The invention discloses a heavy
natural gas engine
combustion system. The
system comprises an air cylinder and a cylinder cover covering the air cylinder, the cylinder cover is provided with a composite air
inlet channel composed of a vortex air
inlet channel and a straight tumble air
inlet channel and communicates with the interior of the air cylinder through an air inlet gate provided with an air
inlet valve, the air
inlet valve is arranged on a
valve seat, The air inlet gate is located in the whole
valve seat, two exhaust passage inlets communicate with the interior of the air cylinder through exhaust valves arranged on the cylinder cover, a
spark plug device is installed in the center of the bottom face of the cylinder cover, a
steel piston is arranged in the cylinder cover, and the bottom face of the cylinder cover, the inner wall face of the air cylinder and the top face of the
piston define a space which serves as a
necking-down type
combustion chamber, and
gas supply and injection systems are respectively arranged on the two gas inlet channels or the bottom surface of the cylinder cover. The
system is simple and compact in structure and convenient in manufacturing and
assembly, low heat dissipation is achieved through the
steel piston, meanwhile, inlet air flow can form
oblique axis vortex around the central axis of the cylinder through the composite air inlet channel, turbulent
kinetic energy in the cylinder is improved, and then heat efficiency is improved.