Fuel mass fraction

In combustion physics, fuel mass fraction is the ratio of fuel mass flow to the total mass flow of a fuel mixture. If an air flow is fuel free, the fuel mass fraction is zero; in pure fuel without trapped gases, the ratio is unity.^[1] As fuel is burned in a combustion process, the fuel mass fraction is reduced. The definition reads as

Y_{F}={\frac {m_{F}}{m_{\rm {tot}}}}

where

$m_F$ is the mass of the fuel in the mixture
$m_{\rm {tot}}$ is the total mass of the mixture

References

↑ Kanury, a. (1975). Introduction to Combustion Phenomena. New York: Gordon and Breach. p. 150. ISBN 0-677-02690-0.

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