Necking-down type combustion chamber

Abstract

The invention relates to the field of engines, in particular to a necking-down type combustion chamber. The necking-down type combustion chamber comprises a combustion chamber body. The combustion chamber body comprises an opening, a throat and a bottom face. The throat comprises a throat upper edge, a throat lower edge, an annular arc protrusion and a throat opening part. The plane where the throat opening part is located divides the combustion chamber body into an upper-layer flow guiding cavity and a lower-layer combustion cavity. The flow guiding cavity is defined by a flow guiding side wall arranged between the opening and the throat upper edge. The flow guiding side wall gradually outwards extends to the opening from the throat upper edge. The combustion cavity is defined by a combustion side wall arranged between the throat lower edge and the bottom face, and the combustion side wall gradually shrinks to the throat lower edge from the bottom face. The throat opening part is in acircular shape, and the bottom face is a circular flat bottom face. Through the flow guiding action of the flow guiding cavity, extrusion flow is guided to directly flow into the combustion chamber body, the ignition stability is improved, and the combustion speed is increased.

Description

technical field [0001] The invention relates to the field of engines, in particular to a necking type combustion chamber. Background technique [0002] At present, the piston combustion chamber of the gas engine is mainly a straight piston combustion chamber, and its intake vortex and compression vortex are relatively weak, resulting in low combustion tumble and turbulent intensity, insufficient oil-gas mixing, and unsatisfactory combustion quality. In order to make the gas burn quickly and fully in the combustion chamber, the researchers tried to increase the squeeze flow area of ​​the piston by shrinking the mouth, strengthen the flow in the cylinder, increase the turbulent kinetic energy, and accelerate the combustion speed, such as the Chinese utility model patent with application number 201520598758.X In the disclosed combustion chamber of a piston of a gas engine, the mouth of the body is provided with a throat fillet protruding from the side wall of the body to the ce...

AI Technical Summary

Problems solved by technology

[0002] At present, the piston combustion chamber of the gas engine is mainly a straight piston combustion chamber, and its intake vortex and compression vortex are relatively weak, resulting in low combustion tumble and turbulent intensity, insufficient oil-gas mixing, and unsatisfactory combustion quality

In order to make the gas burn quickly and fully in the combustion chamber, the researchers tried to increase the squeeze flow area of ​​the piston by shrinking the mouth, strengthen the flow in the cylinder, increase the turbulent kinetic energy, and accelerate the combustion speed, such as the Chinese utility model patent with application number 201520598758.X In the disclosed combustion chamber of a piston of a gas engine, the mouth of the body is provided with a throat fillet protruding from the side wall of the body to the center of the body, so that the mouth of the body forms a constriction relative to the lower part, so that the engine When the gas burns in the combustion chamber, it is guided by the rounded corner of the throat. After the gas is injected to the bottom of the combustion chamber, the arc-shaped pit at the bottom rolls to cause a strong squishing effect. However, the researchers found that the piston moves to the top dead center. When the squeeze flow has no guiding effect, the strength is small and the turbulent kinetic energy level cannot be improved, and the necking method cannot fully play the role of increasing the turbulent kinetic energy in the cylinder and accelerating the combustion speed

Images