyone with an affordable 3D printer can build the generator themselves.
Only the heating unit and regenerator from metal or ceramic needs to be ordered from a 3D printing service.
Even plans are already underway for own 3D printing of ceramics, which is relatively inexpensive but requires a great deal of experience for the burning process.
This video covers the power extraction unit.
This power extraction unit is a key part of a successful thermoacoustic engine.
Since the components responsible for converting acoustic energy into mechanical energy and then into electrical energy are the only moving mechanical parts, the quality and durability of the motor depend on them.
A wide variety of methods can be used for this purpose.
The power extraction unit should be as low-friction, low-wear and low-maintenance as possible.
It should also be compact and scalable in terms of performance.
It must integrate well into the housing to handle the upcoming pressurization and, ideally, also be suitable for starting the engine.
So far, I have experimented with the bidirectional impulse turbine, oscillating stepper motors, a crank-slider mechanism, and various linear generators.
Right at the moment, I think the principle of reluctance is very interesting; it could be a very simple and elegant alternative.
To do this, I still need to run extensive simulations using FEMM to determine whether this approach can also keep up in terms of performance.
At the moment, I am conducting extensive experiments with various plastic pistons, which, due to their lower mass, not only cause less imbalance but also deliver a significant boost in performance at frequencies that are sometimes twice as high.
Additional tests involving energy recovery through spring-mounted piston end stops further improve performance.
Further considerations for simplification and improvement include new ideas for balancing the system, such as using two power units in opposite directions that are rotated by 90 degrees, and employing a membrane or diaphragm instead of a piston.
Thanks to your help, all components—except for the hot section around the heater—can now be built using simple 3D printing or readily available standard parts.
That is why intensive development work is now underway on a printed heater made of metal or ceramic.
It might even be possible to print and burn ceramic parts yourself using affordable means.
Which power extraction unit do you think holds the most promise for future development, especially in light of the upcoming pressurization?
Right now, I'm favoring the idea of a reluctance linear generator, possibly in combination with a membrane or diaphragm.
As always, I’m really looking forward to your feedback, ideas, and suggestions in the comments and on Discord.

Thanks for watching!


Thanks for the background music:
Song: Jim Yosef - Eclipse [NCS Release]
Music provided by NoCopyrightSounds
Free Download/Stream: http://ncs.io/eclispe
Watch: • Jim Yosef - Eclipse | House | NCS