摘要
对某双缸发动机冷却水套内部冷却液流动及其传热特性进行了数值模拟,对冷却水套排气侧及鼻梁区等高温区域的冷却液流动均匀性及流速进行了分析评估.结果表明,该冷却水套左缸鼻梁区流动分布较差.冷却水套结构改进后左右两缸流动均匀性得到改善.利用共轭传热分析方法搭建了冷却水套和发动机固体间的流固耦合模型,同时考虑了沸腾传热的影响.结果表明考虑沸腾传热的发动机固体最高温度与不考虑沸腾传热的温度结果低6℃,高温区域局部沸腾传热可有效强化该区域的换热,从而降低发动机缸头的高热负荷.
The coolant flow and heat transfer characteristics in the cooling water jacket of a two cylinder engine are numerically simulated,and the coolant flow uniformity and flow velocity in the high-temperature areas such as the exhaust side of the cooling water jacket and the nose bridge area are analyzed and evaluated.The results show that the flow distribution in the nose area of the left cylinder of the cooling water jacket is poor.After the cooling water jacket structure is improved,the flow uniformity of the left and right cylinders is improved.The fluid solid coupling model between cooling water jacket and motor solid is established by using conjugate heat transfer analysis method,and the influence of boiling heat transfer is considered.The results show that the maximum solid temperature of the engine considering boiling heat transfer is 6℃lower than that without boiling heat transfer,and local boiling heat transfer of high temperature region can effectively strengthen its heat transfer characteristics,so as to reduce the high heat load of the engine cylinder head.
作者
谭礼斌
袁越锦
徐英英
袁月定
TAN Li-bin;YUAN Yue-jin;XU Ying-ying;YUAN Yue-ding(College of Mechanical and Electrical Engineering, Shaanxi University of Science & Technology, Xi′an 710021, China;School of Mathematics and Statistics, Hunan University of Finance and Economics, Changsha 410205, China)
出处
《陕西科技大学学报》
北大核心
2022年第4期142-149,共8页
Journal of Shaanxi University of Science & Technology
基金
国家自然科学基金项目(51876109)。
关键词
发动机
冷却水套
结构改进
共轭传热
沸腾传热
engine
cooling water jacket
structural improvement
conjugate heat transfer
boiling heat transfer
