1.No Air Mixing Before Injection: In diesel engines, air and fuel are not pre-mixed before entering the combustion chamber. Instead, the air is first compressed by the piston to create intense heat and pressure.
2.High-Pressure Injection: Diesel fuel injectors are designed to deliver fuel at extremely high pressures directly into the highly compressed and heated air within the combustion chamber. This high pressure is crucial for achieving efficient atomization and proper mixing of the fuel with the air.
3.Self-Ignition (Compression Ignition): Due to the high pressure and temperature of the compressed air, the injected fuel undergoes a rapid rise in temperature and spontaneously ignites. This phenomenon, known as compression ignition, eliminates the need for an external ignition device like spark plugs.
4.Optimized Combustion: The high-pressure injection process ensures that the fuel droplets are finely atomized, which promotes better mixing with the air. The absence of air mixing prior to injection allows for more precise control over the timing and quantity of fuel injected, resulting in improved combustion efficiency and smoother engine operation.
In summary, airless injection refers to the fuel injection process in diesel engines, where fuel is injected directly into highly compressed air. This enables efficient fuel-air mixing and compression ignition, eliminating the need for air-fuel pre-mixing and the use of spark plugs.
