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Post by luddite on Mar 25, 2016 11:53:58 GMT -8
I am drawing away. I'll build it and share whatever I can but I cant help but thinking about the shape of burn tunnel opening. I have always had a problem with ember build up during continuous burning of the j-tube so like you, wonder about a more optimal layout. Perhaps the direct horizontal draft of his primary is solving this problem by burning embers away faster but if not i would think the problem could be worse. If a square or round burn tunnels work and the batchbox rectangle with its restrictions work (perhaps better?) then I wonder if a more optimal shape could lessen the possible effect of accumulating coals. All the layouts I am familiar with have a level floor from firebox to heat riser so i hesitate to raise the burn tunnel but I wonder about more of a port or a profile which transitions to a port. Would really like to hear any thoughts on the matter here is the thread I started if that's a better place. donkey32.proboards.com/post/20976/thread |
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Post by luddite on Mar 27, 2016 17:25:30 GMT -8
I can't see a port and riser instead of a round burn tunnel and riser is going to make a lot of difference to it. Only down side I can see is it's no good for fire gazing. This is what I have been pondering. I am retrofitting so can't really modify design to have a port without a tunnel but have been contemplating the effects of changing the tunnel profile. I'm certain that I'm not a rocket scientist, I can only speculate on what is happening inside a working rocket and that the math and physics are beyond me but if you have a few minutes to indulge me.... What would happen if I shaped burn tunnel with profile A vs profile B in following link? www.dropbox.com/s/8tiuvfzg21fn54t/IMG_20160327_203646.jpg?dl=0 Which would work better and why? How about transitioning from A to B or vice versa like this www.dropbox.com/s/onwpknyic65cxsd/IMG_20160327_201327.jpg?dl=0Idea is that the shape transition is creating high and low pressures, pushing/pulling hottest down (A to B) or coldest up (B to A). A to B or B to A? And why again? Pointless waste of time or worth the effort. Any relevant discussions? Thanks For the point of discussion we could just as easily discard my shapes and measurements and imagine triangles pointing up and down inside a simple j-tube rocket. |
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Post by Vortex on Mar 28, 2016 2:05:02 GMT -8
Probably best if you can make it so you can experiment with different port profiles that fit into the burn tunnel, then try them and see what works and what doesn't. You could cut them out of vermiculite board, as it only needs to last long enough for the tests. While you're at it try an X shaped port for me.
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Post by satamax on Aug 20, 2016 15:48:07 GMT -8
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Post by peterberg on Aug 20, 2016 23:44:10 GMT -8
Hmmm... I fail to see any benefits in this configuration. But if you must, pretend the thing is the same as a front loader as far as air inlets are concerned. You won't be able to open the lid while the thing is running of course, whatever inlet you choose.
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Post by satamax on Aug 21, 2016 2:59:39 GMT -8
Peter, the only advantage i see, is for cooking and practicality. I am not that old, but i've abused my body a bit. Top loading can help in not bending that far down, if i want to keep the heat riser below a cook top for example. Or an oven. I can make the firebox go further downwards towards the ground. And still not having to bend to the floor to load it. I can make the normal batch top loading too. But this idea needs to be tested before  Another thought about this configuration, is the wood itself. Gravity helps to feed in this case, you might not have to use gloves when reloading. The two problems i see with it. The risk for the embers to block the port. Hence the "flame developer" the little bit of burn tunnel before the port. And the other one, you have seen, when you reach the point where the whole top of the batch of wood catches fire, with the rest being well into burning already. And that overloads my stoves. Well, the range retrofit, i'm not sure. As i have a smaller firebox. I know i'm using larch, and not that many hardwoods. But that's what i have. And i'm woried on the vertical, that might overload even more. By the way, i'm not even sure i couldn't open the stove during the burn. As, on the workshop one, the cast iron top of the firebox, fell onto the wood once, with no real adverse effect. |
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Post by walterceccotti on Oct 23, 2016 7:57:21 GMT -8
Hi,
I just attached a metal pipe for the vertical batch box. It works fine and Leaves the combustion chamber clean. Is it possible to upload photos directly on the forum? I dont want to upload to external server first. Just look it on my fb account...
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Post by satamax on Oct 23, 2016 9:03:10 GMT -8
Walter, try hostingpics, that is the nicest i've tried for pics. Otherwise, on the forum, we've attained our limit long tome ago.
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Post by walterceccotti on Oct 24, 2016 2:45:29 GMT -8
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Post by walterceccotti on Oct 24, 2016 2:49:04 GMT -8
I created a mechanism with an iron wire that pulls up the burner until it taps the batch-tube from the bottom. With a fan i push out the eventual residual smoke from the upper tap of the batch-tube. Only after this, i open the upper tap and recharge with wood. After this i close the tap and pull down the bottom tap until it becomes the burner surface again and it reignites using residual carbons.
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Post by satamax on Oct 24, 2016 3:15:56 GMT -8
Walter, can you draw a diagram? I should admit i dont understand what this is.
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Post by walterceccotti on Oct 24, 2016 3:25:55 GMT -8
Walter, can you draw a diagram? I should admit i dont understand what this is. In pic n 2 u can see the small metal iron wire that comes up from the T tube. It connects to the iron chain(for durability)in the last pic. If u pull the wire, the burner will come up, isolating the batch-tube from the combustion chamber, so you can open it without smoke coming in and recharge with long split pieces of wood. The tubes i used were spare parts from the building stove process. I am not very good at drawing, but i ll try |
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Post by walterceccotti on Oct 24, 2016 3:43:05 GMT -8
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Post by walterceccotti on Oct 24, 2016 3:47:28 GMT -8
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Post by walterceccotti on Oct 24, 2016 3:48:05 GMT -8
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