What is the term for air added to a flame after ignition?

The term for air added to a flame after ignition is secondary air. This air is introduced into the combustion process to ensure that the fuel burns more completely and efficiently. Secondary air helps to enhance the combustion process by providing the necessary oxygen needed for the reaction once the flame has been established.

This additional air contributes to maintaining a stable flame and can help in reducing emissions by ensuring that there is sufficient oxygen to combust any remaining fuel particles. In many systems, the proper adjustment of secondary air is crucial for optimal performance and to prevent issues such as incomplete combustion, which can lead to higher levels of pollutants and reduced efficiency.

Understanding the role of secondary air is essential for HVACR professionals, as it directly affects both the efficiency of heating systems and environmental compliance regarding emissions.