Fluid-solid coupling analysis based erosion destruction invalidation quantitative forecast method

Abstract

The invention discloses a quantitative prediction method of erosion damage failure based on fluid-solid coupling analysis, which includes two processes of corrosion product protective film characteristic analysis and failure prediction analysis under the action of fluid; according to the actual working conditions of the pipeline, the fluid mechanics similarity theory is used , determine the specifications of the pipe fittings to be tested, the test conditions and the fluid medium, and use the electrochemical test method to test the transient characteristics of erosion damage; establish a fluid-solid coupling model, preliminarily set the characteristic parameter values ​​​​of the corrosion product protective film, and apply the finite element method The analysis software performs fluid-solid coupling simulation calculations, combined with experimental research, to correct the characteristic parameter values ​​of the corrosion product protective film; performs fluid-solid coupling simulation calculations for typical pipe fittings in actual pipeline systems, and realizes quantitative prediction of pipeline system erosion damage failures, which can be scientifically and accurately Predict the failure danger point of the entire pipeline system, and provide theoretical support for the safety assurance technology of the pressure pipeline system.

Description

technical field [0001] The invention relates to a method for predicting erosion damage failure of a pipeline system, in particular to a quantitative prediction method for erosion damage failure based on fluid-solid coupling analysis. Background technique [0002] Fluid pipeline is a special equipment for transporting fluid under a certain pressure. It has become one of the five transportation modes alongside road, railway, water transportation and aviation. The transportation of various fluid materials involves various aspects such as energy supply, enterprise production, urban development and people's life. The reliability of its operation is directly related to economic development and public safety, and plays a pivotal role in the national economy. While pipelines provide people with convenient transportation, there are also great potential safety hazards, which are mainly reflected in the erosion and damage of multiphase flow corrosive media to in-service pipeline system...

AI Technical Summary

Problems solved by technology

The determination of the detection position and detection cycle is a big problem. In actual projects, the detection specifications are often formulated based on their own experience, lacking theoretical basis, and it is urgent for researchers to study the erosion law of the pipeline system and quantitatively predict its corrosion rate;

[0006] (2) The current failure prediction of erosion damage is only limited to the analysis of corrosive media and the study of the influence of parameters (such as flow velocity), and has not been based on the systematic research on the coupling effect of corrosion and fluid dynamics, let alone failure prediction. Taking the corrosion product protective film as the object to predict the coupling effect between the medium flow and the pipe wall, it is impossible to accurately predict the failure location and rate of the fluid pipeline

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