Design and Optimization Analysis of Combustion Chamber for Equivalent Ratio Combustion Gas Engine

Four types of combustion chambers, including constricted type, shallow pit, flat top, and spherical, were proposed for the equivalence ratio combustion gas engines, and relevant calculations were conducted to explore the combustion characteristics. The results show that the deep pit type shows good flow characteristics, such as high Turbulent Kinetic Energy (TKE) and high tumble flow, exhibiting quick flame spread and excellent combustion characteristics; The constricted combustion chamber generates TKE and rolling flow near the spark plug, resulting in a poor flame formation process. Meanwhile, the low compression height reveals the poor flame propagation towards the periphery of the combustion chamber; The spherical combustion chamber performs well in the flame formation and development cause of rolling flow and TKE generation near the spark plug, However, due to wall interactions, the flame propagation process is relatively poor; Overall, the balance between compression height and combustion chamber depth must be considered in combustion design to optimize the in cylinder flow and combustion characteristics of the engine.