Remaining erosion life of pipelines with defects based on CFD and grey theory
In order to reduce the failure behavior of pipeline transportation systems affected by erosion wear caused by solid-liquid two-phase flow,the erosion model of pipelines with defects was established by using Fluent software with a 30°bending pipe as the research object,and the erosion characteristics under different defect sizes and service time were analyzed.Then,multiple prediction models of wall thickness thinning were established based on gray theory.Finally,the remaininglife of the pipeline was evaluated according to the state damage classification standard of erosion.The results show that the division of the coreerosionwear zone and affected zone in the 30°bend pipeis not obvious,and the erosionrate is larger atthe axial angle of 0°～45°.The defect depth and defect length have a great influence on the maximum erosion rate.The average relative errors of the GM(1,1)model,unbiased grey model,and unbiased grey-Markov chain model are 3.92%,2.71%,and 0.69%,respectively.The maximum relative error between the predicted value and the actual value of wall thickness thinning is 6.47%during site verification,which proves the reliability and superiority of the unbiased gray-Markov chain model.The research results can provide a practical reference for regular non-destructive testing of bending pipes and key parts.
CFDgrey theorypipeline with defectserosionremaining lifeMarkov chain
万方数据
维普
