用椭圆型Ｐｏｉｓｓｏｎ 方程作为控制方程的分形耦合法对形状复杂的柴油机进气道生成三维贴体网格，用时间推进有限容积法求解Ｅｕｌｅｒ方程，对柴油机进气道进行了全三维流动计算．其结果展示了进气道的结构型线对流动的影响，为进气道的设计、改进提供了理论依据． A fractal coupling method based on elliptic Poisson equation was used to generate three-dimensional grids for the complicated inlet of diesel engine. Euler equation was solved by time-limited finite volume method, and the full three-dimensional flow of diesel inlet was calculated. The results show the influence of the structural profile of the inlet on the flow and provide a theoretical basis for the design and improvement of the inlet.