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| My... Oneday furnace burner.. |
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| NeoTech:
Think im gonna get me a set of microdrills and go up 0.1mm in the mig tip until it stabilises then.. As of know 50% throttle produces a great flame though but its a bit tinkerish to get it stable. poking that choke back and forth. hehe vtsteam, im sorry to say that heat is from my plasma cutter when i poked the venting hole in the lid after i had cast it ;D |
| vtsteam:
The choke adjusts mixture. A flare provides flame stability. The furnace itself can also do that. The flare slows the gas air mix until it's speed matches the flame speed. At that point it burns. The flare is a taper, so somewhere along its length, as the gas air mix expands to fill it it slows enough to burn. The position of this flame front will depend on how fast the gas air mix is being injected, which depends on the pressure and orifice size. So you can vary the flame position by orifice size, or by pressure adjustment, or by adding a flare. If the position of the flame front is too far away from the end of the burner, it is blown out. The flare allows a nice smooth range of positions for different gas pressures. In other words, somewhere in the flare, the flame front should be stable for a good range of pressures -- throttle settings. |
| NeoTech:
so what you say is the burner could stabilise when put into the furnce with some luck, and well it couldnt and then i need machine some more parts.. Hmm i think this will need further investigation.. *and me go buy more propane* ;D |
| vtsteam:
Neo, yes, a lot of people find a flare is not needed once a burner is installed in a furnace. The hot walls maintain the flame. |
| NeoTech:
So experimenting.. The torch tends to "stabilize" when the burner tube starts to switch over to redish color in the tip.. The gas end of the tube is still cool to the touch.. A flare didnt do much for it at all actually but im now thinking a diffusor of some sort.. like a fine mesh or similar could help.. Or am i wrong? |
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