基于流固耦合的防爆柴油机排气歧管的优化改进  

Optimization and Improvement of Explosion-proof Diesel Exhaust Manifold Based on Fluid-structure Coupling

作　　者：孟杰[1] 郭嘉璇 韩斌慧[2] 张建广 MENG Jie;GUO Jiaxuan;HAN Binhui;ZHANG Jianguang(School of Vehicle and Traffic Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China;College of Automotive Engineering,Xi’an Aeronautical Polytechnic Institute,Xi’an 710089,China)

机构地区：[1]太原科技大学车辆与交通工程学院,山西太原030024 [2]西安航空职业技术学院汽车工程学院,陕西西安710089

出　　处：《机械工程与自动化》2025年第1期95-97,100,共4页Mechanical Engineering & Automation

摘　　要：以进行了防爆改造的康明斯某六缸柴油机为研究对象,对其排气歧管内烟气的流动过程以及流固耦合的传热过程进行了模拟分析,得到了相应的速度分布云图、温度分布云图等;通过分析发现原排气歧管出口处流动均匀性指数为0.60,整体的流动均匀性较差,在冷却水的作用下烟气表面温度降低,满足防爆要求。在此基础上提出了改进方案,改进后歧管内烟气出口处的流动均匀性指数提高了0.28,显著提高了烟气整体的流动均匀性,改进后烟气表面平均温度有所下降,既满足了防爆要求又提高了防爆柴油机的整体性能。In this paper,a Cummins six-cylinder diesel engine with explosion-proof modification is used as the object of study,the flow process of flue gas in its exhaust manifold and the fluid-structure coupling heat transfer process were simulated and analyzed,and the corresponding velocity distribution cloud map and temperature distribution cloud map were obtained.Through analysis,it was found that the flow uniformity index at the outlet of the original exhaust manifold was 0.60,and the overall flow uniformity was poor.Under the action of cooling water,the surface temperature of flue gas is reduced to meet the requirements of explosion-proof.On this basis,an improved scheme is proposed.The flow uniformity index at the flue gas outlet in the improved manifold is increased by 0.28,which significantly improves the flow uniformity of the whole flue gas,and the average surface temperature of the flue gas decreases after the improvement,which not only meets the requirements of explosion-proof but also improves the overall performance of the explosion-proof diesel engine.

关 键 词：防爆柴油机 排气歧管 流场分析 流固耦合传热 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术] TD403[自动化与计算机技术—计算机科学与技术]