摘要
基于计算流体动力学(CFD)方法对冷却水套流场特性进行数值模拟,对各缸孔速度流线图及水套内部关键截面的流速分布进行分析,得出缸孔布局及冷却液流速分布规律。流向缸头上鼻梁区(或火花塞侧区)的缸孔面积应最大,流向缸头排气侧下鼻梁区的缸孔面积次之,流向缸头进气侧鼻梁区的缸孔面积最小,同时对于多缸机,各缸间衔接处可布置缸孔,改善缸间区域的冷却。缸头水套上鼻梁区冷却液流速应在1.5 m/s以上,下鼻梁区流速需控制在1.0 m/s及以上;缸体水套整体区域冷却液流速应大于0.5 m/s。基于冷却液流动路径分析获得的缸孔布局及冷却液流速分布规律应用于单缸发动机和双缸发动机水套流场评估及结构改进中,通过缸孔调整,单缸发动机和双缸发动机冷却水套流场得到明显改善,缸头水套鼻梁区冷却液流速及缸体水套冷却液流速满足流速分布规律。水套改进后发动机火花塞垫片温度明显降低。
Based on computational fluid dynamics(CFD)method,the flow field characteristics of cooling water jacket were numerically simulated,the velocity streamline distributions of each cylinder hole and the coolant velocity distribution in key sections inside water jacket were analyzed,and the cylinder hole layout and the distribution law of coolant velocity were obtained.The cylinder hole area flowing to the upper nose bridge area(or spark plug side area)of the cylinder head shall bebe the largest,the cylinder hole area flowing to the lower nose bridge area on the exhaust side of the cylinder head shall be the second,and the cylinder hole area flowing to the nose bridge area on the intake side of the cylinder head shall be the smallest.At the same time,for multi-cylinder engines,cylinder holes can be arranged at the connection between cylinders to improve the cooling of the area between cylinders.The coolant velocity in the upper nose area of cylinder head water jacket shall be more than 1.5 m/s,and the coolant velocity in the lower nose area shall be controlled at 1.0 m/s or more.The coolant velocity in the whole area of the cylinder block water jacket shall be greater than 0.5 m/s.The cylinder hole layout and the distribution law of coolant velocity obtained based on the analysis of coolant flow path are applied to the evaluation and structural improvement of water jacket flow field of single cylinder engine and two-cylinder engine.Through the adjustment of cylinder holes,the flow field of cooling water jacket of single cylinder engine and two-cylinder engine is significantly improved,and the coolant velocity in the nose area of cylinder head water jacket and the coolant velocity of cylinder body water jacket meet the distribution law of coolant velocity.After the improvement of water jacket,the temperature of engine spark plug gasket decreases significantly.
作者
谭礼斌
袁越锦
黄灿
TAN Libin;YUAN Yuejin;HUANG Can(School of Mechanical and Electrical Engineering,ShaanXi University of Science&Technology,Xi'an 710021,China;Research and Development Center,Loncin Motor Co.ltd,Chongqing 400039,China)
出处
《成都工业学院学报》
2023年第3期22-30,共9页
Journal of Chengdu Technological University
基金
国家自然科学基金项目(51876109)。
关键词
冷却水套
流速分布
计算流体力学
火花塞垫片温度
cooling water jacket
velocity distribution
computational fluid dynamics
spark plug gasket temperat
