Okay, I've done some searching but couldn't find my answer (maybe I'm asking the wrong questions).
I'm considering doing a compressor conversion as was explained by an earlier poster (ZeroFossileFuel's Post
). Looks like a great idea and I have a dead compressor looking for a good project.
I understand that CSA needs to be maintained through the system from feed tube to exhaust for good burn. Should it be as consistent as possible or is it better if it increases just slightly as it progresses through the system (smaller at feed than at final exhaust)?
Also, does the CSA of the bell housing around the heat riser need to also be consistent or can it be larger? It makes sense to me that if it is larger it would slow the gases at that point and you'd just lose more heat to the primary heating and not get quite as much into the heat mass. If that's acceptable to me will it mess with flow at all for it to be larger than the rest of the system CSA?
I understand there is a relationship of the heat riser height to the burn tunnel length, but is that measuring the heat tunnel at the top (between feed and heat riser), at the bottom, or an average of the two?
Finally, is there any relationship to the CSA of the feed tube to the heat riser? I would think that a larger feed tube (hence more fuel at one time) might require a taller heat riser to ensure secondary fuel consumption.
Now I just have to figure out how to cut the tank and how to convince the wife I need a welder.
Thanks for any input or possibly search terms that might lead me to these answers if they've already been asked. If this information is out there, it might be a good subject for a sticky topic along with some basic calculations, critical dimensions, etc.
Brian in Oregon