What is the primary purpose of secondary air in combustion?

The primary purpose of secondary air in combustion is to improve burn efficiency. Secondary air is introduced into the combustion process after the initial burning phase, facilitating the complete oxidation of fuel. By providing additional oxygen, secondary air helps ensure that any unburned hydrocarbons are fully combusted, resulting in a more complete and efficient burn. This process not only enhances fuel efficiency but also reduces the formation of pollutants such as carbon monoxide and unburned particulate matter.

While enhancing flame color, controlling temperature, or creating a larger flame may relate to different aspects of combustion, these are not the main focus of secondary air. The effectiveness of secondary air primarily centers around facilitating a more complete and efficient combustion process.