关键词: 立管道, 球形内检测器, 流体仿真, 推力计算, 通过性

Abstract: Spherical pipeline’s inner detector can test and locate subtle leakage in a submarine pipeline. In order to establish a more accurate result, the spherical inner detector must go through the submarine pipe’s vertical segment smoothly. Using standard [k-ε] double-equation model and computational fluid dynamics software Fluent, a three-dimensional simulation about the model ball’s flow field is established on the basis of experimental vertical pipe platform. Also, the critical speed when the ball is passing through the vertical segment is calculated. The outcome speed matches well with experimental data, proving the simulation method correct. On the strength of this simulation, the possibility of whether a detector can pass real submarine pipeline or not is predicted, and the influencing factors are analyzed. A conclusion is achieved that the diameter ratio between the ball and the pipe is a significant parameter, which guarantees the spherical inner detector passing the submarine pipe’s vertical segment without barrier under a normal working condition of flow speed [0.8~1.2 m/s], when it is lager than 73 percent.

Key words: vertical pipeline, spherical inner detector, fluid simulation, thrust calculation, passing ability