Where is secondary air admitted on an oil burner nozzle?

In oil burner nozzles, secondary air is admitted around the tip to support the combustion process. This design allows for better mixing of air with the oil as it is being sprayed out of the nozzle, which helps to create a more efficient and stable flame. The secondary air contributes to the combustion by providing the necessary oxygen that promotes the burning of the fuel.

The placement of secondary air around the tip also allows for better control over the combustion characteristics. It aids in optimizing the flame shape and temperature, which is essential for achieving high efficiency and low emissions in oil burning systems. Proper combustion reduces the likelihood of soot formation and other combustion-related issues.

Alternative locations for air intake, such as inside the chamber, at the base, or from the top, do not provide the same level of efficiency and mixing as the admission of secondary air around the tip. Each of these other options would alter the dynamics of the flame adversely, affecting performance. Therefore, the correct choice of admitting secondary air around the tip is crucial for effective oil burning in stationary engineering applications.