Combustion chamber and gas engine

Abstract

The invention discloses a combustion chamber and a gas engine, the combustion chamber is used for the gas engine transformed from a diesel engine, the combustion chamber is combined with a weak tumble cylinder cover structure for use, and the combustion chamber comprises a cylinder cover bottom surface and a combustion chamber pit located at the top of a piston; the surface of the combustion chamber pit is a rotary smooth curved surface, the cylinder cover bottom face comprises a rotary arc-shaped cylinder cover pit located above the combustion chamber pit, and the center line of the combustion chamber pit is closer to the exhaust valve relative to the center line of the arc-shaped cylinder cover pit. The combustion chamber is of a good streamline curved surface structure, formation of tumble flow is facilitated, meanwhile, the combustion chamber pits and the arc-shaped cylinder cover pits are asymmetrically designed, energy loss in the tumble flow process can be reduced, turbulent kinetic energy in the combustion chamber is enhanced, the flame propagation speed is increased, and the heat efficiency of an engine is improved.

Description

technical field [0001] The present invention relates to the technical field of engines, in particular to a combustion chamber and a gas engine. Background technique [0002] At present, the design and development of natural gas engines are generally carried out on the basis of diesel engines. For diesel engines, the vortex generated by the swirling air passage helps to mix the oil beam with the air to a certain extent, so as to achieve high-efficiency combustion and low pollution. emissions. The gas engine is premixed combustion, the fuel has been mixed with air during the intake process, and after the spark plug is ignited to generate a fire nucleus, the ideal state is that there is a high turbulent kinetic energy in the cylinder during the combustion process. The increase of turbulent kinetic energy will speed up the flame propagation speed, which is of great significance for improving the combustion process of the gas engine and reducing the cyclic variation. If the lar...

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Problems solved by technology

[0004] Existing gas engine cylinder heads generally adopt diesel engine cylinder heads directly, and the bottom surface of the cylinder head is flat, that is, adopts a flat-top combustion chamber structure, which is not conducive to the tumble flow of the airflow in the cylinder

In addition, the existing gas engine pistons are generally modified on the basis of diesel engine pistons, and the combustion chamber pit 01 of the pistons mostly adopts a straight-mouth structure, such as figure 1 As shown, due to the existence of large-scale eddy current motion, it will affect the flame development form, resulting in high cycle fluctuations, limiting the flame propagation speed and the improvement of the thermal efficiency of the whole machine

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