Air Flow Rate ($AFR$):

$$AFR = FCR \cdot SA \cdot e$$

Where:

• $AFR$ is the air flow rate, in kilograms per hour (kg/hr).
• $FCR$ is the fuel consumption rate, in kilograms per hour (kg/hr).
• $SA$ is the stoichiometric air, in kilograms of air per kilogram of fuel (kg air/kg fuel).
• $e$ is the equivalence ratio, typically between 0.3 and 0.4.