Burning principles for diesel engines
The combustion process for diesel engines is a complex and sophisticated energy conversion process. Its combustion rationale is based mainly on compressed ignition. In the working cycle of diesel engines, the air is first inhaled and highly compressed, resulting in a sharp increase in the air temperature inside the tank. When diesel is sprayed into high-temperature and high-pressure air, diesel is quickly mistified and evaporated, mixing with high-temperature air to form a flammable mixture of gas。
Since the temperature in the tank has exceeded the self-fired temperature of diesel, the mixed gas will burn itself. The combustion process is not instantaneous, but is divided into multiple stages. The first was a delay in the fire, during which the fuel was physically and chemically prepared; followed by a fast-burning period, with a high rate of combustion and a sharp rise in pressure; followed by a slow-burning period, with a lower rate of combustion and a relatively small change in pressure; and finally, a late-burning period, when the fuel was still burning but contributed less to engine performance。
Methods to improve the efficiency of diesel combustion
In order to improve the combustion efficiency of diesel engines, the following can be useful:
1. Optimization of oil-jet systems: use of high-pressure co-orbit oil-jet technology to accurately control the timing and volume of oil-jet so that fuel can be distributed more evenly within the cylinders and increase the adequacy of combustion。
2. Improvement of gas intake systems: increased gas intake and improved quality and evenness of gas intake contribute to a more desirable mix of flammable gas。
3. Increase compression ratio: an appropriate increase in compression ratio increases temperature and pressure in the tank and promotes fuel combustion。
4. Optimizing combustion chamber shapes: rationally designed combustion chamber shapes and sizes that improve the flow of air within combustion rooms and promote fuel-air mixing and combustion。
5. Implementation of turbo-pressurization technology: increased gas pressure and inflating efficiency, thereby increasing combustion efficiency。
6. Improving fuel quality: the use of high-quality, clean diesel fuel to reduce impurities and moisture contributes to the stability and adequacy of combustion。
7. Accurate electronic control: use advanced electronic control systems to monitor and adjust the working parameters of engines in real time in order to adapt to different conditions and improve combustion efficiency。
The following table compares the advantages and disadvantages of different methods of improving combustion efficiency:
Advantages of methodology
Optimizing oil-jet systems
Improved fuel fogging and fuller combustion
Higher cost, higher technology
Improvement of the gas intake system
Increased gas intake for mixing gas formation
Complex system modifications
Increase compression ratio
Increased combustion temperature and pressure
Requirements for engine materials and manufacturing processes high
Optimizing combustion chamber shapes
Improved air current movement for combustion
Design and development are difficult
Use turbine booster technology
Increased inflatability
Increased costs, complex maintenance
Improving fuel quality
Burning stable, adequate
Higher cost of quality fuel
Accurate electronic control
Real-time adjustment and adaptation
It's complicated and reliable
Overall, improving the combustion efficiency of diesel engines requires a combination of factors and a combination of measures to optimize their performance, economy and environmental protection。
