Combustion chamber of diesel engine

Abstract

The invention discloses a combustion chamber of a diesel engine. The combustion chamber comprises a central platform, a pit area, a lip, a step area and a piston top; one end of a boundary curve of the pit area is connected with a platform side generatrix extending from the central platform side to the bottom of the combustion chamber, and the other end of the boundary curve of the pit area is connected with the lip through a diversion line extending to the top of the combustion chamber; the lip is connected with the top surface of a piston through a step-shaped curved surface, and the step area is formed above the step-shaped curved surface; an included angle formed between the diversion line and the radial outside horizontal direction of the combustion chamber is an acute angle; and whenthe piston is located at the top dead center, the ratio of the length of the connecting line of the contact point of an oil beam line and the diversion line and the starting point of the bottom end of the diversion line to the total length of the diversion line is within a preset proportion range. According to the technical scheme, the area of an oxygen-enriched area surrounded by high temperature is reduced to inhibit generation of nitric oxide, meanwhile, the mixed gas is guided to move towards the center of an air cylinder to accelerate later oxidation of soot, and the effect of effectively reducing emission of nitric oxide and the soot is achieved while the thermal efficiency of the diesel engine is not reduced.

Description

technical field [0001] The invention relates to the technical field of diesel engines, in particular to a diesel engine combustion chamber. Background technique [0002] At present, the most stringent California heavy-duty diesel engine emission regulations in the world require that the nitrogen oxide emission be reduced to one-tenth of the National VI emission regulations on the premise that the soot emission is equivalent to the National VI emission regulations. However, reducing nitrogen oxide emissions often requires the loss of a certain amount of thermal efficiency of the diesel engine. In addition, the formation of nitrogen oxides and soot is closely related to the in-cylinder oil-gas mixing process and combustion process. Due to the combustion characteristics of diesel engines, it is difficult to reduce both at the same time. Only by precise design can it be realized. [0003] The existing combustor designs only consider accelerating the mixing rate and increasing ...

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Problems solved by technology

However, this idea is difficult to achieve a good effect of controlling nitrogen oxides in heavy-duty diesel engines, or under conditions that require large fuel injection volumes such as heavy loads

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