Based on heavy-duty diesel engine,three-dimensional combustion simulation software was used to establish a three-dimensional numerical model,model calibration was completed based on experimental data,on the basis of the shape of the traditional ω combustion chamber of the original engine,a stepped combustor scheme is proposed and verified by experiment.The experimental results showed that compared with the tradi-tional ω-type combustion chamber,the stepped chamer fuel consumption ratio of the external characteristic of the diesel engine was reduced,and the smoke of the filter paper was also improved significantly,which is basically consistent with the simulation results.It provides reference for improving diesel engine economy,power per-formance and emission index via optimizing combustion system.
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