Abstract: The flow and uniformity of intake manifold have important influence on engine power performance and economy. The intake manifold of a 1.5 T gasoline engine is researched by using AVL-FIRE analysis software. Then the structure of the intake manifold is optimized according to the analysis results. The improved intake manifold model is simulated and analyzed until the intake flow rate and intake uniformity of each branch of the intake manifold are improved and the evaluation index is satisfied. Finally, a sample is made according to the optimized intake manifold. The correctness of the simulation analysis is verified by experiments on a steady flow test bench. Through the combination of simulation analysis and test verification, the paper summarizes the optimization direction of the intake manifold, which effectively shorts the development cycle of the intake manifold.

Key words: Intake manifold; Flow field simulation; Liquidity; Uniformity; Structure optimization

摘要： 进气歧管流通性和均匀性对发动机动力性和经济性有重要影响。利用 AVL-FIRE 分析 软件对某款 1.5 T 汽油机进气歧管进行进气流通性和均匀性研究，根据分析结果对进气歧管的 结构进行优化设计，对改进后的进气歧管模型进行仿真分析，直至进气歧管各支管的进气流 量和进气均匀性得到改善，满足评价指标。最后根据优化后的进气歧管模型制作快速样件， 在稳流试验台上进行试验，验证仿真分析的正确性。文章通过仿真分析结合试验验证的方式， 总结出了进气歧管的优化方向，有效缩短了进气歧管的开发周期。

关键词: 进气歧管；流场仿真；流通性；均匀性；结构优化