天然气管道肋条减阻数值分析

随着清洁能源的广泛应用，提高输气管道的输送效率成为热点问题，其中降低管输过程中的摩擦阻力至关重要。为探究三角形肋条在输气管道减阻中的应用效果，利用ANSYS-FLUENT软件对光滑管道和肋条管道中的湍流流动进行了数值模拟。结果表明，在近壁区域，肋条管道与光滑管道的速度剖面相差较大，主流区域相差较小，肋条结构的减阻效果主要基于近壁面；肋条结构将漩涡推离壁面，使肋底充满低速流体，降低近壁面处动量交换，减小摩擦阻力；与光滑壁面相比，尺寸为s=h=0.516 5 mm的肋条具有4.38%的减阻效果。

Numerical Analysis of Drag Reduction of Riblet in Gas Pipeline

With the wide application of clean energy, improving the transportation efficiency of gas pipeline has become a hot issue, among which, it is very important to reduce the friction resistance in the pipeline transportation process. In order to explore the application effect of triangular riblet in the drag reduction of gas pipeline, ANSYS?FLUENT software was used to numerically simulate the turbulent flow in smooth pipeline and riblet pipeline. The results show that: in the near wall area, the velocity profile of ribbed pipe and smooth pipe has a big difference, and the difference is small in the mainstream area. The drag reduction effect of riblet structure is mainly based on the near?wall surface. The riblet structure pushes the vortex away from the wall surface, filling the rib bottom with low?speed fluid, reducing momentum exchange near the wall surface and friction resistance. Compared with the smooth wall surface, the riblet structure with the size of s＝h＝0.516 5 mm has a drag reduction effect of 4.38%.