A Lip Jet Combustion System for Direct Injection Diesel Engine

Abstract

The invention relates to a lip jet combustion system of a direct-injection diesel engine, comprising a fuel injector and a combustion chamber composed of a diesel engine cylinder head, a cylinder liner and a piston; into the combustion chamber. The lip jet combustion system of the direct injection diesel engine of the present invention can not only greatly increase the oil-gas mixing space in the cylinder, but also realize the active guidance of the local fuel flow in the combustion chamber to a specific area by using the lip jet principle and the bottom surface structure of the diesel engine cylinder head, so that In the combustion chamber, the simultaneous combustion process of the inner zone, the middle zone and the outer zone is formed, which realizes the combustion organization concept of dispersing the fuel in the cylinder and then breaking it one by one, and greatly improves the utilization rate of the air in the cylinder. Under the calibrated working conditions, compared with the traditional combustion system, the lip jet combustion system can reduce the fuel consumption by 4% and the soot emission by 80% under the same NOx emission.

Description

technical field [0001] The invention belongs to the technical field of engine mixture gas formation and combustion, and in particular relates to a lip jet combustion system of a direct-injection diesel engine. Background technique [0002] At present, in response to the upgrade of emission regulations, most diesel engines use EGR (exhaust gas recirculation) in-cylinder combustion technology to reduce NOx emissions. The result is that the mixture of oil and gas in the cylinder becomes poor, resulting in fuel consumption and soot emissions of diesel engines. raised. Therefore, while using EGR technology, corresponding measures must be taken to strengthen the mixing of fuel and air in the cylinder in order to meet the requirements of emission and fuel consumption regulations. [0003] In order to strengthen the mixing effect of oil and gas in the cylinder, high fuel injection pressure technology is applied to the diesel engine combustion system, but the higher the fuel injecti...

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Problems solved by technology

[0005] The prior art discloses a direct-injection diesel engine double-layer split combustion system. The combustion system divides the combustion chamber into upper and lower layers, and can distribute a small part of fuel to the outside of the combustion chamber pit for mixed combustion. To a certain extent, it can Increase the oil-air mixing space in the cylinder, but the effect of improving the oil-air mixing is not obvious

[0006] The prior art also discloses a collision split combustion chamber for a diesel engine, which divides the combustion chamber into a central part and a top gap part by increasing the height of the head gap, and the oil beams flow to the combustion chamber respectively through the simple diversion effect of the impact wall and the ring belt. After mixing and burning with air in the center of the chamber and the headspace, the oil-air mixing space in the headspace is indeed significantly increased to a certain extent. However, due to the lack of reasonable air flow organization of a large amount of fuel introduced in this area, the oil-air mixing deteriorates.

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