关键词: 进气歧管；流场仿真；流通性；均匀性；结构优化

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