智能废气再循环系统的流场模拟与优化  

Simulation and optimization of the intelligent control by exhaust recycling system

作　　者：辛佳磊 李孝连 邵澍晖 XIN Jialei;LI Xiaolian;SHAO Shuhui(China Shipbuilding Power Engineering Institute Co.,Ltd.,Shanghai 201208,China;Shanghai Engineering Research Center of Ocean Power,Shanghai 201208,China)

机构地区：[1]中船动力研究院有限公司,上海201208 [2]上海海洋动力工程技术研究中心,上海201208

出　　处：《柴油机设计与制造》2022年第2期6-12,共7页Design and Manufacture of Diesel Engine

摘　　要：采用计算流体力学(CFD)软件STAR⁃CCM+对某双燃料低速发动机的智能废气再循环系统(iCER)的内部流场进行数值模拟,分析系统的压力损失、流动均匀性等流场特性,并依此提出使用锥形管替换原转接处的优化方案。结果表明,原iCER系统的排气集管与出口管路的转接处由于气流急速偏转导致静压损失和总压损失较大,优化后流场静压损失和总压损失均明显降低,出口法向速度均匀性提升了约2%,出口平均质量流量偏差减小了70.9%。该优化方案能有效改善iCER系统的气动性能,有利于提升主机性能。The computational fluid dynamics(CFD)software STAR⁃CCM+was used to simulate the flow field of the intelligent control by exhaust recycling(iCER)system for a dualfuel low⁃speed marine engine.The pressure loss and flow uniformity were analyzed,and a optimization scheme of replacing the o⁃riginal connector by conical tube was proposed.Results show that large static pressure loss and total pressure loss exist at the connector between the exhaust manifold and outlet piping of the iCER system due to the high⁃speed flow deflection.The static pressure loss and total pressure loss of the flow field with the optimized structure are significantly reduced.The normal velocity uniformity of the outlet is increased by about 2%,and the average mass flow deviation of the outlet is reduced by 70.9%.The optimization scenario can effectively improve the aerodynamic performance of iCER system and improve the engine host performance.

关 键 词：废气再循环 双燃料 低速发动机 数值模拟 

分 类 号：U664.1[交通运输工程—船舶及航道工程] X736.3[交通运输工程—船舶与海洋工程]