Combustion chamber of high-speed diesel engine

Abstract

The invention discloses a combustion chamber of a high-speed diesel engine. The combustion chamber is cylindrically arranged at the end part of a piston rod, and the combustion chamber is characterized in that the combustion chamber sequentially comprises an inward contraction port, a throat port, a bottom groove and a boss from the top end of the piston rod to the bottom of the combustion chamber, wherein the inward contraction port is of an annular arc-shaped groove with the inner diameter which is gradually reduced from the top end of the piston rod, the throat port is of an annular arc-shaped bulge connected to the bottom edge of the inward contraction port, the bottom groove is of an arc-shaped groove arranged on the edge at the bottom of the combustion chamber, the inner diameter of the throat port is smaller than those of the inward contraction port and the bottom groove, the boss is of a spherical crown-like structure arranged at the center of the bottom of the combustion chamber, a diversion table is arranged between the bottom edge of the boss and the lower edge of the bottom groove, and the diversion table is of an annular arc-shaped raised structure. The combustion chamber disclosed by the invention can be used for preventing a high-pressure injected oil beam from being subjected to a wall impingement phenomenon, improving the fuel oil spatial distribution and oil-gas mixing uniformity, and further ensuring that the engine is higher in thermal efficiency and lower uin oil consumption and emission.

Description

technical field [0001] The invention relates to the technical field of light-duty diesel engines, in particular to a combustion chamber of a high-speed direct-injection diesel engine. Background technique [0002] The combustion chamber of modern direct-injection diesel engines is generally an ω-shaped combustion chamber, which is composed of a combustion chamber throat, a hemispherical boss, and a combustion chamber arc. The combination of arcs and radians has limited effect on improving the combustion process, especially the high-speed diesel engine combustion chamber space is relatively small, the K coefficient of the combustion chamber is low, the air utilization rate is relatively low, the combustion process organization is more difficult, and the thermal efficiency will be relatively low. For high-pressure injection above 1400bar, there is still a serious phenomenon that the fuel beam hits the wall, and the shape of the combustion chamber affects the rationality of the...

AI Technical Summary

Problems solved by technology

[0002] The combustion chamber of modern direct-injection diesel engines is generally an ω-shaped combustion chamber, which is composed of a combustion chamber throat, a hemispherical boss, and a combustion chamber arc. The combination of arcs and radians has limited effect on improving the combustion process, especially the high-speed diesel engine combustion chamber space is relatively small, the K coefficient of the combustion chamber is low, the air utilization rate is relatively low, the organization of the combustion process is more difficult, and the thermal efficiency will be relatively low

For high-pressure injection above 1400bar, there is still a serious phenomenon that the fuel beam hits the wall, and the shape of the combustion chamber affects the rationality of the airflow movement organization and the uniformity of the distribution of the mixture in the combustion chamber space, resulting in the utilization of air in the combustion chamber. Low efficiency, the combustion process cannot be fully carried out, resulting in poor engine emissions, high fuel consumption, and no further improvement in thermal efficiency

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