农业工程学报2012，Vol.28Issue(10)：70-77,后插1-后插2,10.DOI:10.3969/j.issn.1002-6819.2012.10.012
2D25卧式柴油机冷却水套结构的CFD模拟优化
CFD simulation and optimization of cooling water jacket structure for 2D25 horizontal diesel engine
摘要
Abstract
In order to fulfill the technical requirements of a high-efficiency low-emissions off-road horizontal diesel engine and design a rational cooling system, combined with the cooling water flow test, a numerical simulation model of the coolant flow was built by using three-dimensional Computational Fluid Dynamics (CFD) simulation method and was verified by the comparison between the measurement data and the CFD simulation data. The impact of cooling water jacket structure on coolant flow field in 2D25 horizontal diesel engine with a forced-cooling closed-loop cooling system, and the cooling water jacket structure was finally optimized. The results indicated that the rational design of the water inlet holes in the cylinder block can improve the coolant flow characteristics and cooling effect in the water jacket, reduce the flow losses and the water pump power loss. Rational design of the water inlet holes in the cylinder head can greatly increase the overall coolant flow velocity in the cylinder head water jacket, reduce cylinder-to-cylinder variation in cooling, improve the cooling in the critical valve bridge area in the cylinder head to sustain high thermal loading, and enhance the effectiveness of cooling at the exhaust port side. After optimization, the overall spatial average velocity and the overall spatial average heat transfer coefficient of the coolant in the water jacket increased by 40% and 41.7% respectively compared to the original design. There are no large vortices any more in the shared water chamber and the upper region of each cylinder water jacket. The flow velocity and heat transfer in the critical valve bridge area in the cylinder head were significantly enhanced, and the uniformity of cylinder-to-cylinder was improved.关键词
柴油机/优化/设计/冷却水套/流动特性/流场Key words
diesel engines/ optimization/ design/ cooling water jacket/ flow characteristics/ floe field分类
能源科技引用本文复制引用
雷基林,申立中,毕玉华,贾德文,陈志娥..2D25卧式柴油机冷却水套结构的CFD模拟优化[J].农业工程学报,2012,28(10):70-77,后插1-后插2,10.基金项目
云南省科技创新强省计划项目(2008AD007) （2008AD007）
云南省应用基础研究基金资助项目(2009ZC036M) （2009ZC036M）
