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Post by pinhead on Feb 1, 2017 7:20:38 GMT -8
Keep it simple. If you want to instantly create the double-vortex, make the heat riser heart-shaped. I did it accidentally by using a 6-inch steel duct inside the heat riser on the first PBB I built. When the flame got into the riser the steel expanded and forced the seam inward, which happened to be opposite of the port. This shape shouldn't be difficult with casting. I don't know how much better it'll be than the normal round riser, though. www.youtube.com/watch?v=4vJWkDr9DVs |
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Post by matthewwalker on Feb 1, 2017 7:23:56 GMT -8
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Post by pyrolyse on Feb 4, 2017 14:33:57 GMT -8
Walkers core doesn't use insulation, does it? Are you just trying something out? Wrong. The entire core is made out of insulated fire bricks, and it doesn't work without it being highly insulated, according to Matt. |
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Post by pyrophile on Jun 26, 2017 13:35:10 GMT -8
Brian, using your horizontal slot, where is your secondary air inlet?
Benoit
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Post by DCish on Jul 1, 2017 1:57:26 GMT -8
So far it has just been by making a crack in the brickwork above the slot so that fresh air can come in. Crude, I know, but that's what I've been able to do so far. I have a couple of ideas for channels that I plan to try this fall/winter when I am able to get back to it.
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Post by pyrophile on Jul 1, 2017 10:13:11 GMT -8
Thank you! Can one see it on the images you posted? It is interesting that one doesn't see on the images the effect of this secondary air inlet situated above!
Benoit
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Post by DCish on Jul 4, 2017 18:30:54 GMT -8
I don't think it's really visible, and I've torn down that prototype, so I can't take any more images. I just pulled the bricks apart a bit until it burned well for the sake of rough testing to see if the vortex would form. No Testo data or anything fancy like that available here other than the good old sniff test, which it passed just fine.
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Post by pyrophile on Jul 6, 2017 9:13:11 GMT -8
Thanks!
Benoit
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Post by DCish on Jan 1, 2019 10:07:55 GMT -8
Life tends to give me time to experiment in fits and spurts. After reviewing what's been going on since I've been distracted by other things, I'm opening a new thread to track continued development of what I hope will be the core that ultimately replaces the box stove I am currently using. Here's a link to the new thread. |
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stoker
Junior Member
Posts: 61
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Post by stoker on Jun 21, 2020 16:11:16 GMT -8
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Post by DCish on Jan 21, 2021 13:18:40 GMT -8
Sorry about that. When G+ went under it took my pics with it. I have copies of most of them and was able to reclaim a lot of them (all the pics on this thread are reclaimed / re-posted). Life got busy and I've been unable to spend time on this hobby recently, unfortunately. Hopefully I'll get back to it at some point. |
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Post by Solomon on Feb 6, 2021 6:57:38 GMT -8
Keep it simple. If you want to instantly create the double-vortex, make the heat riser heart-shaped. I did it accidentally by using a 6-inch steel duct inside the heat riser on the first PBB I built. When the flame got into the riser the steel expanded and forced the seam inward, which happened to be opposite of the port. This shape shouldn't be difficult with casting. I don't know how much better it'll be than the normal round riser, though. www.youtube.com/watch?v=4vJWkDr9DVsThat's the kind of innovation that can remove variables. One day someone with the means will work all this out in fluid dynamics simulators or something and come up with the near perfect core concept. Reminds me of the Dragon Heater, just in terms of shaping the core to cause things to happen a certain way. |
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Post by Jura on Feb 6, 2021 8:25:20 GMT -8
One day someone with the means will work all this out in fluid dynamics simulators or something and come up with the near perfect core concept. I tried to Mesh the Vortex core in Fluent and OpenFoam but.. I'm too short for that :-(. I had only time limited access to the Fluent software and.. I saw no deeper sense in spending months on learning how to conduct proper simulation. Soon the new version of the soft will allow for much easier mesh changing which will make programming of non steady state environment much faster. |
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