In article <01GRGZ2Q65XE95OH2T@VAXC.STEVENS-TECH.EDU> Prime Mover Software Development <U93_PTUPACZE@VAXC.STEVENS-TECH.EDU> writes:
>The primary reason most Alcos smoke is due to the design of their
>turbochargers. They work correctly, for the most part; however, a design flaw
>in them allows the thick exhaust smoke to sneak past the turbocharger blades
>into the stack and out of the engine. This phenomenon only occurs when the
>engine is "notched out," or sped up. The engine immediately starts spitting
>out more exhaust smoke, but the turbocharger is still spinning relatively
>slowly. The turbocharger takes a few seconds to catch up to the correct speed,
>and in the interim, smoke gets right around the blades.
Where else would the exhaust go to, but past the blades? Somehow, I don't thinkthe locomotives are reburning exhaust, but rather using the exhaust flow to spinthe turbo to force additional clean air (beyond normal aspiration) into the
engine.
Is what is being said: that the engine is injecting more fuel before the
turbo gets up to speed to compensate with additional air being forced into
the cylinders? This thus causes more smoke and soot because of non-excess air
(normal diesels have excess air to fuel) in the fuel/air ratio (non-
stoichimetrically correct).
>
>Hope this helps!
>
> - Paul Tupaczewski
> Stevens Tech
> Hoboken, NJ
> u93_ptupacze@vaxa.stevens-tech.edu
>
--
Kershner Wyatt
kwyatt@ccscola.ColumbiaSC.ncr.com
My opinions are my own and aren't necessarily my employer's.
