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Post by Dan (Upstate NY, USA) on Mar 25, 2021 18:16:29 GMT -8
When you started out you had a board of something that got so hot it cracked.
Is your 2" of fiber board robbing heat and transmitting it to your concrete floor?
Before you had a huge air gap, now you don't, just thinking...
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fuegos
Full Member
not out of the woods yet
Posts: 177
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Post by fuegos on Mar 26, 2021 2:42:19 GMT -8
"at least there is no physical mechanism that explains his assertion" I didn't make any assertions , i simply asked a series of questions , proposing a theory as indicated by ? & words like maybe , might and i think. "outside test firing yielded 2500 degrees. Inside, the best I've been able to do is 1400 and most of the time it stays around 900-1100" the difference being the bench so it's reasonable to theorise that this is causing the temp. drop.
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Post by Vortex on Mar 26, 2021 5:25:40 GMT -8
An open ended core has no resistance to gas flow, so easily goes into thermal runaway driving itself faster and faster and hotter and hotter. Once connected to a mass/bench/barrel etc. there is a resistance to gas flow which creates a speed limit, so temps are bound to be lower.
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Post by peterberg on Mar 26, 2021 8:50:28 GMT -8
Excellent wording, I'll second that.
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Post by Solomon on Mar 26, 2021 10:46:01 GMT -8
An open ended core has no resistance to gas flow, so easily goes into thermal runaway driving itself faster and faster and hotter and hotter. Once connected to a mass/bench/barrel etc. there is a resistance to gas flow which creates a speed limit, so temps are bound to be lower. This is a very good concept, and what I was thinking. Reduced gas flow, reduced oxygen, reduced temperature. Nothing being "stripped" out of the core. Question is, what is the proper temperature? Seems like when it gets the hottest, that's when it actually smokes (still just a little). I've gotten it up to 1700F lately, which I feel is getting into a good range. Autoignition temperature of CO is 1128F, so anything in that range is great. Now the core is encased in cob, so that will make a difference also. I have noticed a lot of my ash is blowing into the manifold and the bench. So still throttle still may be a bit open. Need to get some oxygen sensing. Draft is amazing, I can actually pile wood into the feed tube and light kindling on top of it and it will suck the fire down. Just did it for a test, it's a bad plan because it smokes that way.
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