time
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Posts: 32
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Post by time on Apr 2, 2015 19:00:58 GMT -8
Thank your all for your help and recommendation so far. My large rocket is coming along slowly. But while i am waiting for some plate to arrive I would like to try a small rocket, with the view to traveling with it. currently i travel with a frontier stove, which is quite an elegant, yet inefficient stove. www.belltent.co.uk/truly_portable_wood_burning_stoveI've read with interest the development of several 3in rockets, but none seem to have batch boxes. I also saw a great design from mathewwalker where he placed a square metal bell over a batch box. Developing that idea into a smaller version i have come up with the attached. I under stand that laminar flow becomes a problem below certain sizes, but i've not had a problem with draw on the 60mm frontier stove. I would appreciate your opinions on this "micro travelling rocket" particularly if you do not think it will work. Time. Attachments:
60mm micro rocket.skp (170.47 KB)
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Post by satamax on Apr 2, 2015 21:53:40 GMT -8
The only answer is, build it, i want to see.
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time
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Post by time on Apr 2, 2015 22:52:31 GMT -8
Ok, I will. As we are talking about laminar flow limitations, have you ever looked at incorporating heat exchanger corrugation channels into the riser to speed up the flow in the riser? www.youtube.com/watch?v=WG-YCpAGgQQTime.
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Post by Daryl on Apr 3, 2015 2:00:45 GMT -8
Wow, Max is behind a metal stove. *wink*
On youtube, metal builders have been using mainly the batchbox design for years. A batchbox is basically a burn box with a venturi at the end.
Since a bell is used to store heat, I don't know how well the metal box on top of your stove will work. Try it.
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Post by peterberg on Apr 3, 2015 3:23:32 GMT -8
Ok, I will. As we are talking about laminar flow limitations, have you ever looked at incorporating heat exchanger corrugation channels into the riser to speed up the flow in the riser? That's a video of a firm who's selling heat exchangers. Ever heard of clever advertising? I find it hard to believe this animation would do the same in the real world.
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Post by DCish on Apr 3, 2015 13:43:55 GMT -8
I'd actually say that a bell isn't used to store heat so much as to increase the dwell time of the hottest gasses so they transfer heat before being exhausted. A metal bell would work just fine.
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time
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Post by time on Apr 3, 2015 13:52:14 GMT -8
Wow, Max is behind a metal stove. *wink* On youtube, metal builders have been using mainly the batchbox design for years. A batchbox is basically a burn box with a venturi at the end. Since a bell is used to store heat, I don't know how well the metal box on top of your stove will work. Try it. I''m not wanting it to store heat, just to be a source of radiant heat.
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time
New Member
Posts: 32
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Post by time on Apr 4, 2015 13:53:36 GMT -8
Ok, I will. As we are talking about laminar flow limitations, have you ever looked at incorporating heat exchanger corrugation channels into the riser to speed up the flow in the riser? That's a video of a firm who's selling heat exchangers. Ever heard of clever advertising? I find it hard to believe this animation would do the same in the real world. Thats not an animation. it's a video of real fluid flowing through a real glass pipe.
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time
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Post by time on Apr 4, 2015 22:30:07 GMT -8
I've made the batch box and riser, it seems to roar along quite well. before i finish up the box and bell. i'd like an opinion on ceramic wrapping the riser. would 25mm ceramic blanket wrap be ok or would i be better using 50mm?
Time
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Post by shilo on Apr 5, 2015 0:33:31 GMT -8
better to use 25mm twice.
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Post by peterberg on Apr 5, 2015 1:30:13 GMT -8
Thats not an animation. it's a video of real fluid flowing through a real glass pipe. It could be working as shown. Still, I have my doubts, there's no evidence of the same feed and temperature at the lower end of the pipe.
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