船用柴油机涡轮辅助EGR系统多参数优化匹配研究  

Multi-Parameter Optimization of Marine Diesel Engine Turbo-Assisted EGR System

作　　者：王广夫 祝彦兵 张子悦 张琨 汤旭阳 石磊[4] WANG Guangfu;ZHU Yanbing;ZHANG Ziyue;ZHANG Kun;TANG Xuyang;SHI Lei(First Military Representative Office of Shenyang Bureau in Dalian Area of the Naval Equipment Department,Dalian 116001,Liaoning,China;Shanghai Marine Equipment Research Institute,Shanghai 200031,China;Shanghai CSIS Marine Propulsion Equipment Co.,Ltd.,Shanghai 200031,China;Key Laboratory for Power Machinery and Engineering of Ministry of Education,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]海装沈阳局驻大连地区第一军事代表室,辽宁大连116001 [2]上海船舶设备研究所,上海200031 [3]上海中船重工船舶推进设备有限公司,上海200031 [4]上海交通大学动力机械及工程教育部重点实验室,上海200240

出　　处：《船舶工程》2024年第2期64-72,共9页Ship Engineering

基　　金：国家自然科学基金(51576129)。

摘　　要：为获得柴油机、排气再循环(EGR)系统和涡轮增压系统的耦合优化匹配运行规律,以SC7H两级增压柴油机为研究对象,在GT-Power软件中搭建并校核原机一维模型,并进一步建立了涡轮辅助EGR两级增压柴油机一维模型。针对涡轮辅助EGR与两级增压耦合系统的匹配问题,提出了基于过量空气系数λ和EGR率需求的三步骤匹配计算流程。匹配规律显示:高/EGR涡轮匹配流量比和高/低压级压比比基本呈线性关系,涡轮辅助EGR进排气压差随压比比增大先增加后减小,在压比比为1附近取最优,比高压EGR高35.35 kPa,涡轮辅助EGR具有更优的泵气过程。建立全连接神经网络优化代理模型并采用NSGAⅡ算法开展耦合系统多参数多目标优化研究。结果显示:涡轮辅助EGR具有更优的BSFC和NOx排放效果,在TierⅢ的加权NOx排放限值条件下,涡轮辅助EGR可调两级增压系统的全负荷加权油耗比传统高压EGR可调两级增压系统低5.20 g/(kW·h)。To determine the matching law of coupled optimization of diesel engine,exhaust gas recirculation(EGR)system and turbocharging system,a one-dimensional(1-D)model based on two-stage turbocharged SC7H diesel engine is built and verified in GT-Power,and the 1-D model of the turbo-assisted EGR(TA EGR)coupled two-stage turbocharged diesel engine is reconstructed.A three-step matching framework based on the demand ofλand EGR rate is proposed to address the matching problem of TA EGR coupled two-stage turbocharging system.The matching law shows that,the high-pressure/EGR turbine mass flow ratio and the high-pressure/low-pressure stage pressure ratio are linear basically.The inlet and outlet pressure difference of the TA EGR increases and then decreases with increasing pressure ratio,taking the optimum around the pressure ratio of 1,which is 35.35 kPa higher than the high-pressure EGR.The TA EGR has a better pumping process than the high-pressure EGR.The NSGAⅡalgorithm is used to perform the multi-parameter multi-objective optimal matching study of the coupled system through the fully connected neural network as the agent model of the 1-D model.The optimized matching results show that TA EGR has a better BSFC-NOx emissions.The TA EGR has a better fuel economy with 5.20 g/(kW·h)lower than the HP EGR at the TierⅢweighted NOx emission limits.

关 键 词：柴油机 废气再循环 两级增压 匹配方法 油耗与排放 

分 类 号：TK412.3[动力工程及工程热物理—动力机械及工程]