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Post by boscovius on Feb 10, 2019 15:32:09 GMT -8
Brian, I really like what you've done here. I have also been thinking along the lines of a DSR with window to the double rams horn. Though my original concept has the addition of a third, shallow box, with a second port in the ceiling of the second box, close to the glass, with the exhaust then venting out the back, or either side, depending on the arrangement. I want my core considerably up off the floor, but still able to downflow into a cookstove, with oven, finally into a bell bench where the flue is attached.
Not sure how the shallow third box plays out. Following your progress.
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Post by Vortex on Feb 11, 2019 1:30:05 GMT -8
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Post by coastalrocketeer on Feb 11, 2019 10:35:43 GMT -8
Hi Brian... none of your pics from the early posts are showing up for me... just empty white squares... is anyone else having this problem?
Videos on Vimeo are all there... just would love to see the overall shape... and I think that may be why someone asked for a wider view recently.
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Post by Vortex on Feb 11, 2019 13:13:24 GMT -8
I get the same thing unless I'm logged into a google or gmail account, even though Brian has the pictures set to public.
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Post by coastalrocketeer on Feb 11, 2019 15:38:31 GMT -8
TY Vortex, I’ll try that...
Hmmmm... tried it. Still no go. Maybe it’s an issue with the browser on my phone. Will have to try from computer.
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Post by Vortex on Feb 12, 2019 1:47:45 GMT -8
Just tried it again from different browsers, all the same: "error 404 not found". Even when logged into a gmail account didn't work. As soon as I logged into a Google account they all worked - Welcome to 1984.
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Post by DCish on Feb 14, 2019 18:47:45 GMT -8
Sorry guys. It is my intent to switch my prior stuff from google to imgur / vimeo, but that'll take some time. And I'm filling my vimeo quota pretty quickly, so I'll have to be careful, maybe find some other places to host too.
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Post by DCish on Feb 16, 2019 20:03:40 GMT -8
Hadn't planned on doing this, but last Sunday I tried another afterburner shape after a number of discussions on other threads. I started wondering what would happen if I made the afterburner box bigger by about 2.5 inches in each direction. Would the whole thing stay hot and fill with flame spinning concentrically toward the center?
It did burn, but mostly as a fire fountain. Even when I pushed it hard, only a small part of the top and sides ever picked up even a hint of red glow. And I had trouble getting it to burn clean. My hypothesis: there was too much space there to spread the heat around and the combustion gases were more likely to cool before combustion was complete.
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Post by coastalrocketeer on Feb 16, 2019 20:08:51 GMT -8
Seems like ceramic fiber blanket held in by it’s own stiffness, ala pinhead 5 minute riser covering ceiling and sides would be an easy way to try smaller and smaller boxes reducing the chamber by two layers width and one layer in height, if you have any suitably sized pieces laying around.
(Edit: actually, looking at the exit location, I expect building up the bottom and sides would be better)
And I agree with your hypothesis about a smaller space concentrating the heat and a larger one less so... seems like a restriction in the top box may increase this effect per peter’s latest experiments, though the utility of that probably depends on size of the box in relation to the batch box, and location of entry and exit in relation to one another.
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Post by coastalrocketeer on Feb 16, 2019 20:17:23 GMT -8
Seems like having the exit down lower in the box might help keep the heat in that zone too... something for me to try
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Post by Vortex on Feb 17, 2019 2:20:10 GMT -8
Hadn't planned on doing this, but last Sunday I tried another afterburner shape after a number of discussions on other threads. I started wondering what would happen if I made the afterburner box bigger by about 2.5 inches in each direction. Would the whole thing stay hot and fill with flame spinning concentrically toward the center? It did burn, but mostly as a fire fountain. Even when I pushed it hard, only a small part of the top and sides ever picked up even a hint of red glow. And I had trouble getting it to burn clean. My hypothesis: there was too much space there to spread the heat around and the combustion gases were more likely to cool before combustion was complete. I had the same experience with all the larger afterburner chambers I tried. Why is your video only 2 seconds long, it's hard to get the feel of it when it's so short? you get 500MB a week and a total 5GB on the free Vimeo accounts. If you fill that you can just make another account in a different name. |
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Post by DCish on Feb 17, 2019 4:49:23 GMT -8
Hah! Hadn't thought of multiple accounts...
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Post by Vortex on Feb 17, 2019 5:54:30 GMT -8
I've had my Vimeo account for a few years, have uploaded 25 videos, most several minutes long and I've still only used up 10% of the 5GB allowance.
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Post by DCish on Feb 17, 2019 12:31:11 GMT -8
I've had my Vimeo account for a few years, have uploaded 25 videos, most several minutes long and I've still only used up 10% of the 5GB allowance. I've filled 3/4 of a gig already with just a few short videos. I guess I should check the resolution I'm recording at, I could probably dial it back a good bit and still have decent video quality. |
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Post by DCish on Feb 17, 2019 12:38:00 GMT -8
Ok, so here are a couple more videos from that same burn.
Here's a slightly longer one. Most of the burn was more or less at this level.
And here's one with 5 or so 1x1 to 2x2 inch pieces dumped in at the peak of the burn to deliberately push it hard. It picked up some vortex action briefly before dying back again. Clearly if I put some splits on the bottom the vortex would be more symmetrical, but I had to push it so hard to try to get it to this point that it hardly seems practical pushing further with this enlarged layout when the 9 x 4.5 size works so well (thanks, Vortex, for those dimensions).
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