应用直接耦合法模拟计算气缸盖、机体温度场

Numerical Simulation of Temperature Field of Cylinder Head and Cylinder Block Using Directly Coupled Calculation

使用CFD软件建立了气缸盖、机体和冷却水套组成的耦合模型,采用直接耦合法计算了某3缸汽油机气缸盖、机体温度场。计算结果显示:气缸盖最高温度为223.8℃;气缸盖各缸燃烧室壁面温度分布不同,其中第3缸燃烧室壁面温度较低;机体最高温度为283.8℃,出现在第2缸、第3缸之间的连接处。且计算值与测量值吻合较好,最大误差为7.64%,这反映了直接耦合法在气缸盖、机体温度场数值模拟中有足够的精度。

Directly coupled simulation was employed to investigate the temperature fields of cylinder head and cylinder block of a three cylinder gasoline engine by using CFD software. The computational model included cylinder head, cylinder block and water jacket. The calculating result shows that the highest temperature of cylinder head is 223.8 ℃, the wall temperature distribution of each combustion chamber on the cylinder head is different and the low- est wall temperature occurs in third cylinder, the highest temperature of cylinder block is 283.8 ℃ ,which occurs at the block bridge region between second cylinder and third cylinder. The calculating results were well in agreement with the measured values, and max error was 7.64%. It is shown that the directly coupled calculation can predict the temperature field of cylinder head and cylinder block with sufficient accuracy.