Combustion system of vortex-type diesel engine

Abstract

The invention discloses a combustion system of a vortex-type diesel engine. The system comprises a main combustion chamber and a vortex chamber; the main combustion chamber is positioned between an air cylinder cover and the top surface of a piston; an embedded lump of the vortex chamber is provided with a vortex channel which communicates the vortex chamber and the main combustion chamber; the side close to the center of the vortex chamber, of the cross section of the vortex channel which is vertical to the gas circulation direction is a straight line, while the side close to the wall of thevortex wall of the cross section of the vortex channel which is vertical to the gas circulation direction is an arc line; the straight line side and the arc line side smoothly transit through an externally-arch circular arc line; and the area of the cross section of the vortex channel in the gas circulation direction is not changed, and the length-width ratio D / C of the cross section is 2.75-2.85. The structure form of the vortex chamber of the combustion system enables the vortex strength in the whole vortex chamber is relatively uniform, the oil ejected by a fuel injector has enough time tobe mixed with the vortex gas, more uniform mixed gas is obtained, the combustion efficiency is improved, the economic property is improved, the emission is reduced, the starting capability is lowered, and the reliability of the fuel injector is also improved.

Description

technical field [0001] The invention belongs to the field of design and manufacture of diesel engine parts, in particular to a combustion system of a vortex diesel engine. Background technique [0002] Compared with the direct injection engine, the vortex chamber diesel engine has the advantages of soft operation, low noise and low emission. But the economy and cold start performance are not as good as direct injection diesel engines. The volume of the vortex chamber of the conventional vortex engine accounts for more than 60% of the total combustion chamber volume, so the heat dissipation area is larger and the heat loss is larger. In order to obtain a larger vortex, the vortex channel The ratio of the cross-sectional area to the cross-sectional area of ​​the cylinder block is small, about 0.7% to 0.8%, and the narrow eddy current channel causes a great flow loss. The current small-bore diesel engine is limited by the space of the vortex chamber, and less use of glow plugs....

AI Technical Summary

Problems solved by technology

However, there are two disadvantages in the connection channel of this cross-sectional shape: 1. Although it improves the vortex intensity close to the vortex chamber wall, it weakens the vortex intensity in the center of the vortex chamber, and the mixing effect of fuel and gas cannot reach the best; 2. .Although the gradually expanding shape reduces the flow loss of the power stroke, it increases the loss when the airflow passes through the channel during the compression stroke

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