I'll give you a little background where I'm coming from. I like to build things, and metal is my preferred material. I started off building a small anvil, then decided to put a harder surface on it and purchased a 1/2" thick piece of D2. I knew D2 was tool steel but that was about it. I then discovered all about heat treating and figured I'd build a little HT oven. I built it out of standard firebrick and mortar. Then I learned all about refractory materials (do you start to see a pattern here?). So I have this brick and mortar boat anchor, and get the bright idea to turn it into a forge. Drill and cut a few holes in it and Bob's your uncle. I took apart an old propane burner I had for a still I made and used the nozzle in a few NA burners I fabricated. The regulator was junk, so while waiting for a new one I started messing around with blown burners, since I happened to have a blower. I went from 3/4" to 1" pipe, then to 2". This is fun! I made round flames, wide area flames (with a ribbon burner) and recently made long thin flames.
I've studied a bit about fluid dynamics, am quite familiar with Bernoulli, Coanda and have read a lot of Victor Schauberger (among others). I don't, by any means, claim to know much about forges or burners, but I'm getting the hang of it. I'll post a few pictures tonight of what I've made so far and let you guys have at it.
Ted