|
Post by hinotama on Dec 9, 2011 12:34:27 GMT -8
I have never seen this idea, but here goes.
It seems that the riser needs to have laminar flow. We also want to the heat of the column in the riser to be as high as possible.
Has anyone thought about putting rebar right in the center of the riser? What would happen? I am thinking that it would keep that column heated even if the stove temporarily ran out of fuel or if there were some other problem, but it would also make the heating more uniform, wouldn't it?
Would it make for a cleaner burn by adding turbulence?
|
|
|
Post by canyon on Dec 10, 2011 1:23:04 GMT -8
Although rebar will burn away pretty rapidly, I have thought about this with stainless bar and asked Peterburg about it in another thread which his reply suggested that it wouldn't improve things but one of these days when I am tinkering I want to try it with the Testo sniffing things and see what the numbers say with a bar and without. Ernie mentioned improvement with a bar laid across the top of the riser in a thread quite some time ago. Keep us posted if you try something along these lines.
|
|
|
Post by hinotama on Dec 10, 2011 4:16:39 GMT -8
Interesting. Yes I will keep everyone posted. Ernie's result illustrates that heat at the very top of the riser is all you need to get that updraft. However, that hot bar will cool (or will it?) eventually, whereas having the whole bar in the middle of the riser gives more thermal inertia.
I did a little experimentation today with "fuel out" situations and without a metal riser. As one might expect, cooling was much more rapid without the metal to retain the heat.
|
|
|
Post by hinotama on Dec 12, 2011 4:35:20 GMT -8
I had a bad day with a riser that would not heat yesterday. I molded a riser out of clay and tried to fire it in situ. The clay was cold and wet.
But you know, if I had a superheated piece of rebar in the middle of the clay riser, it might have let me get the rocket started.
I might try this someday. Heat a rebar in one rocket stove. Mold a riser out of clay, then put the superheated rebar in the middle of the clay riser and fire it in situ.
|
|
|
Post by martinm on Jan 25, 2012 10:33:08 GMT -8
|
|