均质混合气压缩着火燃烧过程的模拟研究

NUMERICAL SIMULATION ON HCCI COMBUSTION PROCESS

本文采用并行计算对HCCI燃烧过程进行三维数值模拟与解析,对比了采用不同数量CPU与不同规模机理时的计算效率,分析了采用不同机理以及单区和三维HCCI模拟的计算结果的影响。结果表明,合理采用并行计算和简化机理可以大幅度提高HCCI模拟计算效率。三维HCCI模拟相比于单区模拟显著提高了燃烧和排放的计算精度;HCCI燃烧过程中缸内存在明显的温度分层,燃烧呈现顺序放热。

In this paper,HCCI combustion process was numerically simulated by using parallel computation.The cases with detailed and reduced reaction mechanisms were calculated with 1,2,4, 8,16 CPUs respectively and the corresponding computational efficiency were discussed.The results show that 3D CFD/Chemistry model improves the accuracy of HCCI simulation significantly compared with using 1-zone model.Temperature stratification leads to sequential heat release during HCCI combustion process.