Combustion system of diesel engine

Abstract

The invention relates to a combustion system of a diesel engine, which belongs to the field of injection and combustion of fuel of diesel engines. The combustion system mainly comprises a combustion chamber, wherein the combustion chamber is arranged at the top of a piston with the diameter smaller than 150mm; and a fuel beam of a fuel injector positioned in the center of a cylinder cover is matched with the combustion chamber. The fuel injector is formed by combining one or more circular injecting holes and combined injecting holes with different hole diameters and matched with a shallow basin type combustion chamber or a shallow omega type combustion chamber by utilizing oil beams with different penetration distances and different spreading angles. Because the combustion system is combined by adopting various injecting holes, the optimal matching between the fuel beams and the combustion chamber is easy for realization; the intense disturbance can be formed when the fuel in injecting sub-holes of the combined injecting holes are converged, the turbulence function is added, and the atomization is improved; and the combustion system which configures a combined injecting hole nozzle with large spray diffusance and a long penetration distance and a short penetration distance of the adjacent fuel beams on the combustion chamber greatly improves the air utilization ratio, promotes combustion, reduces discharge and heat transfer loss and improves economy.

Description

technical field [0001] The invention relates to a diesel engine combustion system, which belongs to the field of fuel injection and combustion of diesel engines. Background technique [0002] As we all know, the combustion chambers of direct-injection diesel engines with a cylinder diameter less than 150mm are mostly ω-shaped or bell-shaped. This is because the spray is concentrated on the periphery of the combustion chamber, and there is no spray near the center of the combustion chamber. The bulge reduces the air in the central part, so that the air is concentrated to the periphery of the combustion chamber like a spray. In this way, the combustion chamber is relatively deep, the surface-to-volume ratio is large, and the heat transfer loss is large; the ratio of the combustion chamber diameter to the cylinder diameter is small, and the air in the clearance of the piston top cannot be fully utilized; the thickness of the piston top is increased, and the mass of the piston i...

AI Technical Summary

Problems solved by technology

In this way, the combustion chamber is relatively deep, the surface-to-volume ratio is large, and the heat transfer loss is large; the ratio of the combustion chamber diameter to the cylinder diameter is small, and the air in the clearance of the piston top cannot be fully utilized; the thickness of the piston top is increased, and the mass of the piston is increased.

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