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Post by gavinguy on Mar 23, 2013 1:40:44 GMT -8
I could make you guys a video. My barrel has a 4" hole right over the riser already since I use it for cooking. I have plenty of ceramic glass around. I can lay a piece on there and shoot some video no problem. Where do you get ceramic glass? I've been looking for a source of free used ceramic glass for a while now, no luck. |
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Post by matthewwalker on Mar 23, 2013 9:06:41 GMT -8
I found a seller on eBay who had some old stock of replacement stove windows. Not free, but not too expensive either.
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Post by smarty on Mar 23, 2013 10:05:12 GMT -8
I was watching down the heat riser today observing this phenomenon. I had a face shield visor on and could smell burning rubber but I couldn't drag myself away! The flames were leaping about a foot out the top of the riser due to excess air creeping in round the 6mm plate steel door that had distorted in the intense heat. The air smelt of heat like when I am melting bronze. The rams horn pattern is like two 3D opposing corkscrew shapes as someone else pointed out. You don't get this so good from the photos. Then all up the sides of the heat riser there were kind of rippling waves like a series of fire rings swooping up. I took some pics but the rams horn pattern is whited out by the intense heat. Only at the gentler burns do I manage to get the pattern to come out on the camera. Here are some pics. By the way are the flames supposed to leap up in the air like that? I was thinking that I maybe need to extend the chimney. Attachments:
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Post by smarty on Mar 23, 2013 10:06:32 GMT -8
here are the flames leaping out! Attachments:
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Post by smarty on Mar 23, 2013 10:08:35 GMT -8
here is the whited out view down the heat riser Attachments:
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Post by Donkey on Mar 23, 2013 10:16:06 GMT -8
Smarty..
Yep, seeing the fire leap out like that is pretty typical. Once a barrel is on and/or the system is attached to a heat harvesting arrangement of some type, it will settle down into a more reasonable behavior..
Pretty cool, huh?
By the way, your images are ridiculously large.
They don't need to be any larger than screen sized, as they are for display. Could you PLEASE make them smaller?? The average monitor is 1024 pixels wide, your images are 3 times that and they dont need to be any bigger than, say, 800 pix wide to be seen.
Thanks.
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Post by smarty on Mar 23, 2013 10:24:01 GMT -8
Sorry Donkey I did reduce them to the lowest resolution I thought. I'll link to them on box.com in the future as I did in previous posts.
Cheers,
Martin.
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Post by pinhead on Mar 25, 2013 7:11:16 GMT -8
By the way are the flames supposed to leap up in the air like that? I was thinking that I maybe need to extend the chimney. As Donkey mentioned, this is quite normal. I believe we've come to a consensus that the phenomenon should be termed "flashover." |
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Post by smarty on Mar 25, 2013 12:59:42 GMT -8
wouldn't flamethrower be more apt! So that's what flashover is.
What is the current theory about what is going on here? Is it a good sign, or something to be concerned about? It certainly looks a bit worrying! Are more gasses getting burnt off at this point or the same? All I know is it made me jump around like an overexcited schoolchild!
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Post by Donkey on Mar 26, 2013 7:24:38 GMT -8
It's probably a combination of things.. In-impeded draft (no barrel, no piping, etc) full mouth, up to full temperature... I'd say that it's doing what it's meant to do, eat it's fuel at maximum temperature, as quickly as it can.
This is a good sign, so far so good. Now, you gotta get through the rest of the process (build the mass, flow-path, etc) while managing to maintain (hopefully over) half of it's current aggressiveness.
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Post by pinhead on Mar 27, 2013 11:52:33 GMT -8
I came to call it flashover due to the similarities with a flashover in a house fire; flashover is a firefighter's term. Wikipedia - Flashover. I think the rocket stove produces a "hot rich flashover." |
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Post by Vortex on Mar 28, 2013 3:18:03 GMT -8
I've always called that stage 'Going Critical', nice to know the correct term.
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Post by Donkey on Mar 28, 2013 6:25:18 GMT -8
Heh.. There isn't a "correct term" as of yet.. That's the beauty of being out on the bleeding edge of something... You get to make shit up as you go.. P-channel, Heat Riser, Flashover, watchamacallit...  Flashover, huh... Maybe, technically it's a little off, but I kinda like it anyway. What the heck.. Flashover it is. |
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Post by matthewwalker on Apr 12, 2013 8:52:56 GMT -8
I finally got around to filming this little clip yesterday. I will do this again with a longer lens so I can get farther away, in this one you can see me look like I'm waving, but actually the hair was burning off my hands!
The heater has only been burning for about 10 minutes at this point, so it's not fully warmed up. I threw in a handful of small, dry wood and started filming. You can see it start to ramp up, then I took a one minute break and shot the last 15 seconds or so, at which point I could not longer keep my hands there. It appears that you can see the oxygen rich layer bright orange over the lower layer, as the p channel feeds the oxygen in up high in the slot. Maybe not, but that's what it looks like to me.
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