In an atmospheric premix burner, what is the term for air entering around the flame?

In an atmospheric premix burner, the term used to describe the air that enters around the flame is secondary air. This secondary air is crucial because it assists in the complete combustion of the fuel by mixing with the gaseous fuel and any combustion products after the initial reaction has begun.

Primary air, on the other hand, generally refers to the air that mixes with the fuel before combustion occurs at the burner. Combustion air pertains to the total air required for combustion but doesn't specifically describe the air entering around the flame. Tertiary air is typically introduced in more complex burning systems to enhance combustion efficiency but is not a term commonly used for atmospheric premix burners specifically. Understanding the roles of these various types of air is important for controlling combustion processes and maintaining efficiency.