第40卷(2018)第1期性能与排放
柴油机 Diesel Engine
Vol.40(2018) No. 1
基于EGR技术的船用低速二冲程柴油机
增压系统匹配研究孙坤，朱思鹏，陆振华，邓康耀
（上海交通大学动力机械与工程教育部重点实验室，上海200240）
要：针对采用ECR技术的船用低速二冲程荣油机在满足IMO排放法规时增压系统须兼顾多摘
模式、宽流量范图运行的问题，基于某型低速二冲程柴油机在GT-Power软件中搭建整机及ECR系统仿真模型并校核。在此基础上研究涡轮增压器匹配、进排气旁通、废气旁通（ECB)等措施对该型柴油机TierⅢ和TierIⅡI模式时性能的影响并得出系统匹配策略。研究结果表明：TierⅢ模式时，减小涡轮等效流通面积可有效恢复增压压力，但导致运行点接近压气机喘振线；引入进排气旁通则可有效解决喘振问题。TierII模式时，采用ECR和ECB措施均可有效解决因涡轮等效面积减小带来的增压压力过高问题，但其中ECR方案NO,排放较低，燃油消耗率偏高，而ECB方案燃油消耗率较低，NO，排放偏高综合应用EGR和ECB，即高负荷采用EGR，中低负荷采用ECB的匹配方
案，可达到整机NO，排放满足TierⅡI法规要求且燃油消耗率最低的设计目标。关键词：船用低速二冲程柴油机；增压系统ECR；EGB；匹配
中图分类号：TK423.5
文献标识码：A
文章编号：1001-4357(2018)010001-07
ResearchonTurbochargingSystemsMatchingwithMarine
Low-Speed Two-Stroke Diesel Engines Using EGR
Sun Kun,Zhu Sipeng,Lu Zhenhua,Deng Kangyao
(Key Laboratory for Power Machinery & Engineering of Ministry of Education，
Shanghai Jiao Tong University，Shanghai 200240)
Abstract: To meet with IMO emissions regulations, the matching of turbocharging systems with marine low-speed two-stroke diesel engines using exhaust gas recirculation (ECR) technology should take the is-sues of multi-mode, wide flow range operation into consideration, An engine simulation model with the ECR system was established and calibrated with GT-Power software based on a type of low-speed two stroke diesel engine. Effects of the turbocharger matching, intake and exhaust bypass, exhaust gas bypass on the engine performance under Tier IIl and Tier II restrictions were analyzed and the turbocharger matching strategies were obtained. Results show that in the Tier IIl mode, reducing turbine equivalent ar ea can effectively restore the boost pressure, however the operating points are close to the compressor sur ging line; the introduction of intake and exhaust bypass can effectively solve the surging problem. In the Tier II mode, the ECR and EGB schemes can effectively solve the high charging pressure caused by the decreased turbine equivalent area. The comparison results show that NO, emissions are low and BSFC is high in the EGR scheme; BSFC is low and the NO, emissions are high in the EGB scheme. To achieve the optimized fuel economy under the Tier II NO, restrictions, the EGR and EGB strategy should be ap plied comprehensively, which means the ECR strategy should be adopted at high loads and the EGB strat egy applied at medium to low loads.
Key words: marine low-speed two-stroke diesel engine; turbocharging system; EGR; EGB; matching 收稿日期：2017-05-03
作者简介：孙坤（1991-），男，硕士研究生，主要研究方向为内燃机增压技术，E-mail：sksjtu@163.com。