某重型发动机排气歧管的流场分析与优化设计  

Flow field analysis and optimization design of a heavy-duty engine exhaust manifold

作　　者：刘伟[1] 张勇[1,2] 闫立鹏 赵广平 苏琦[5] LIU Wei;ZHANG Yong;YAN Lipeng;ZHAO Guangping;SU Qi(School of Mechanical Science and Technology,Northeast Petroleum University,Daqing,Heilongjiang 163318,China;Heilongjiang Key Laboratory of Petroleum and Petrochemical Multiphase Treatment and Pollution Prevention,Daqing,Heilongjiang 163318,China;Research Institute of Petroleum Engineering,SINOPEC,Beijing 100101,China;Downhole Services Branch of Daqing Oilfield Company Limited,Daqing,Heilongjiang 163453,China;Device Department of Daqing Refining and Chemical Company,PetroChina,Daqing,Heilongjiang 163411,China)

机构地区：[1]东北石油大学机械科学与工程学院,黑龙江大庆163318 [2]黑龙江省石油石化多相介质处理及污染防治重点实验室,黑龙江大庆163318 [3]中国石化石油工程技术研究院,北京100101 [4]大庆油田有限责任公司井下作业分公司,黑龙江大庆163453 [5]中国石油大庆炼化分公司机动设备处,黑龙江大庆163411

出　　处：《东北石油大学学报》2019年第5期110-118,I0008,共10页Journal of Northeast Petroleum University

摘　　要：发动机排气歧管的内部流场流动均匀性是影响排气歧管换热性能的重要因素。基于计算流体动力学分析,采用RNG k-ε湍流模型,进行发动机排气歧管内部流场的流动均匀程度数值分析;采用响应曲面优化方法,进行排气歧管的最优结构设计。结果表明:排气歧管内部流场的流动均匀程度主要受支管1、3、4弯曲部位的结构影响,优化后的排气歧管流动均匀性满足要求,流动均匀指数较优化前提升6.1%。减小排气歧管支管1、4的内外弯曲半径和增加支管3的弯曲内半径有利于提升流动均匀指数。该结果可为某重型发动机的结构优化设计提供指导。The internal flow field uniformity of the engine exhaust manifold is an important factor affecting the heat transfer performance of the exhaust manifold.Based on computational fluid dynamics(CFD),the RNG k-εturbulence model is used to numerically analyze the flow uniformity inside the engine exhaust manifold,and the response surface optimization method is used to optimize the exhaust manifold and to instruct structural design.The results show that the flow uniformity of the exhaust manifold is mainly affected by the structure of bending parts of 1,3 and 4 branches.Optimized flow uniformity of exhaust manifold meets the inspection index,and the flow uniformity index is increased by 6.1%compared with that before optimization.Reducing the inner and outer bending radii of the exhaust manifold branches 1 and 4 helps to increase the flow uniformity index,and increasing the curved inner radius of the branch pipe 3 helps to increase the flow uniformity index.This result provides guidance for structural optimization design of heavy-duty engines.

关 键 词：排气歧管 流场分析 响应曲面优化 结构设计 流动均匀指数 重型发动机 

分 类 号：U463[机械工程—车辆工程]