Fuel Atomisation

[Greg Hermann]

At 12:30 PM 12/10/01, Arnaud Westenberg wrote:
>Bernd Felsche wrote:
>
> > How many Joules are going to be absorbed in the vapourization process?
> > Unless you're evaporating water, you won't be removing significant
> > heat without running very rich mixtures.
>
>Running very rich mixtures to aid cooling is quite a common strategy,
>especially in racing applications. So delaying vaporization until the
>charge is in the cylinder, without the need to go extra rich, would
>result in the benefits Greg mentioned.
>
> > Reduces the pressure by how much to vapourize a liquid droplet into a
> >  gas?
>
> >> Good atomization also leads to more uniform distribution of the fuel
> >>  throughout the charge, leading to better, faster combustion (also
> >>  more power and efficiency here).
>
> > And increases the tendency to detonate (knock).
>
>The faster flame propagation would expose the end gasses _shorter_ to
>the increased temp/pressures, hence reduce the tendency to knock.
>
>Besides the vaporization heat absorbed by the fuel during compression,
>the faster burn rate of the more homogeneous distributed fuel allows for
>  more ignition retard. Obviously the retard results in lower
>compression end pressures and temperatures, reducing the tendency to knock.
>
>___
>
>Arnaud

Glad to see someone else understands, Arnie !!

Greg


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