| 摘要:采用某船用中速单缸柴油机进行了EGR对性能及排放影响的仿真研究,并进行了试验验证。研究结果表明,采用EGR技术后,NOx加权排放下降到1.94(g(kWh)-1),但加权燃油消耗率上升至9.93(g(kWh)-1)；通过提前喷油和增加EGR率相结合进行优化,虽然NOx加权排放上升到2.09(g(kWh)-1),但加权燃油消耗率下降至4.36(g(kWh)-1),柴油机燃油经济性得到明显优化。试验验证显示:仿真和试验结果吻合较好,表明经标定的DI-jet燃烧模型精度满足要求,能较准确预测柴油机性能及排放。 |
| 关键词: 船用中速单缸柴油机 EGR率 喷油提前角 燃油消耗率 NOx |
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| The Simulation Research of EGR on Marine Diesel Engine |
| Hu Bizhu,Wang Feng,Zhang Chongrui,Zhang Dongming,Ping Tao |
| Shanghai Marine Diesel Engine Research Institute, Shanghai 201108;Shanghai University of Finance and Economics, Shanghai 200433 |
| Abstract:The simulation research of EGR’s effects on performance and emission characteristics were investigated on a medium speed single-cylinder marine diesel engine, and to verify the simulation results, experiments were carried out. Simulation results showed that with the use of EGR, NOx weighted emission decreased to 1.94(g(kWh)-1), but on the other hand, the weighted brake specific fuel consumption(BSFC)increased to 9.93(g(kWh)-1). By advancing the injection timing combined with increasing EGR ratio, the weighted BSFC decreased to 4.36(g(kWh)-1)though NOx weighted emission increased to 2.09(g(kWh)-1), which means the fuel economy of diesel engine were optimized obviously. Compared to the experimental results, it shows that the DI-jet combustion model which has been calibrated gives enough calculation precision to predict the performance and emission of the diesel engine. |
| Key words: medium speed single-cylinder marine diesel engine EGR ratio fuel supply advance angle specific fuel consumption NOx〖FL |
