【摘要】 论述了1105柴油机的改进原理,对改进前的花瓣型燃烧室和改进后的盆形燃烧室建立了几何模型并划分动态网格.利用仿真软件STAR-CD对改进前后的1105柴油机的燃烧过程进行三维数值模拟,计算了两种不同燃烧室的缸内气相流场及其燃烧的温度场和压力场,并进行了对比分析.试验结果表明,模拟计算值与实测值基本吻合,改进后的盆形燃烧室的1105柴油机有更好的动力性和燃油经济性.表明在模拟精度达到一定水平时,发动机缸内燃烧过程的三维仿真计算可用来降低产品的研制周期和费用,是一种有效的研究和设计手段.更多还原

【Abstract】 The principle of the improvement about 1105 diesel engine was discussed.The 3D geometric models of the flower shape combustion chamber and bowl shape combustion chamber were established,and the dynamic grid was created.The 3D simulation of combustion process was achieved both on the improved 1105 diesel engine and its original one by using the STAR-CD software.The details of in-cylinder gas fluid,temperature field and pressure field were calculated and compared with each other.The accuracy of numerical simulation was proved by comparing the results of simulation with experiment data.The results showed that the power of the improved diesel engine was increased significantly,and its fuel consumption was decreased.It was proved that the computer simulation with high accuracy was effective and could reduce the cost and shorten the time of product development.更多还原