Core definition and working principle of air-cooled diesel engine
2025-07-08
An air-cooled diesel engine is an internal combustion engine that uses diesel as fuel, compresses air to a high temperature (close to the self ignition point of diesel), and injects diesel to achieve compression ignition. The core heat dissipation method relies on the fan forcing airflow through the heat dissipation fins on the surface of the cylinder block and cylinder head, dissipating the heat generated by combustion into the air. The working cycle includes four strokes: intake, compression, power generation, and exhaust
Intake stroke: The piston descends and air is drawn into the cylinder;
Compression stroke: The piston moves upward, compressing the air to 500-700 ℃ and reaching a pressure of 40-50 atmospheres;
Power stroke: The fuel injector atomizes diesel under high pressure and sprays it into the cylinder. The diesel self ignites to produce high-temperature and high-pressure gas, which pushes the piston down to do work;
Exhaust stroke: The piston moves upward, and the exhaust gas is discharged through the exhaust valve.
Key difference: Compared to water-cooled diesel engines, air-cooled models have a more compact structure without water pumps, water pipes, water tanks, and other components, but the heat dissipation efficiency depends on the fan airflow intensity.
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