What is the purpose of the restrictor in the blast tube of an oil burner?

The restrictor in the blast tube of an oil burner serves the crucial function of creating air velocity. By narrowing the passage through which air flows, the restrictor increases the speed of the air entering the combustion chamber. This increased velocity is essential for ensuring that the fuel and air mix thoroughly, which contributes to more efficient combustion.

When air velocity is elevated, it helps in forming a better spray pattern from the oil nozzle, enhancing the atomization of the fuel. Efficient atomization allows for improved combustion efficiency, which is vital for optimal burner performance. High air velocity also aids in controlling the flames and maintaining stable burner operation.

While factors such as noise reduction, temperature increase, and fuel efficiency may also be affected indirectly by the operation of the burner, the primary role of the restrictor is to manipulate air flow to boost air velocity, making it a fundamental component in ensuring effective combustion in oil burners.