Fuel-Air Mixing and Combustion Characteristics of Lateral Swirl Combustion System and Multi-Swirl Combustion System
Combustion performance experiments were carried out on a single-cylinder diesel engine to study the influ-ences of a lateral swirl combustion system(LSCS)and a multi-swirl combustion system(MSCS)on engine performance.Combined with simulation analysis,the fuel-air mixing and combustion characteristics were revealed for the LSCS and the MSCS respectively.Experimental results show that under low loads and high excess air coefficients,the MSCS ob-tains better combustion performance than the LSCS with the maximum reduction in fuel consumption of 3.6 g/(kW·h),in soot emission of 0.13 g/(kW·h)and in combustion duration of 2.6° CA.However,under heavy loads and low excess air coefficients,the LSCS shows better combustion performance than the MSCS with the maximum reduction in fuel con-sumption of 2.6 g/(kW·h),in soot emission of 0.56 g/(kW·h)and in combustion duration of 2.8° CA.Simulation results indicate that,when the engine load decreases or the excess air coefficient increases,the fuel spray penetra-tion ability becomes weakened,and the circular ridge of the MSCS chamber improves fuel-air mixing quality more effectively.However,when the engine load increases or the excess air coefficient decreases,the fuel spray pene-tration ability is enhanced.The split-flow creation of the LSCS chamber improves the fuel-air mixing quality more evidently,while the circular ridge of the MSCS chamber hinders the diffusion of fuel spray.
direct-injection diesel enginelateral swirl combustion systemmulti-swirl combustion system
万方数据
维普
