基于流固耦合模型的柴油机冷却系统优化设计  

Optimization Design of Diesel Engine Cooling System Based on Coupled Fluid-Structure Model

作　　者：谷芳 崔国起[1] 吴华杰[1] 

机构地区：[1]天津大学内燃机研究所,天津300072

出　　处：《汽车工程》2012年第8期675-678,674,共5页Automotive Engineering

基　　金：国家自然科学基金项目(51106106);天津大学自主创新基金(TJU-JFF-08B57)资助

摘　　要：采用CFD方法,建立了由机体和缸盖中的水套组成的柴油机冷却系统的流固耦合传热仿真模型,进行了流体与固体之间的共轭传热仿真。结果表明,机体水套内的流动分布较好,基本满足换热要求;但缸盖水套内的流动分布较差,鼻梁区流速不足0.5m/s,造成缸盖火力面温度偏高。通过增加鼻梁区侧向水道、改进进水口结构等措施,使鼻梁区流速提高到1m/s以上,改善了缸盖的换热状况。A coupled fluid-structure model for the cooling system consisting of the water jackets in cylinder block and cylinder head of diesel engine is established with CFD technique and a simulation on the conjugate heat transfer between fluid and structure is conducted. The results show that the flow distribution in the water jackets of cylinder block is good, basically meeting the requirements of heat transfer, but that in cylinder head is relatively poor with a flow velocity in valve bridge area less than O. 5m/s, leading to a higher temperature on the flame face of cylinder head. By taking some improving measures such as adding side water paths in valve bridge area and modif-ying water inlet and outlet structures, resulting in a higher flow velocity in valve bridge area up to 1m/s, hence the heat transfer in cylinder head is improved.

关 键 词：柴油机 冷却系统 流固耦合 仿真 

分 类 号：TK423[动力工程及工程热物理—动力机械及工程]