Discussion
A primary zone receives \( 12 \ \mathrm{kg/s} \) of air with a fuel flow of \( 0.8 \ \mathrm{kg/s} \). Its local air-fuel ratio is
Answer: D
Dividing gives 15 to 1, essentially stoichiometric for kerosene. That is precisely the point of dividing the air: the zone where combustion must be self sustaining burns at the ratio that gives the fastest and hottest flame.
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