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何赛1，张琨1，崔毅1，邓康耀1，罗爱强2，开进彬3，宋义忠3
1.上海交通大学；2. 广州柴油机厂股份有限公司;3.泛亚汽车技术中心有限公司
摘要：针对直列8缸船用柴油机高负荷排气温差较高的问题，分析了直列8缸柴油机高负荷排气温差较高的原因，研究了混合式脉冲转换（MIXPC）增压系统降低最大排气温差的主要途径，设计了一种混合模件排气（Hybrid Modular Exhaust）系统，探讨了HME、MIXPC和多功能脉冲转换器（MMPC）三种不同排气系统的性能。结果表明：MMPC系统高负荷排气温差较高的主要原因是上游压力波动影响下游扫气过程；MIXPC系统通过增加第7缸支管出口与第8缸支管出口面积比，可以降低最大排气温差，改善发动机排温不均匀性；采用HME增压系统可以有效降低扫气干扰，在改动较小以及不改变整机性能的前提下，最大排气温差降低29°C，排气温度不均匀性得到明显改善。
关键词：柴油机；混合模件排气系统；扫气干扰；仿真；性能
Abstract：The exhaust temperature difference of the inline 8-cylinder marine diesel engine is very high. In this paper, the reason on this phenomenon was analyzed, and the main way that uses mixed pulse conversion (MIXPC) exhaust system to reduce the difference of maximum temperature was studied. Hybrid module exhaust (HME) system has been designed, and the performance of HME, MIXPC and modular multi-pulse converter (MMPC) exhaust system was discussed. The results show that the large exhaust temperature difference of MMPC system under a high load is mainly because the upstream pressure fluctuations affecting the downstream scavenging process. By increasing area ratio of the seventh cylinder manifold outlet and the eighth cylinder manifold outlet, MIXPC system could reduce the maximum exhaust temperature difference and improve engine exhaust temperature inhomogeneity. When a small structure is changed, HME exhaust system could effectively reduce scavenging interference and the overall performance of the engine has not changed. By using HME, the maximum exhaust temperature difference is reduced at 29 ° C, and exhaust temperature inhomogeneity got improved significantly.
Key words：Diesel Engine; HME; Scavenging Interference; Simulation; Performance
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