Final answer:
The correct term for the introduction of air into the combustion chamber after the oil has left the nozzle is 'Secondary air injection', which is important for complete combustion and efficiency.
Step-by-step explanation:
The introduction of air from the blower or fan into the combustion chamber after the oil has left the nozzle is referred to as: b) Secondary air injection. This process is important for ensuring complete combustion of the fuel, which can increase efficiency and reduce the emission of pollutants. In various types of combustion systems, such as engines and furnaces, secondary air injection is used to introduce additional oxygen to aid in the complete burning of fuel. This can be observed in devices like the Bunsen burner, as well as in high-powered aspirators and four-stroke internal combustion engines where proper air-fuel mixing and combustion are crucial for operation.