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Post by martyn on Feb 12, 2023 13:13:38 GMT -8
Only this little bit of the best format, every little change has some other effect, why are there flames in the air channel, maybe the wood or maybe the increased volume of the afterburner. |
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Post by Karl L on Feb 12, 2023 22:54:24 GMT -8
why are there flames in the air channel, maybe the wood or maybe the increased volume of the afterburner. It looks like the flames in the air channel are gas leaking up between the firebox roof sections, then igniting in the secondary air. |
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Post by martyn on Feb 12, 2023 23:41:28 GMT -8
Yes indeed but they were not doing that before I made the changes, it matters not though as i dont think the changes are worthwhile.
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Post by Karl L on Feb 13, 2023 0:38:38 GMT -8
One experiment I've been thinking about is to inject secondary air sideways underneath the firebox roof.
This would be through horizontal slots at the top of the fire box side walls, aimed at the port.
The slots would be right at the top so the air hugs the firebox roof via the Coanda effect. |
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Post by Vortex on Feb 13, 2023 1:50:01 GMT -8
Karl, hof was thinking of doing that: donkey32.proboards.com/post/37020/thread I don't remember if he did it in the end though, you'd have to read through his thread. Never found any benefit of removing the corners in the afterburner either visually or by testo, didn't try the center divider, might be that and the increased size of the secondary air is causing it to start forming little vortices of flame inside the edges of the secondary air inlets. |
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Post by martyn on Feb 13, 2023 5:28:31 GMT -8
I would like to try a full taper like 2.5 x 5 at the rear and 3.5 x 7 at the front but for my next run I am going to try out tilting the whole unit slightly backwards so there would be a better viewing angle form a lower position.
For a cook stove I think 36” is as high as I would like to go and with a 5-6 clearance gap to help distribute the heat on the hot plate, I think the view of the vortex will be a bit low for comfortable viewing. If I tilt it back it would be great.
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Post by rubenn on Feb 15, 2023 0:46:00 GMT -8
Ahaa, yeah.. Thanks a lot to link them again. I saw those as well on first page and wondered if they were the latest.. But they don't see to work for me.. the link simply doesn't open in my browser. Don't know if that's only me.. |
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Post by Vortex on Feb 15, 2023 1:23:50 GMT -8
A few people have had the same issue. If you send me a private message on the forum with an email address I'll send them to you that way.
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Post by martyn on Feb 15, 2023 23:04:54 GMT -8
I made another video, the actual vortex was not displaying very well this time, it was really staying at the back and not forming very well but I could not get the stove to over fuel no matter what I tried……
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Post by Vortex on Feb 16, 2023 2:16:57 GMT -8
Looks like maybe too much air, did you try reducing the primary/secondary to see if that improved the vortex? I wondered if having the afterburner sloping upwards would cause the vortex to exit faster. I never tried that V in the roof so don't know how that would effect things, but the corner slopes never had any effect on the vortex for me other than losing those little reverse vortices in the corners.
If you want to upload some pictures of those drawings I can host them on my server.
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Post by martyn on Feb 16, 2023 5:11:23 GMT -8
Yes I think you are right, too much air. I will hold back on the pictures until I have done a few more test, I want to build a sloping afterburner and see how much of an angle works best or just how far we can go! I hope to get a fresh stove running in the not to distance future complete with adjustable air inlets. I have seen cast iron skillets for sale on Amazon, they measure 8x12” so I could use one for a removable ash tray that could be moved up or down inside the fire box and one could be used for the fire box roof. I think the four inch vortex is a different animal to a six inch version as the Temperatures are quite a bit lower, I think the vermiculite might be quite long lasting and the viewing glass can be installed closer. So i intend to build one in a manor that allows the vermiculite to expand and maybe have easy replaceable parts. It could take years of minor adjustments and then when ‘I’ am happy, it might show terrible results with proper testing equipment but as long as I am having fun, I will keep going. www.amazon.co.uk/dp/B07HJ25KZ8/?coliid=IFWV7YR2T7TB0&colid=GTWUORWRDD7G&psc=1&ref_=lv_ov_lig_dp_it |
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Post by Dan (Upstate NY, USA) on Feb 16, 2023 5:34:02 GMT -8
Yes please keep going!
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Post by Vortex on Feb 17, 2023 6:07:22 GMT -8
I think the four inch vortex is a different animal to a six inch version as the Temperatures are quite a bit lower, I think the vermiculite might be quite long lasting and the viewing glass can be installed closer. So i intend to build one in a manor that allows the vermiculite to expand and maybe have easy replaceable parts. It could take years of minor adjustments and then when ‘I’ am happy, it might show terrible results with proper testing equipment but as long as I am having fun, I will keep going. The only 2 pieces of vermiculite I've ever fixed in position are also the only ones that cracked that weren't fired wet. The glass seems to be OK up to about 800C, above that the surface gradually starts to degrade. Yeah, please keep going, it's great to have someone else experimenting on it. In all my hundreds of testo runs I never had one that was dirty where the vortex was formed properly, stayed in the afterburner and didn't soot the glass. Trev |
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Post by martyn on Feb 23, 2023 9:27:24 GMT -8
New video….
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jonasp
Junior Member
Posts: 102
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Post by jonasp on Feb 23, 2023 23:41:43 GMT -8
Love seeing all these experiments, interesting stuff even though I'll keep mine simple and no secondary air |
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