Glenn Herbert wrote:If you must build your stove out of steel, I would suggest making the feed vertical instead of angled. That way the wood will be guaranteed to drop all the way to the bottom, and the fire will encounter two right angles on its path, making it more turbulent and aiding fuel/air mixing. The angled design has the fire at the bottom of the riser, so it encounters only one turbulence-generating angle.
I note that you have your riser significantly longer than your feed tube, which is good as it will allow the riser to firmly establish the correct draft instead of wanting to burn back up the feed.
The angled design meets directly at the chimney, so the angle feed and chimney are really two chimneys. In seeing the video of two candles in a box with two chimneys above, one candle is calm, and the other flame is turbulent, so the angle design shares a chimney, so it would have to be a mix of turbulent and calmness. If the fire would somehow "shrink" or be microscopic (still a normal rocket, but the particles at small scales dominate), then having a level entrance, and angled entrance, and a vertical chimney, the angled entrance would travel faster because a grid of squares, the diagonal direction on graph paper of a square is longer than either edge of the square, so diagonal directions travel faster since they have to travel a further "distance", but it would only work if something were added like a catalyst that would cause tiny sized particle movement.
The point would be that the chimney being longer would normally have air flowing up it, but you could tune it so there's complete stillness of movement up the chimney because the diagonal feed would travel faster, air inside would be still. But the one thing I remember about that candle video is that there was no entrance but two chimneys, so initially air is being used up by the two candles, and then air flows down one chimney, and the other chimney air flows up (even if both chimneys are the same length because of variations). Once again I say that a triangular chimney is involved, because I remember the time I had a triangular chimney, it was difficult for air to go up the chimney, but it still burned.
Edit: I would say that a triangular chimney would work smoothly if it has a diagonal feed going directly diagonal into the chimney, because the diagonal feed would make it easier for air to go up the chimney now. I think you would also need a level entrance as well, because the triangular main chimney acts like the restriction.