[Stoves] Limiting factor for secondary burn?

[frank]

Stovers,
I noticed that the primary burn seems to have a narrow window regarding 
the amount of air to keep the burn glowing. Too little and the burn 
stops and too much and the fuel burns to fast reducing the amount of 
wood gas to go to the secondary burn (?). It seems this air flow is 
different for different fuels so controlling the air to the primary burn 
must be the challenge for wood gas stoves.

So what determines the size of the secondary burn? It seems the diameter 
of the fuel box (if we want an even burn across) would determine the 
size of the secondary flame(?). and the required air needed(?) As the 
secondary burn continues the fuel dropped to the bottom so it seems the 
height of the fuel determines the length of time the fire is going(?) If 
this is right, the diameter of the fuel box determines the air flow of 
wood gas to the secondary burn and the size of the burner required (?).

Is this how stoves are designed?
I am trying to determine the total volume of air required for a typical 
wood gas stove that burns small fuel during one filling.

Thanks
Frank




  



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Frank Shields
Soil Control Lab
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