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Post by davisdesigns on Feb 7, 2016 23:54:06 GMT -8
I have a few inputs i'm not sure which would give me the most realistic outcomes on analyzing the flow pattern. Stove measurements; 6" SQ tube X 14"L inlet attach to spiral connection to 6" diameter 55 degree downdraft X 12"L that attaches to a 6" diameter riser X 44"L The input variables i have selected 1500F But i think i should lower it to 660F since the temp is through the interior. I have the option of Pressure, Volume or Mass and they all react/ flow differently through the stove and at this point the measurements dont matter, its the visual flow/ mixing that i'm after. I also have the option to enter data that corresponds to the units mentioned. What unit would give me the most accurate visual representation? and corresponding data ie CFM/ PSI differential on output of riser v's intake or approximate mass. The stove will be primarily used for pellets but optionally burn anything combustible. For references, this is the interior volume of the burn and riser.. Well forget about the pic's says site has reached its max. and also not loading the img. host i uploaded to... (Unable to upload file RSA1.51.jpg. Error: This forum has exceeded its attachment space limit. Your file cannot be uploaded) its 58.7kb Well BBCode works..
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Post by peterberg on Feb 9, 2016 3:24:48 GMT -8
Davis, Did it occur to you that such a spiral would consume a lot of energy i.e. impairing draft, apart from mixing excellent? The dead end at the bottom of the vertical stack will create drag as well.
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Post by satamax on Feb 9, 2016 6:16:41 GMT -8
And also fill up with fly ashes.
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Post by Donkey on Feb 9, 2016 14:02:41 GMT -8
Davisdesigns, It is HIGHLY recommended that before you try to improve on rocket stove designs, that you build a working "by the book" model first. Build it well in the proscribed way and get it up to temperature for an extended period. When you have accomplished this, you will be better informed on how to even begin to improve the technology.
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Post by davisdesigns on Feb 11, 2016 20:58:56 GMT -8
Davis, Did it occur to you that such a spiral would consume a lot of energy i.e. impairing draft, apart from mixing excellent? The dead end at the bottom of the vertical stack will create drag as well. Thanks for analyzing the burn chamber and riser that is at about 35%... Lets keep it on topic please, not asking for design input on this post, just approximate flow data.
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Post by davisdesigns on Feb 11, 2016 21:09:26 GMT -8
Davisdesigns, It is HIGHLY recommended that before you try to improve on rocket stove designs, that you build a working "by the book" model first. Build it well in the proscribed way and get it up to temperature for an extended period. When you have accomplished this, you will be better informed on how to even begin to improve the technology. So apparently no one has a clue what i'm asking in this post, does anyone use 'real' CAD or just the sketch up garbage... Ok back to the metal rocket stove fabricators forums as they seem to be more helpful and less opinionated...
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Post by satamax on Feb 11, 2016 23:52:59 GMT -8
And also fill up with fly ashes. I'll ask you again to please NOT! comment on my posts, Thought i made that clear before. I dont like your negative attitude. Since you are a mod. I would assume you are only using your position to push me away from this forum, good for you... P.S. Fly Ash accumulation is kinda the point of it... Ya cant to a flow analysis on an assembly so sorry i left things out for you to try and crap on. And the problem for you is, if i want to reply, i do. Why would i refrain? You are not the owner of this place. You don't like negative comment, and, what positive could we give you? Everybody tells you that metal won't last in the core, and you still don't want to listen. Ok, fair play, if that is not a negative atitude. You never showed us anything, so, we can't give a single positive comment. As Donkey said, go on, build something, show us what you're worth. And may be then, you will get more help. I'm not even saying a "by the book" rocket. Just show us what you are worth. Myself, despite my negative comments, i try to help a fair bit of people here and at permies. Even you. Who have you helped here? Elswhere? It never occured to you, that if nobody can help you here, you should turn to a more specialised forum, about flow analysis? May be there's two guys here who could reply. But could you immagine that they don't want to reply to you, because they don't want to be dissed, confronted, or can't be arsed to reply to someone who they don't know, and who will waste their time. Btw, i'm the one who has dug out your two pictures, you didn't manage to post correctly.
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Post by Dan (Upstate NY, USA) on Feb 12, 2016 1:25:45 GMT -8
Get some dust!
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Post by Daryl on Feb 12, 2016 3:53:55 GMT -8
I'm over on Potty's board.
1. You are going to jam up the base of the feeder tube. 2. Check out venturi and Bernoulli's Principle. 3. Gases rise. They are naturally going to want to flow to the top. 4. Most pellet burners online use gasifiers or another type of stove. I don't use pellets so I can't tell you why they burn that way but I have learned that fire burning hasn't changed over the centuries and if a large group of people are doing things one way, then there is a reason for it. 5. The rocket is a basic stove. I know there is a lot of marketing from another site to make the rockets seem like a completely new invention. The same fire principles will work on rockets as they do with other stoves. My advice is to study all types of stoves and get outside and make little stoves to experiment with to learn about combustion and gas flow.
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morticcio
Full Member
"The problem with internet quotes is that you can't always depend on their accuracy" - Aristotle
Posts: 371
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Post by morticcio on Feb 12, 2016 9:54:09 GMT -8
"CFM/ PSI differential on output of riser v's intake or approximate mass." I didn't reply because what you were asking went way over my head! I follow Peter's policy of keeping it simple, I'd suggest you do the same
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Post by warmitupchris on Feb 26, 2016 4:10:48 GMT -8
Davisdesigns, It is HIGHLY recommended that before you try to improve on rocket stove designs, that you build a working "by the book" model first. Build it well in the proscribed way and get it up to temperature for an extended period. When you have accomplished this, you will be better informed on how to even begin to improve the technology. So apparently no one has a clue what i'm asking in this post, does anyone use 'real' CAD or just the sketch up garbage... Ok back to the metal rocket stove fabricators forums as they seem to be more helpful and less opinionated... Davisdesigns, In all sincerity, this is probably the best thing for you to read to really help you at this point:
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tomr
New Member
Posts: 2
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Post by tomr on Feb 27, 2016 22:04:18 GMT -8
In a real rocket, the way you guide your rocket is swivel the engine If you try to steer it like a boat with a rudder , the rudder or vanes absorb energy, that's why they don't do it that way.
Your stove should manipulate the gasses, not force them to do unnatural actions.
You should make a normal stove. Then put your spiral in and look at the difference in data. Good or bad.
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