Abstract:Considering the problem that the erosion and corrosion from the pipe wall will lead to the leakage of the fluid,the ultrasonic Doppler velocity profiler (UVP) is used to measure the fluid velocity distribution in the pipeline to determine damage degree of the pipe wall.Numerical simulations are carried out to analyze the fluid state under different reynolds numbers and different defects by establishing a fluid model in the pipeline with defects.Using the plexiglass with different prefabricated defects wall thickness as an experimental object.The parameters of UVP include the ultrasonic basic frequency is 8MHz and the incident angle is 10 degree,respectively.Both the CFD numerical simulation and the UVP experimental results show the fluid velocity distribution has a great difference at different locations from the defect,which is manifested by the fact that the defect is larger at the defect location to cause the fluid velocity distribution gentler.Vortex phenomenon occurs at the defect critical location, which increases distinctly with the increasing of the defect and flow rate.There is no obvious difference between the fluid velocity distribution after and before the location of the defect.
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