| 摘要:在船用高压共轨柴油机TBD234V6上进行了中低负荷工况下EGR率对柴油机燃烧排放性能影响的试验研究。应用AVL-FIRE软件建模，对柴油机缸内燃烧过程进行CFD仿真分析。仿真和试验研究结果表明:中低负荷工况下采用EGR能够有效降低NOx的排放。EGR率较小时，对柴油机的性能影响较小；当EGR率较大时，柴油机的工作性能恶化，soot排放迅速增多。特定工况下的CFD模拟结果显示:随着EGR率的增加，燃烧过程的最高压力和最高温度降低，放热速率减小，燃烧过程变得平缓。 |
| 关键词: 船用柴油机 EGR 燃烧 排放 |
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| Simulation and Experimental Study of the Influence of EGR Rate onthe Performances of Combustion and Emission at Low andNormal Loads of Marine Diesel Engine |
| Wei Yukun,An Shijie,Zhang Zhiyou |
| College of Power Engineering, Naval University of Engineering, Hubei Wuhan 430033 |
| Abstract:This study examined the impacts of EGR rate on the performances of combustion and emission at low and normal loads working conditions on a TBD234V6 high pressure common rail marine diesel engine. In addition, the combustion process in cylinders was predicted with CFD simulation using a model established by AVL-FIRE software. Simulation and experimental results showed that EGR rate effectively reduced NOx emission at low and normal loads working conditions. At low EGR rates, diesel engine working performance was little impaired. But at high EGR rates, the working performance deteriorated, and the soot emission increased rapidly. The simulation results also showed that the increase of EGR rate at specific working condition reduced the maximum pressure, maximum temperature and the heat release rate of the combustion process, which smoothed the combustion process. |
| Key words: marine diesel engine EGR combustion emission |
