In a diesel engine, how do higher injection pressures affect combustion?

Higher injection pressures play a significant role in enhancing the combustion process in diesel engines, primarily by improving fuel atomization. When fuel is injected at higher pressures, it is more effectively broken into smaller droplets. This fine atomization increases the surface area of the fuel, allowing for a more efficient mixing with the air in the combustion chamber.

As a result, the combustion process becomes more complete, leading to a more controlled and efficient burn. This efficiency contributes to reduced emissions, as there is less unburned fuel and fewer particulate matter and nitrogen oxides produced as byproducts of combustion.

Increased fuel atomization also helps in achieving the right temperature and pressure conditions within the combustion chamber, which further optimizes the combustion event, reducing the likelihood of knocking and leading to better overall engine performance.