Diesel engines are engines that burn diesel for energy release
It can be divided into: Engineering machinery supporting diesel engine Diesel engine for agricultural machinery Downhole equipment supporting diesel engine Vehicle supporting diesel engine Forklift supporting diesel engine Compressor supporting diesel engine Generator set, welding machine, pump supporting diesel engine Diesel engine for power generation Diesel engine for power generation Marine engine supporting diesel engine
Divided by displacement cylinder Single-cylinder and multi-cylinder diesel cylinders
Divided by work cycle Two-stroke diesel engines and four-stroke diesel engines;
Other categories: Vertical, horizontal, inline, oblique, V-shaped, X-shaped, W-shaped, opposed cylinders, opposed pistons, etc
The advantages of diesel engines are high torque and good economic performance. The working process of a diesel engine is much the same as that of a gasoline engine. Each working cycle also experiences four strokes of intake, compression, work, and exhaust. However, because the diesel fuel is diesel, its viscosity is greater than that of gasoline and it is not easy to evaporate, but its autoignition temperature is lower than gasoline. Therefore, the formation and ignition of combustible mixtures are different from those of gasoline engines. The main difference is that the mixture in the cylinder of a diesel engine is compression-ignited, not ignited.
The characteristics of traditional diesel engines: good thermal efficiency and economy. Diesel engines use compressed air to increase the air temperature so that the air temperature exceeds the diesel’s spontaneous ignition point. At this time, the diesel, diesel spray and air are mixed together to ignite and burn at the same time. . Therefore, no ignition system is required for diesel engines. At the same time, the diesel fuel supply system is relatively simple, so the reliability of diesel engines is better than gasoline engines. Due to the limitation of detonation and the need for diesel self-ignition, the compression ratio of diesel engines is very high. Thermal efficiency and economy are better than gasoline engines. At the same time, at the same power, diesel engines have large torque and low speed at maximum power, which is suitable for the use of trucks.
However, due to the high working pressure of the diesel engine, the relevant parts have high structural strength and rigidity, so the diesel engine is relatively bulky and bulky; the diesel pump and the nozzle are manufactured with high precision requirements, so the cost is high; in addition, the diesel engine works rudely , Vibration and noise are large; diesel is not easy to evaporate, and it is difficult to start when it is cold in winter.
Diesel engines are mainly used for final supporting products. For example, high-power high-speed diesel engines are mainly used for heavy-duty vehicles, large passenger cars, construction machinery, ships, and generator sets.