Twin cylinder thermo-acoustic Stirling Engine #2

[grommdk]

but will it blend?

[105bogus]

what material is used to make a piston and what is the piston-cylinder clerance? Are brass sleeves slided on test-tubes for 'good look' purpouse only? Are test-tubes precisely round to seal the engine?

[1967geezer]

@105bogus The piston is graphite. The brass sleeves hold two separate lengths of tube together. The two long tubes are test tubes, the two short tubes are precise borosilicate tubes. Test tubes are not normally perfectly round.

[denni4job]

cud u please tell me the working principle behind this engine. also is it more efficient than the normal beta type stirling engine.. pls tell.

[steamwally]

Superb bit of machinework there, you have created a fine little engine.

My "thing" is old stationary engines, internal combustion. I started with small steam engines when I was 8 and moved up to the old farm engines. I'm becoming increasingly interested in these stirling engines.

I tried to build a small one a few weeks back and it didn't work too well. However, I should recieve a kit in the post any time now so might have a go at building another on the lathe.

Really enjoyed the vid!

[munhoeo]

Please excuse my ignorance. I undertand it's a heat pump / heat engine. But what does it have to do with acoustic? Does the sound wave/natural frequency of the chamber has something to do with the displacement? Thanks

[piespokladowy]

*****

[mimic58]

how long did it take you to biuld this engine geezer?? looks like a really nice job

[shramek5]

how did u make it

[ComradPaco]

is it two tact?

[illustriouschin]

thats a pretty sweet crack pipe

[ICgraFX]

he clearly said 450rpm

[fernandesilyt]

How many RPM?

[fernandesilyt]

If I use aluminium, the power will grow up?

*sorry my bad English.

[Natovr7]

I think the aliuminium is just to transport the ambient (background) heat into the test tubes

[pumkinvine]

Beautiful engine, superb workmanship

[zuriku]

Pretty wicked :D

[WarzSchoolchild]

A lovely model, but I am curious as to why you call it a Thermo-Acoustic Stirling Engine?.... Penn State University have loads of information on Thermo-Acoustics, and the Stirling Engines are 'Tuned'... The wavelength of the tube is critical. They work on the 'bucket-brigade' principle. molecules of gas behave like an acousic laser inside an acoustic honeycomb. The noise they make can be deafening! This looks to me like a regular stirling engine. Pardon for the quible.

[Magnetohydrodynamics]

This is not a regular stirling engine as the pistons are not connected.

[WarzSchoolchild]

It's a very fine piece of workmanship, and worthy of five stars ***** just for that. I note the pistons seem to be 90 degrees out of phase. That prevents a 'sticking-point'...at least one piston will turn the flywheel.

[mimic58]

@WarzSchoolchild Frade not , These engines are indeed thermo acoustic , The length and diameter of the tube used is Critical and affects the frequency that the engine cycles at you will find with this engine the top speed will not change regardless of the stroke on the piston or the throw on the cam.

[euro3434]

where I buy this engine?

[1967geezer]

Not for sale...

[superfunnyman123]

it would be cooler if the pistons didnt run together

[efkperez]

what material is your test tube?

[1967geezer]

borosilicate test tube

[efkperez]

i am juz curious on the test tube. time will come that the test tube will reach its limit to withstand heat, isn't it?

what's the diameter and lenght of the test tube by the way?

And with regards to the object/material inside, what is its effect to the intire system?

[efkperez]

waht is the purpose of the stainless steel pot scourer? what does it do to the intire system?

[gamesbok]

It's a heat store, in both directions.

[Rockinghorseshart]

Hi Christopher, why do you refer to this as a thermoacoustic engine? Wikipedia tells me thermoacoustic stirling engines use, "high-amplitude sound waves in a pressurized gas to pump heat from one place to another - or use a heat temperature difference to induce sound, which can be converted to electricity with high efficiency, with a (piezoelectric) loudspeaker".

Very beautifully machined engine. Did you use stainless steel or get the parts chromed?

[produKtNZ]

What is the material inside the test tube's?

[adamm666]

zajebista sprawa te silniki juz dawno powinny znalesc zastosowanie thank you for video ! great motor

[rjscott2007]

does this run just on heated air?

[kwisn]

Beautiful work, thanks for showing it to us!

[csingcsung]

Extreme

[sn1pe352]

Is this the new acoustic heat-engine that all thy hype was about?

Or did they trying/achieving to make it more efficient?

[machinedcreations]

Very Beautiful engine!! Thanks for sharing!

[NanetteW]

Thank you for showing this to us.

I don't think you are a geezer at all. ^_^

[anoceanofhearts]

Man that is possibly the most beautiful machine i have ever seen. wow! i just gotta make one of them. how can i get a plan? So very very cool.

[LightningRose]

Go to the big auction site and search for "lamina engine". The plans are for a single cylinder engine, but it would be easy to adapt to 2 cylinders.

[tarmacdemon]

@anoceanofhearts

I Totally agree a very nice looking engine .

[fre2fly]

ive herd that sometimes you need a baffle between the clyinder and the test tube bit

[fre2fly]

m8 y are both pistons going in and out at the same time

y dont you have it set so that 1 is set 1/4 turn behiend the other like on double acting steam engines??

because this type of engine is double acting

[legonoitall]

i noticed that too. The flywheels must get some momnetum to cary the pistons around again

[VisVandAt]

how is this thermo-acoustic?

[ehjones]

Hi, that's a great engine. It's interesting that they go better when in phase - it seems a bit counter-intuitive.

Did you scratch build the pistons yourself or are they commercially available?

[1967geezer]

The pistons are pure graphite turned down to fit the borosilicate glass cylinder. I work for Kontax Stirling Engines and these piston/cylinder sets are left over from a commercial Stirling Engine project.

[fuzzymonkey777]

Great video, why are the metal shavings necessary inside the cylinder? I saw your website, I would love to see your other engines in action. Thanks for posting.

[1967geezer]

They are stainless steel kitchen scrubbing brushes...

[PalmRunner]

Hi, congratulations for the nice engines you built there! I've checked your web site as well. Amazing things! I have few questions:

1. Have you tried to diphase both pistons by 180 deg? If the power is not the same for the inward and outward piston stroke, diphasing the pistons by 180 deg may increase the power and would bring better balanced flywheel.

2. Have you measured the engine power and ... does using two engines working in parallel produces double the power of one?

[1967geezer]

Hi, thanks for your comments. I tried opposing (diphasing) the pistons when I first assembled the engine, I too thought the balance would be better. Well, the balance was better but it ran significantly slower than I was expecting, when I put them both in phase it ran just as expected. I haven't measured the power, to be honest I wouldn't know how to. I wouldn't think that you would get double the power for a twin cylinder, maybe 1.5x or something like that.