| 摘要:以某中速船舶柴油机为研究对象，采用数值模拟与试验研究相结合的方法，完成两级相继增压系统对船舶柴油机性能影响的计算与试验研究，研究结果表明，增压压力、米勒正时、压缩比、喷油正时之间存在可以使柴油机动力性、经济性、排放性同时得到优化提高的匹配关系，且喷油正时对缸内热负荷分布的影响明显。通过采用两级相继增压系统，实现柴油机全工况性能的优化提高。试验结果表明：通过采用两级相继增压技术，适当降低压缩比并使用米勒循环，该柴油机功率提升15%，全工况油耗平均下降3.9 g/（kW·h），增压系统效率达到71.3%，NOx加权排放满足IMO Tier Ⅱ 限值要求。 |
| 关键词: 两级增压 米勒正时 压缩比 喷油正时 |
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| Numerical Simulation and Test of Influence of Two Stage Sequential Turbocharging System for Marine Diesel Engine |
| ZHONG Jie,LI Xiannan,SHEN Gang,WANG Xianfeng,ZHANG Wenzheng,XIA Tian |
| National Key Laboratory of Marine Engine Science and Technology, Shanghai 201108, China;Shanghai Marine Diesel Engine Research Institute, Shanghai 201108, China |
| Abstract:Taking a medium speed diesel engine as the research object，the calculation and test of the influence of two stage sequential turbocharging system for marine diesel engine was carried out by combining simulation analysis with experimental verification.The research results show that：There is a matching relationship between turbocharged pressure，Miller timing，compression ratio and injection timing to optimize engine power，economic performance and emission at the same time；The fuel injection timing has obvious influence on the thermal load distribution in the cylinder.Using two stage sequential turbocharging system，the performance of diesel engine under all loads was optimized.The test results show that by combining two-stage sequential turbocharging system，low compression ratio and Miller technology，the power of the diesel engine is increased by 15%，the average fuel consumption under all loads is reduced by 3.9 g/（kW·h），the efficiency of the two-stage turbocharging system reaches 71.3%，and the NOx weighted emission satisfys the limitation of IMO Tier Ⅱ. |
| Key words: two-stage turbocharging Miller timing compression ratio fuel injection timing |
