Stirlingengineforum.com

My old steam thermoacoustic engine: https://1.bp.blogspot.com/-5Ua7opwlOfU/YKsJKwA2rQI/AAAAAAAAFng/lmK9FbA347E-5Ia9Im9Za_1WTjiYOg4AwCPcBGAsYHg/s320/egyszeru.jpg , https://1.bp.blogspot.com/-R_PUDw4Kpi8/YKsJYSfJZ5I/AAAAAAAAFnk/usEcBOSgfSYg3H8of4yXGAIaCkqHXuUMgCPcBGAsYHg/s320/IMG_0003.JPG an experime...

I get the idea of compression and expansion with phase change, but the significance of any "acoustic" element escapes me. The term "acoustics" is somewhat of a misdirection. Acoustics are merely kinetic wave dynamics, and that may or may not have anything to do with audible soun...

I'd share a link to the full version of that paper, but I hesitate to do so since it sounds like Daemon's original account and posts were wiped, and he was the one who originally shared it. I don't want to suddenly disappear because of sharing something like that in case that's what happened. Howeve...

Yeah sure, I'm on vacation over seas atm, but I'm taking some time to work on it. I've got a mill, lathe and a few engineers from Siemens here interested in helping me get a piston model running. So I'll probably have some great insights to post to my channel next week. Awesome! I recently tried us...

> Trichlorofluoromethane R-11 refrigerant One problem that almost any alternative fluid introduces is the need to always keep the engine totally sealed, given that these fluids are usually either poisonous or flammable or both. The nice thing about water is it's plentiful and nontoxic, therefore it ...

My guess is Tristan's engine isn't thermoacoustic but is actually an alpha Stirling engine. Here's the video where he shows the internal workings: https://www.youtube.com/watch?v=CXsFNPmjluo (curse YouTube for continuing to make finding old videos an incredible pain) I don't know why he called it a ...

> Is it concussion from steam explosions? I don't think so. The engine will continue running despite a lack of boiling once it's been removed from the heat. In my experience, it may do this anywhere from 10 seconds to even a minute. Honestly, I think the boiling and steam flashes are a red herring. ...

I've now confirmed that it's absolutely feasible to run the engine continuously for at least an hour, and likely much more so. As I think I've already mentioned, the key is really about maintaining a balance between the input and the output. An external combustion engine shouldn't really be that dif...

I had some modest success with a diaphragm made of parchment paper. Sounds just like a two-stroke!

https://www.youtube.com/watch?v=T_-j91E6CCQ

I really need to get a needle-syringe and try the flash boil approach. It makes me wonder if the engine could benefit from a "carburetor" of sorts that sprays small amounts of water into the boiler as a result of the fluctuating pressure.

Something I would like to point out though, this engine produces a lot of power with very little heat when you have everything tuned in correctly. At one point I started the engine with 3 tea lights, which overpowered it realy fast, so I had to run it with 2 tea lights and even then I had to be car...

Oh yeah, so there's a few things I want to hopefully get to testing out this weekend. Building a clear version of this engine might be helpful in visualizing what's going on. I'm thinking I want to give my hand a try at cutting some glass cylinders out of wine bottles and see how that goes. If I can...

Yep Tom, you're right on the money. There's a kind of tradeoff and balancing act going on here between efficiency and how long the engine can operate at a given rate of heat transfer. The engine doesn't necessarily need to be cooled, nor is that cooling necessarily a good thing for fundamental opera...

@Tom Booth Interesting findings around the Leidenfrost effect! In a weird coincidence, I was actually saved from a burn a couple of days ago by the Leidenfrost effect when working on this engine. My hand was dripping wet from the sink and the back of my hand lightly touched a very hot surface, but a...

Very nice! The engine does seem to need to be kicked off before it can be sustained with lower power. I've been able to keep mine running indefinitely with a mini butane torch lighter. Also, I tried swapping out the rice with aquarium gravel and it works quite nicely. I think I'll be using that from...