Weaver Flame Speed 2

[chalfast]

I have been searching the web and can not find any information on how to calculate the weaver flame speed. Can anybody help me out? I am trying to calculate it for a stream consisting of mainly H, CH4, CO2, CO, and N.

 

[hacksaw]

you have to consult the reseach literature or any of several monographs on combustion processes

 

[StoneCold]

chalfast
Maybe look in the flame arrestor sites like enardo.
They are also interested in that kind of thing.

StoneCold

 

[Mutt]

I have this formula for flame speed from way back when but don’t know source or method any more. Is still being used by ex-employer successfully for checking burners on town-gas mixtures. I don't work there anymore and don't have that part of the file with me, just the calc method! Not an in house method, was sourced from literature.

For a mixture of H2, CO, CO2, CH4, N2, Ar, C3H8. (The C3H8 volfrac was at low levels ,<3 vol%, and used to represent all HC heavier than CH4 in the gas)

Flame speed factor :
FFTot = Volfrac H2 * 339 + Volfrac CO * 61 + Volfrac CH4 * 148 + volfrac C3H8 * 398

Molar stochiometric air demand factor :
AFTot = Volfrac H2 * 2.39 + Volfrac CO * 2.39 + Volfrac CH4 * 9.55 + Volfrac C3H8 * 23.87

Volfrac inerts :
Volfracinerts = Volfrac CO2 + Volfrac N2 + Volfrac Ar


FS = FFTot / (AFTot + 0.05*(Volfracinerts) + 1 – 18.8 * VolfracO2)

Using this method, yields hydrogen as a flame speed of 100.

NB : Volfrac O2 was always zero for our mixes.

 

[Mutt]

Oops, in above FS formula use 5 not 0.05. Formula can be referenced to

http://www.ferc.gov/industries/gas/gen-info/fastr/HTMLAll/044252.HTM

Does not give Flame speed factors though. Need to find these elsewhere for components other than the ones I have listed above.