进气道螺旋段结构参数对流动特性影响的研究

Study on Effects of Structure Parameters of Intake Port Helical Section on Flow Characteristics

用CFD软件进行了柴油机螺旋进气道流动特性的三维数值模拟;利用气道稳流试验台验证了模拟计算的准确性,分析了螺旋段的结构参数对流场特性的影响。研究发现:由于螺旋气道结构的复杂性,螺旋段结构参数对气道性能的影响十分复杂,其中,影响较敏感的结构参数为过渡圆半径、蜗壳半径和气门凸台高度。

Three-dimension numerical simulation of flow characteristics of helical intake port was carried out. The CFD numerical simulation method, verified by steady flow test rig, was used to analyze the effects of the helical section structure parameters of intake port on the intake flow characteristics. The re- sults indicate that the helical intake port possesses complex structure, the flow characteristics are affected by many structure parameters of its helical section. Among them, radiuses of transition part and swirl shell, valve guide boss height are the most sensitive parameters.