Flow analysis of engine intake manifold based on computational fluid dynamics

Intake manifold is a part of intake system, which has an important impact on intake uniformity of the multi-cylinder engine. Three kinds of intake manifold are designed and a three-dimensional flow field numerical simulation for them is conducted using software FLUENT. The flow characteristics of intake manifold are analyzed and the intake unevenness of intake manifold is calculated. According to the flow field contours, the reason of generating non-uniformity of intake system is analyzed. The results show that the inlet end arranged in the middle of the intake manifold can reduce the non-uniformity of intake system. And it can improve the engine intake and combustion quality. The calculation results provide a theoretical basis for designing the complex intake manifold