四气门汽油机进气道流动特性的CFD分析

CFD Analysis of Intake Port Flow Characteristics for Fourvalve Gasoline Engine

摘要:

为提高某四气门汽油机的进气道性能，利用三维流体动力学软件AVLFire，模拟计算其稳流试验台的三维数值.通过对原气道的分析，发现结构不合理之处，并依据实际要求提出了改进方案，然后对新方案进气道重新模拟分析.结果表明，初步改进后的气道在流通特性上有明显的提高.

关键词:汽油机; 进气道; 流量系数; 滚流

Abstract:

To improve the performance of the intake port for some practical fourvalve gasoline engine，the threedimensional numerical simulation of steady air flows was performed with CFD（Computational Fluid Dynamics） software AVLFire.Analysis of the port shows that its figure design is inconsequent and a new design method based upon practical needs was put forward.The improved port proves better in terms of flow Characteristics.

Key words:gasoline engine; intake port; flow coefficient; tumble swirl