[Stoves] [Gasification] combustion math question (help needed)

[David G. LeVine]

At 01:58 PM 11/16/2007, you wrote:
> >Hydrogen has by far the highest burning velocity - ~3 m/s compared to
> >0.4 m/s for most fuels.  This lends some of hydrogen's advantages to
> >mixtures with all other fuels.
>
>I am trying to understand the 'burning velocity' concept. Is this
>determined by and does this mean that hydrogen can come out of a pipe at
>a rate of up to 3 m/s and still have combustion?
>and wood gas (without H) can be feed at a rate of up to 0.4 meters per
>second to the secondary?

Actually, it means that in an open environment with the gasses at 
standard temperature and pressure, the flame front will propagate at 
a specific speed from a point of ignition.

To see this in real life, put a line of gasoline on a non-combustible 
surface, remove the gasoline dispenser a LONG way away.  Light one 
end.  The flame front does not instantly go the full length, but 
moves quickly to the other end.  DO NOT DO THIS INDOORS OR USE A 
LARGE QUANTITY OF GASOLINE!  Charcoal lighter fluid and kerosine on a 
piece of string are safer ways to demonstrate this.


David G. LeVine
Nashua, NH  03060