Re: Fire in exhaust

Posted by buickanddeere on May 19, 2005 at 10:38:34 from (192.75.48.150):

In Reply to: Fire in exhaust posted by Smart Deere on May 18, 2005 at 18:41:01:

Unless the exhaust mixture is carrying enough raw fuel to get above the LEL when mixed with atmospheric oxygen then burning isn’t happening above the stack. That red or yellow that looks like flames, isn't flames.
The burning was done in the combustion chambers before the exhaust valve ever opened..
Materials be it gas, liquid or metal will glow incandescent when temps start getting about 1200F. Pure clean air at even 1750 will barley visibly glow. There has to be some particles of carbon etc from unburned fuel or oil suspended/ carried in the exhaust gases. The little particles are what you see glowing red or yellow.
Set the oxygen acetelyn torch rich and there is lots of bright flame from the red hot floating soot. Now give that same amount of fuel slightly more oxygen than what it needs to burn clean. And even though the flame is much hotter. The “flame” is "smaller" and very dim.
That's also why a gas or kerosene lantern without a mantle makes very little light. The almost invisible flame heats the mantle white hot and make it glow.
By the way Coleman lantern mantles are too radioactive to be allowed to leave a nuclear station.

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