Transparent NASA type free piston Stirling Engine in action!
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- Опубліковано 14 жов 2024
- #stirling engine, #freepistonstirlingengine, #nasastirling
Transparent NASA type free piston Stirling Engine in action
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My transparent NASA type free piston Stirling engine is runned smooth and quiet. Pretty cool how we can see the system at work! :)
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Hi, how do you make sure the phase shift (between working piston and displacer piston) is correct with this design ? In this design both pistons are linked like a gas spring.
In conventional design the phase shift, (for example 60° in low temp Stirlings or 80-90° in higher temp. Stirlings) is controlled by a likange system.
I would like to design a small free dispalcer stirling engine and therefore need to know how I would design those parameters optimally.
Thank you
@sierraecho884 Free piston units are selftuning. It could work with not perfect parameters too, because the piston phase shift change automatically. The real cycle phase shift is not equal with the piston's phase shift. Cycle happens in the regenerator section in every hot air engine that use regenerator. Linkage system units are only shows a phase shift for your eyes. Thermodinamically the system has different phase shift. That is why sometimes a finished unit could work better with 85 or 105 degrees linkage phase shift. The 90 degrees is not a rule but that 90 degrees is a correct phase shift when you draw the real gas diagram with vectors. You will get 90 degrees. Just think about 120 degrees 3 cylinder systems. The linkage gives 120 degrees optimally, but the cycle works with 90 inside. Basically this unit is not optimal, because of the displacer membrane has too high surface. It could be 1/3rd of the diameter of the power piston cca. Rule of thumb. :) BLADE
@@AttilaBlade Yes, but this can lead to negative resonances too which you will not have any control over because you can not change the phase shift. Are you saying a free piston chooses it´s best possible phase shift automatically through pressure ? Because this is what I was hoping happens but I am not sure.
"...Cycle happens in the regenerator section in every hot air engine that use regenerator..." So you mean, depending on the resistance in the regenerator, gaps, loses etc. the cycle auto tunes itself with a free piston engine, right ?
"...Thermodinamically the system has different phase shift. That is why sometimes a finished unit could work better with 85 or 105 degrees linkage phase shift. ..." Yes I have watched German and Swiss stirling engine companies explain that in a symposium. Alpha Stirling needs way more than the 90° phase usually while Beta and Gamma stirlings work between 60° in low temp engines ca 40°C-60C° delta or about 80-90° phase shift with more heat and more speed maybe 400C° delta. I can link you the video, sadly it is all in German but maybe you can autotranslate etc. Or just look at the graphics.
I really wich I could talk to you person to person, it´s difficult to communicate via UA-cam.
@@sierraecho884 In a model unit we can not solve the parasite resonances, but the working main frequency is automatic as the phase shift too. The working temperature and the density of the regenerator could change the phase shift also the type of the Stirling engine. But, some high school research group goes to the wrong direction. Because they are not optimise the unit parameters only change the phase shift and measure the output datas. if the unit wasn't optimised earlier then we will find a more optimal linkage phase shift. We can increase the power and the efficiency more with the optimal heat exchanger, (close to the thermal penetration depth, high surface, low void volume in), the optimal regenerator (mass, wire thickness, porosity, parallel plate structure, low as possible void volume in) etc. etc. etc. one parameter is only one parameter. That is not change everything, just partially. I want to watch that german video if you don't mind. Please send me the link! You can write me an email if you want. BLADE
@@AttilaBlade Thank you for taking the time to respond to my questions. I have forwarded the video link to you in my last comment, I hope you find it interesting. I can assist you in the translation if you like.
When I started to gather information about the Stirling motor and it´s alpha beta & gamma configurations I liked the beta configuration the most for it´s small footprint and small dead space (short connection between the 2 cylinders). The part I didn´t like was the rhombic drive, since it´s complex, needs to be precise and has a lot mechanical losses. Naturally the next step would be to change the rhombic drive and I found the free piston design and also your channel ( great work btw).
I am a mechanical design engineer by trade, so I though I might create my own small engine. I would like to 3D print all non heat sensitive parts with my FDM 3D printer. I am even thinking of metal laser printing the hot parts of the engine as well in stainless steel but only if the concept works since DMLS is expensive.
My goal is a small demonstrator which can charge a phone. ca. 5W-15W output. I want to make it as simple as possible, cheap, small, easy to produce and as efficient as can be without the need of complex manufacturing.
:)
Thanks for your watching!
I hope you will show that new engine!
Greetings from Hungary!
Blade
Gratulálok ez egy szuper gép.
Hi there!
Thx!
I need to build a linear alternator, but not air coil. I need to use some iron base there, because the energy is more times more than without! Also I need to pump it up with air nearly 3 atm later maybe more...
It is a big challenge!
Very good design!!! impressive simplicity. Congratulations..
In the step by step video it shows that it can move (lift) quite some weight.
The lack of moving parts is just to bizar and makes it a very reliable little engine.
I watched the videos again, I am still as impressed...
Yes the displacer can has a pin hole originally, but the holder cut the membrane out on the top.
The shaker power generator is a possible way here.
Köszönöm! De ennél még jobb is lehet majd, ha sikerül rendesen megépíteni!
Muy bueno ... El aporte que te puedo dar es si le pones un eje dentro del centro para que se desplace libremente y tenga una guia vas a evitar que se mueva hacia los lados,.......Gracias por compartir tu motor
Wow! I see what you mean.
How about a linear bearing at the output,and a arm to a flywheel,and finally a step down gear to lift a weight?
Congratulations for this design. I find it interesting that I am not considering this engine as devoted to one action but basically there are two systems linked with each other. The top mass has its own differential equation LINKED to the differential equation of the displacer. When the phase shift is correct the input from the displacer to the top mass renders it to vibrate and in turn the vibration of the top membrane will affect the displacer each keeping the phase synchronized to keep the combined system working so harmoniously. Again well done and it is a beautiful function, not to include the beauty of the thermodynamics being involved and the dynamics of the fluid curling and diverging in that jar. Beautiful in many ways which no artist can appreciate except through the mind of an engineer who can appreciate invisible and silent beauty of our universal functions. Again Sir, my congratulations, I am really touched by all the combined functions taking place in that transparent jar.
Carmel Pule' Thanks very much your kindly words! I really like this simple construction, because it's effective and it has long life with low noise if the calculations are right! Thanks for your comment! Kind regards! Blade
Wow, thanks for all your great work!!
What's the use of the black sponge under the power piston? thank you!
Köszönöm! Igen, én is meglepődtem milyen sokáig, majd 3 percig simán mozgásban volt.
Megjósolni sem merném, hogy mit tudna rendesen megépítve és meghajtva!
Ez a design kimondottan a gép működésének megértése miatt készült.
Minden jót!
Not yet, but you know...this is a really simple design. If you will be watch this video, or my other one on a bigger screen, then this engine will be crystal clear for you!
Yes it is! :) I like this design, because really simple, cheap, but powerful! :)
Kind regards!
Understood. Gotta start working. Greetings from Spain =)
wow all that with just a candle.
Nice running, thanks for sharing!
I like the simplicity and transparency to see internal working. Seems to have over 100° phase shift... with high frame rate camera to check it out with slow motion?
Challenge will be to get useful power out without destroying the free wheeling running:
Water pumping with engine air pressure variation?
Ironless PM linear alternator?
Szia, köszi!
Igen, ez is egy magyarázata, de a reális közelítés, (mivel ezeknél a gépeknél nem kell ekkora kiszorító dugattyú eredendően) az, hogy a nagy felületen még mindig elég nagy nyomásváltozás keletkezik a mozgáshoz.
Kis dugattyún ekkora lyukkal már biztosan nem menne!
okay thanks very much :) And would you advise a 100% steel wool displacer or a tube/can with a layer of steel wool around it?
Also as I am trying to replicate this exact engine (as it seems so efficient compared to my regular gamma type starlings!) would you be able to give me any details about the displacer you made for this transparent free piston engine?
Much appreciated!
If you can make, than just twist around the displacer's tube with steel wool.
The parameters will be change if you can use a wrepped diasplacer, because the transparent engine has so long displacer to reduce the heat conduction to the cold side. I prefer the 3 times longer displacer then the diameter.1. third for the heating, 2. third for regenerating, 3. third for cooling. This is my basic geometry of this engine. The stroke should be 1/3 length. And hold on the middle line.
Thx! :)
I hope it is just the beginning!
Ez igen! Nagyon látványos!
Elég tekintélyes mennyiségű súly van a tetején.
Szerintem a kiszorító azért is működik a lyuk ellenére is, mert a rugóra függesztés miatt olyan mint a hinta, ha már mozog csak kicsit kell lökni, hogy mozgásban maradjon.
Wow... your AFP Stirling (size as it is and amount of heat added) wants to do some serious work..
By far more effective as what I have seen on the net for years.
Very impressive..
Ez igaz. Viszont lehet, hogy egyszerűbb a membránt ugyan így tartani, és a kiszorító egy részét lezárni, hogy ne hassanak ekkora erők a membránra. Ha van az embernek megfelelő alkatrésze, biztosan hatékonyabb az amit mondasz.
Egy kisebb dugatyúval viszont nem lehet megjátszani ezt a zseniális kitöltést amit itt összehoztál!
wow
The pin hole on the can was in the plan! I used it lot of times yet and it is worked well.
But the hole on the top membrane was an error. The holder was too sharp there, and the stroke was too big.
The holder is cut it off bigger and bigger in every 1/13th second! :)
But it is not a big problem for this engine as you can see, because the membranes dimensions ratio is nearly 1:0,75 and this engine is also working with 1:0,33 ratio...so the displacers membrane with hole just closer for this ratio
Thank you very much! :)
Thanks for you comment!
Best regards from Hungary!
Nice and quiet, good pace too, I guess allot of time in this one :)
The tiny gap is the regenerator here, between the cylinder and the long displacer.
The free style engines has a better efficiency.
hello, amazing engine so simple!! I am currently trying to build a similar free piston engine and was wondering what this particular displacer is made out of? Also, could a steel wool displacer work as well or would this be too much weight?
Thanks!!
Dear Attila, i forgot to mention that using helium instead of general atmospheric gas will make it very efficient! pierre
How could you keep the helium inside, it's got a pin hole.?
well done
Is it possible to make this as a low temperature differential engine? Or because if the rubber membranes there will not be enough power to move it?
Yes, it is possible! This one was close to that, but I never tried. If the unit geometry changed to a pancake like or just more wider it could work with low delta T easily. I'm working on an LTD NASA engine. I hope it will ready to show you soon as possible. BLADE
@@AttilaBlade You are brilliant! Can’t wait to see what you come up with next!!
@@sreenathc It will coming, but now I'm actually working on hardly to the background of an Autumn Stirling Challenge on YT. I wants more subscriber and watching time but I wants to highly shake-up the community to make something. It will be a Hot Air Engine Builder Challenge to win a pretty nicely machined pricey engine. Details coming soon! BLADE
Hi there!
Thanks very much!
The performance is much more better if you can use some steel wool as you can see my video AFP Stirling developing step by step!
Greetings from Hungary!
Blade
I shall try making one like this next...
This type Stirling is not so sensitive as the TASHE is. I have two different tutorial for this. I don't know what soft cans that you can buy. But these are works with same diameter other cans I think but to create the inner fixation point and the membrane will be a bit different. Much easier to make as the TASHE and start with at lower heat.
Sounds good.
To compensate cogging there (torque variation when magnets attracting to iron) is really hard - that add poor running and noise to othervise silent and fluent machine.
Only good properties of iron are aimed for manufacturers:
1. material price and 2. flux concentration (higher permeability) for making smaller and cheaper e-machines.
- no other operational or user advantage with use of iron in electrical machines: only losses, weight, bad behaving and endless compromises...
Imagine what this would do pressurized.
It could make more power, but the parts are just glued together, so, it could build up with stainless cylinder, and stronger membrane.
Hmmmm I thought so, but I was wondering if you could have arranged the displacer in another way that wouldn't make the sponge neccesary, but anyway the truth is that your engine runs beautifully.
Seriously, I gotta try and build one of your designs.
By the way: it seems that there are more LTD ringbom/free-piston engines than regular crankshaft-and-wheel engines. Are Ringbom and the free-piston type more powerful? do they have a better efficiency than regular stirlings? Thanks!!
A kiszorító egy része most is le van zárva, mert a dobozban fémszivacs van teljes hosszában elég sűrűn.
Cheers!
Is there a detailed how-to for this? I would loooove that! =) Thanks in any case!!
That is a dense material, but simple crash safety plastic sponge from a transport box.
You mean, polystyrene? Won't that just melt?
@@Skoda130 Not polystyrene, just simple fine, dense sponge, but I think that works well too, because that place is cold!
¡Gracias! Tengo otra máquina para crear un trípode.
Dear Attila sir, this is most wonderful ! Will you be showing how to make.Many blessings, pierre from New Mexico
Dear Pierre,
THX! I hope you found yet, my instructions in two different version of my FPSE engines!
:)
Yes, I did sir, thank you. :) pierre
:)
I will make a video soon.
Be patient!:)
Would it be possible to replace the Poston with a magnet and wrap a wire coil around the glass to produce electricity?
The power piston could make electricity if there is a Neodymium magnets and around some coils connected series.
Dude, what moves the displacer?
Alright, i got it...
But does it work as a regenerator?
I am trying to achieve 40% efficiency with one of these. Also i need it to run of maximum 50 degrees Celsius temperature difference between the hot and cold sides. I will use linear generator to make electricity to run a 300W load. I'm planing to make it alot bigger, maybe even split it in to 2 or more engines. I love your design BTW! It is verry demonstrative!
Thanks!
That will be a huge engine with high pressurised gas! :)
Yeah, i plan on making a better regenerator and a high effitiency linear generator all sealed in about 50 atmospere vessel... I also concider a diferent gas in the engine, someting with higher temperature expantion coeficient.
Impossible! If you're talking in total efficiency at least. Maximum Carnot efficiency is 1-Tc/Th
Which for 50 degrees celcius gives an efficiency of 15,5% with a cold side at 0 degrees C.
Effectivity...relativistic yet.
I'm not really sure the power of this engine.
But I think this is the simplest engine what I built.
Igen az eredeti 85g-tól éppen csak elindult. Ezen most majdnem 300g dolgozik!
what is the lowest temperature difference this engine could operate at please?
PrayForWales I'm not pretty shure, but approx 100-150 C
Attila Blade what is it about the design that sets those parameters?
No! That is just a dead volume reducer part!
:)
Can you send me 1
Yes I'm serious can you send me one of those I'll send you my address
:)