Double-layer split-flow burning system of direct-injection diesel engine

Abstract

The invention relates to a double-layer split-flow burning system of a direct-injection diesel engine and belongs to the fields of engine mix gas formation and combustion. The double-layer split-flow burning system of the direct-injection diesel engine is characterized in that a combustion chamber is divided into an upper layer and a lower layer; the diameter of the upper layer part of the combustion chamber is greater than that of the lower layer part of the combustion chamber; the space between the top surface of a piston and the bottom surface of a cylinder cover is reduced; and a collision platform is arranged at the joint of the upper layer and the lower layer; an oil beam squirted by a multi-hole oil injector impacts the collision platform, one part of the oil beam is rebounded so that the secondary atomization is realized, one part of the oil beam flows to the upper layer and the lower layer of the combustion chamber along a guide surface, and the accumulation of spraying at the landing point and nearby is reduced through guiding and splitting; and the diffusion speed is rapid, the air rolling suction quantity is increased, thus the relative uniform mixed gas is rapidly formed, the combustion is fast and complete, and the economy and emission behavior of the diesel engine are improved. Compared with the double-layer split-flow burning system and the original machine burning system under a declared working condition, the oil consumption rate is reduced by 3%, and the discharge capacity of soot is reduced by 50%.

Description

technical field [0001] The invention relates to a direct-injection diesel engine double-layer split flow combustion system, which belongs to the field of engine mixture gas formation and combustion. Background technique [0002] At present, the excess air coefficient of the direct injection diesel engine is large, but it is easy to emit black smoke. The main reasons for this are the uneven distribution of the porous spray in the circumferential direction and the creation of over-concentrated areas at the point of spray fall. Part of the spray accumulates at and near the landing point, or forms an oil film, and the other part rebounds and spreads around. Because it is close to the wall of the combustion chamber, the amount of air involved is small, and an over-concentrated area is formed at the landing point of the spray. This makes the air utilization rate of the diesel engine low, the combustion is incomplete, the fuel consumption is high, and the soot emission is large. ...

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Problems solved by technology

[0003] In order to solve the problems of too rich mixture at the landing point of the porous spray, uneven distribution in the circumferential direction of the combustion chamber, and low utilization rate of air in the combustion chamber

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