高压共轨柴油机缸盖-冷却水耦合传热研究  

Study on Coupled Heat Transfer of Cylinder Head-Cooling Water of High Pressure Common Rail Diesel Engine

作　　者：王东方 雷基林[1] 王雅涵 

机构地区：[1]昆明理工大学云南省内燃机重点实验室,云南省昆明市650500

出　　处：《农业装备与车辆工程》2018年第3期1-5,共5页Agricultural Equipment & Vehicle Engineering

基　　金：国家自然科学基金资助项目(编号51366006和51665021)

摘　　要：采用试验测试与数值仿真相结合的方法,以一款国IV非道路柴油机为研究对象,基于顺序耦合思想建立了缸盖-冷却水流固耦合传热模型,研究了缸盖的温度场、热应力和热应变的分布规律。研究结果表明:将缸盖和冷却水作为一个耦合系统进行流固耦合传热研究,能够将难以确定的外边界条件转换成内边界条件,从而更好地模拟内燃机工作循环过程中缸盖的传热状态,使仿真结果与试验结果误差更小,在5%以内。从数值仿真分析发现,冷却水高温区域主要集中在鼻梁区以及排气侧部分狭窄区域;缸盖的4个鼻梁处温度较高,并在鼻梁处出现应力集中现象,最高温度和最大应力均出现在第4缸鼻梁处;缸盖在排气侧周边的变形较大,最大变形在EGR冷却水入口处的尖角位置。By adopting the combination of experimental test and numerical simulation analysis method, taking non-road high pressure common rail four-cylinder diesel engine as research target, the temperature field, thermal stress and thermal strain distribution of cylinder head are studied based on the idea of sequential coupling, a fluid-solid coupling heat transfer model of cylinder head - cooling water is established. The result shows that the study of fluid-solid coupling heat transfer between the cylinder head and the cooling water as a coupling system can convert the difficult boundary condition to inner boundary condition, so as to better simulate the heat transfer state of the cylinder head during the working cycle of the internal combustion engine. The error between simulation results and test results is less, within 5%. It’s found from the numerical simulation analysis, the high temperature region of cooling water is mainly concentrated in the nose area and the narrow area of the exhaust side. The temperature of the four bridge zones of the head is higher and the stress concentration occurs at the bridge of the nose. The maximum temperature and the maximum stress are in the fourth bridge zone. The deformation of the cylinder head on the exhaust side is large, and the maximum deformation is at the sharp angular position at the EGR cooling water inlet.

关 键 词：柴油机 耦合传热 温度场 热负荷 热应变 

分 类 号：TK422[动力工程及工程热物理—动力机械及工程]