Air–fuel Ratio

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

Air–fuel ratio, abbreviated as AFR, is the mass ratio of air to fuel mixture present in an internal combustion engines. Because it is a ratio, it is unitless.


\(\large{ AFR = \frac {m_a} {m_f} }\)


\(\large{ AFR }\) = air–fuel ratio

\(\large{ m_a }\) = air mixture

\(\large{ m_f }\) = fuel mixture

Tags: Equations for Power Equations for Air