计算流体力学(简称CFD)作为一种有效的设计工具正在汽车产品的研究和开发中得到应用。根据计算对象,作者运用两种CFD方法:一种是运用被广泛使用的数学紊流模型的CFD方法;另一种是不用紊流模型而用有限差分法来解Navier—Stokes的方法。但后一方法与前一方法相比计算时间很长。作为计算实例,本文给出了油嘴喷孔中流动特性的计算研究结果。 Computational fluid dynamics (CFD) is being used as an effective design tool in the research and development of automotive products. According to the calculation object, the author uses two kinds of CFD methods: one is the CFD method using the widely used mathematical turbulence model; the other is the Navier-Stokes method using the finite difference method without the turbulence model. However, the latter method has a long calculation time compared with the previous method. As a calculation example, this paper gives the calculation results of the flow characteristics in the nozzle orifice.