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Post by wiscojames on Jan 4, 2019 19:06:46 GMT -8
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Post by gadget on Jan 4, 2019 20:41:07 GMT -8
looks like some pretty good mixing on your burn. Have you ran it very long? I'm curious how much insulation 1" provides. I'm still trying to decide if 1" is enough for really keeping the heat in.
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Post by ronyon on Jan 5, 2019 0:20:16 GMT -8
Gotta love the simplicity of your design, stacked tunnels with a port inbetween!
The DSR2.X puts the port at the rear of the firebox, your design is closer to DSR1 I presume.
Splits on the bottom of the firebox for abrasion resistance, do they run up the the sides?
I have an idea for creating abrasion resistance, that might work. Spritz the fiber blanket with water and sprinkle refractory cement on the surface. Let it set, then repeat until the cement is thick enough.
I've done this to create a hot face for rockwool in an (as yet untested) rocket grill. I've been thinking about it as abrasion protection for ceramic fiber.
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Post by Vortex on Jan 5, 2019 2:37:23 GMT -8
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Post by wiscojames on Jan 5, 2019 6:36:38 GMT -8
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Post by wiscojames on Jan 5, 2019 6:38:02 GMT -8
I have not run it long, maybe this weekend. I feel like one inches provides a lot of insulation, especially if it's not abraded or compressed.
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Post by Vortex on Jan 5, 2019 7:22:16 GMT -8
There's a minimum depth for the port, so it acts like a gun barrel and directs the flow, if it's too thin or if the port does not have sharp 90 degree edges it will not behave as it should. Maybe if you have some small off-cuts of firebrick you could place them around the inside edges of the port.
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Post by wiscojames on Jan 5, 2019 8:49:39 GMT -8
Ill put some firebricks in there next time I open it up. It's 2 inches deep, but I guess i didn't cut them completely perpendicular.
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Post by gadget on Jan 5, 2019 10:27:06 GMT -8
I'm going to use Fiber board in my next build (like Matt uses) in the entire burn chamber, no brick. Blanket everywhere else wood will not touch. Plan is to add a face coat 1/8" thickish to the board to help solve the abrasion problem. I don't like how long fire brick takes to warm up. I have used face coats before on forges and they can be pretty strong while not needing to much heat due to the thinness. The face coat can be patched as needed.
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Post by DCish on Jan 5, 2019 13:15:00 GMT -8
Cool build! I am also interested in seeing how your face coat experiments develop.
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Post by pinhead on Jan 8, 2019 6:10:15 GMT -8
Unfortunately I never got around to actually building the thing. I believe peterberg tried it when designing his DSR and from what I remember, the round tunnel didn't work up to his standards.
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Post by peterberg on Jan 8, 2019 12:00:34 GMT -8
I believe peterberg tried it when designing his DSR and from what I remember, the round tunnel didn't work up to his standards. Hmmm... not entirely true. During DSR development I didn't test a round top box because it's a bit more complicate to build. I am always looking around for simple ways to build a core, but in this case a 5-minutes riser might do the trick.
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Post by wiscojames on Jan 9, 2019 18:33:32 GMT -8
For me, this presents an easy, quick, cheap way to build a core. Also, there's the viewing window.
Longevity of the firebox is an issue without a liner, and the ceramic fiber material seems questionable from an ecological standpoint, but it seems to be a promising avenue to explore.
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Post by wiscojames on Jan 11, 2019 19:35:53 GMT -8
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Post by coisinger on Jan 28, 2019 9:45:47 GMT -8
Hmmm, seems to me that with a cylindrical shape, you could offset the main port so as to line the flow up along the edge. You'd create one heck of a vortex in the secondary chamber.
A more tricky build perhaps, but could be worth experimenting with.
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