天然气发动机水套结构的优化分析  

Optimization analysis on water jacket structure of natural gas engine

作　　者：魏威[1] 吕锋[1] 曾丽丽[1] 叶洁[1] 张小姣[1] 谢夏琳[1] WEI Wei;LYU Feng;ZENG Lili;YE Jie;ZHANG Xiaojiao;XIE Xialin(Guangxi Yuchai Machinery Co.,Ltd.,Yulin 537005,Guangxi,China)

机构地区：[1]广西玉柴机器股份有限公司,广西玉林537005

出　　处：《柴油机设计与制造》2022年第2期31-35,共5页Design and Manufacture of Diesel Engine

摘　　要：为降低某款天然气发动机的缸盖底板开裂风险,采用计算流体动力学(CFD)⁃有限元分析(FEA)流固耦合方法,通过CFD计算提供的水套侧和气体侧的热边界构建FEA模型,并由FEA模型计算分析缸盖温度场、热应力和低周疲劳寿命。计算结果表明,与原模型方案相比,通过缸盖水套结构的优化,优化后的新模型方案能显著提高缸盖鼻梁区水套底部的流速和对流换热系数,降低缸盖温度和热应力,增加缸盖低周疲劳寿命,提升缸盖的可靠性。试验验证表明,新模型方案能显著降低缸盖底板的最高温度。In order to reduce the cracking risk of the cylinder head fire deck of a natural gas engine,the Computational Fluid Dynamics(CFD)⁃Finite Element Analysis(FEA)coupling method was used.The CFD simulation provided the thermal boundary of the water side and the gas side to the FEA model,and the temperature field,thermal stress and low cycle fatigue life of cylinder head were obtained by FEA simulation.The simulation results show that compared with the original proposal,the new proposal can significantly increase the velocity and convective heat transfer coefficient in the bottom of the bridge areas of cylinder head water jacket,reduce the temperature and thermal stress of cylinder head,improve the low cycle fatigue life of cylinder head,then improve the reliability of the cylinder head.The temperature field test of cylinder head has proved that the new proposal can significantly reduce the maximum temperature of cylinder head fire deck.

关 键 词：天然气发动机 水套结构 对流换热系数 低周疲劳寿命 

分 类 号：TK433[动力工程及工程热物理—动力机械及工程]