高热效率重型柴油机燃烧系统优化研究

This paper studiedonimproving the thermal efficiency of diesel engine, the combustion system of diesel engine is optimized, and the thermal efficiency of diesel engine is improved from two aspects: combustion chamber profile optimization and oil nozzle parameter optimization. Based on numerical simulation to guide the optimal matching of combustion chamber and injector, 5 depth, 2 types and 3 compression ratio combustion chamber profiles are designed, DOE simulation is carried out with different timing and injection angles, and the optimal scheme is recommended for trial production processing and test verification. The calculation results show that within 250 bar of the burst design boundary, the high compression ratio improves IMEP significantly. The injection angle of the injector is designed to be 150°, which is an improvement over the IMEP of the original machine at 147°; In the scheme design of cold EGR combustion system, the comprehensive performance of the dual-coiled combustion chamber is better. The experimental verification of three recommended line schemes shows that the predicted influence of combustion chamber shape and oil nozzle angle is basically consistent with the test trend.