摘要
为探明影响柴油机喷雾数值模拟精度的若干因素,采用通用商业软件FLUENT对柴油机喷雾特性进行了CFD模拟计算,分别研究了网格尺寸、喷雾粒子数和最大时间步长对油束几何形状及油束贯穿距的影响.结果表明,网格划分的精度和喷雾粒子数量的多少对计算结果的正确性和油束的几何形状有直接的影响,网格尺寸过大或喷雾粒子数过少则喷雾几何形状失真.最大时间步长对数值模拟的精度在一定的范围内影响是比较小的.
In order to find out the effect factors on the numerical simulation precision of a diesel spray, the diesel spray characteristics are simulated by FLUENT which is a general commercial CFD numerical analysis code. The effects of the grid size, the spray droplet quantity and the maximum time step on spray shape and penetration are investigated respectively. The simulation results show that the precision of computational meshes and the quantity of spray droplet directly influence the correctness of the calculation results and the geometric shape of a spray. The larger grid size or the smaller droplet quantity results in the distortion of the geometric shape of a spray. The maximum time step has a little influence on the numerical simulation precision within a limit time step.
出处
《海军工程大学学报》
CAS
北大核心
2006年第1期108-112,共5页
Journal of Naval University of Engineering
关键词
柴油机
喷雾特性
油柬贯穿距
数值模拟
DPM模型
diesel engine
spray characteristics
spray penetration
numerical simulation
DPM model
