Numerical Simulation of Analysis on Erosion Failure of Right-angle Elbow Pipe | |
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( Volume 2 Issue 7,July 2016 ) OPEN ACCESS | |
Author(s): | |
Dong Liang, Rui Jiang, Longlong Guo, Hongwei Li | |
Abstract: | |
With widespread application of Oil-gas Mixing Transportation, the failure phenomenon caused by corrosion and erosion generally appears in the elbow region of gathering pipelines. The paper utilizes CFD Method and CFX Software to analyze flow field and stress of direct elbow pipe and respectively explore the influences of gaseous and liquid phases on erosion failure of elbow region. As the research shown, the turbulence prediction generated by a large number of liquid phases flowing past outer arch wall surfaces of elbow pipe affected by centrifugal force is the main research for erosion failure firstly occurred in arch walls, and meanwhile, secondary flow phenomenon generated by gaseous phase extends the distribution scope of erosion failure in walls of downstream pipes of elbow region. In addition, although the shear stress in wall is quite small, it plays a promotion role in exfoliation of corrosion product film in pipe wall in order to speed up the failure. Fluid erosion destroys corrosion product film in wall and aggravates its exfoliation, which is the reason for elbow failure. |
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