What does the minimum delivery pressure for diesel engine fuel oil injection primarily depend on?

The minimum delivery pressure for diesel engine fuel oil injection primarily depends on the firing pressure in the engine. Firing pressure refers to the pressure within the combustion chamber at the point of ignition when the fuel is injected into the cylinder. This pressure significantly influences the atomization and penetration of the fuel into the combustion chamber. To ensure efficient combustion, the fuel must be injected with sufficient pressure to overcome the firing pressure, allowing for proper mixing of air and fuel. This relationship is crucial for safe and efficient engine operation, as inadequate fuel pressure can lead to poor engine performance and increased emissions.

While the other factors, such as the degree of cylinder air turbulence, compression ratio, and duration of the combustion period, play important roles in the overall combustion process, they do not directly dictate the minimum fuel injection pressure required for effective injection. For instance, cylinder air turbulence affects the mixing of air and fuel, and the compression ratio impacts the temperature and pressure at the time of ignition, but the critical factor governing the fuel injection pressure is primarily tied to the firing pressure within the engine.