Abstract: The most important form of energy loss in long distance gas pipelines is turbulence resistance. In order to study the rib shape on the turbulent situation through the rib of the influence law of fluid medium, this paper uses the CFD software of triangular rib and the blade shape rib between two kinds of typical ribs large eddy simulation under Reynolds number of 5 300, the wall resistance and flow field are analyzed to obtain the shape of the rib with better drag reduction effect, and to find out the reasons why the different shape ribs affect the flow field. The results show that the blade shape ribs have smaller wall resistance and smaller velocity gradient near the wall than the spaced triangular ribs. The secondary vortices generated make the flow field more stable and have better drag reduction effect.

Key words: Rib drag reduction, Large eddy simulation, The secondary vortex

摘要： 在长距离输气管道中最主要的能量损失形式是湍流阻力。为了研究肋条形状对湍流情况下流过肋条的流体介质的影响规律，采用CFD软件，在雷诺数为5 300的条件下，对间隔三角形肋条和刀刃形肋条两种典型肋条进行大涡模拟，通过分析壁面阻力和流场，得出减阻效果更好的肋条形状，并找出不同形状肋条影响流场的原因。结果表明，与间隔三角形肋条相比，刀刃形肋条受到的壁面阻力更小，近壁区速度梯度更小，产生的二次涡使流场更加稳定，具有更好的减阻效果。

关键词: 肋条减阻, 大涡模拟, 二次涡