Weak tumble rapid combustion system and gas engine

Abstract

The invention discloses a weak tumble rapid combustion system and a gas engine. The weak tumble rapid combustion system comprises a piston, a cylinder cover, an air intake channel and an exhaust channel, a combustion chamber is formed between the top of the piston and the cylinder cover, the cylinder cover is provided with an air intake throat and an exhaust throat, the section, close to the air intake throat, of the air intake channel is a tumble guide air channel, the axis of the tumble guide air channel is obliquely arranged relative to the bottom face of the cylinder cover, the upper sideface of the tumble guide air channel is an undershoot guide face obliquely arranged relative to the bottom face of the cylinder cover, the lower side face of the tumble guide air channel is an arc-shaped guide face sunken towards the bottom face of the cylinder cover, an eccentric chamfer is arranged at the lower end of the air intake throat, and the eccentric direction of the eccentric chamfer deviates along the direction of a central connecting line from the air intake throat to the air outlet throat. According to the weak tumble rapid combustion system, during air suction, fuel gas forms large-scale weak tumble motion in the air cylinder and is broken into small-scale turbulent flow in the last stage of compression, so that the flame propagation speed is increased, and the fuel gas utilization rate and the engine heat efficiency are improved.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a weak tumble fast combustion system and a gas engine. Background technique [0002] At present, natural gas engines are generally transformed on the basis of diesel engines, and the design of the cylinder head part often directly adopts the original diesel engine cylinder head structure. For a diesel engine, its combustion mode is diffusion combustion, and a certain degree of vortex helps the oil jet to mix with air, thereby improving the combustion process and reducing pollutant emissions. Among them, the vortex refers to the organized swirling movement of the gas around the axis of the cylinder. Gas fuel combustion is essentially premixed combustion, which does not require high vortex strength, and requires small-scale turbulent motion to form flame folds, thereby speeding up flame propagation and improving thermal efficiency. Among them, turbulent flow refers to many small ...

AI Technical Summary

Problems solved by technology

However, for gas machines, small-scale turbulence plays a crucial role in flame propagation, and thus, existing technologies are not conducive to the combustion of gaseous fuels

At the same time, limited by the slow flame propagation speed, the engine has a high tendency to knock, and it is impossible to use high compression ratio pistons to further improve thermal efficiency

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