Which term describes air that mixes gas before combustion?

Which term describes air that mixes gas before combustion?

• A. Primary air
• B. Secondary air
• C. Processed air
• D. Outside air

Answer: (A)

Air that mixes with gas before combustion is primary air. This is the portion of combustion air that blends with the gas inside the burner (often in the mixing tube or nozzle) to form the combustible gas–air mixture before ignition. The fuel-to-air ratio set by this mixing influences flame stability, ignition, and efficiency. Secondary air, in contrast, is introduced after the mixture leaves the burner to complete combustion in the flame and help regulate temperature. Outside air is simply ambient air from the surroundings, while processed air isn’t a standard term used for this context.

Air that mixes with gas before combustion is primary air. This is the portion of combustion air that blends with the gas inside the burner (often in the mixing tube or nozzle) to form the combustible gas–air mixture before ignition. The fuel-to-air ratio set by this mixing influences flame stability, ignition, and efficiency. Secondary air, in contrast, is introduced after the mixture leaves the burner to complete combustion in the flame and help regulate temperature. Outside air is simply ambient air from the surroundings, while processed air isn’t a standard term used for this context.