Experimental And Numerical Study On The Submarine Pipelines With Spoiler

As a carrier to deliver oil and gas from offshore platform to land, submarine pipelines have many merits, such as continuously deliver, large conveying capacity, and convenience management and so on, so they have been used extensively in ocean engineering. However because of the severe conditions in marine environment,sediments beneath submarine pipelines will be often carried away by local flow caused by wave and tide, this may made the pipeline be suspended and lose its stability, finally led to break or other accident, and brought about tremendous economic loss and environment pollution.Based on the domestic and overseas study on the problem of scouring near the submarine pipelines, the two-dimensional numerical simulation has been used to research the variety of the velocity field when the submarine pipeline was added a rigid or a flexible spoiler in this paper.A plexiglass tube was used to imitate the submarine pipeline and plexiglass plate as the spoiler fixed at the top of pipeline in the experimental study. The instantaneous speed of seven cross sections near the submarine pipeline, the pressure in 12 points along the surface of the submarine pipeline and the configuration of the scour were obtained by high accuracy instrument ADV and pressures sensors as well as a probe in there situations that were got by changing the spacing ratio e in a flume. The distributing of pressure, velocity, turbulent intension near the pipeline and the scour beneath the pipeline were analyzed when added a spoiler. Compared the study on rigid spoiler with that on flexible one, a primary research result on it has been worked out and the scour beneath the pipeline was analyzed.The research on the problem of scouring near the submarine pipelines has been done, and a theoretic foundation for a deepen discussing on the primary theory of the scouring and protection technique of submarine pipelines were presented in this article.