Critical Flow Velocity Analysis of Multi-Span Viscoelastic Micro-Bending Irrigation Pipelines

文献类型： 外文期刊

第一作者： Wu, Sihao

作者： Wu, Sihao;Fan, Bo;Cao, Jianhua;Xiao, Suwei;Cao, Yuhe

作者机构：

关键词： critical flow velocity; multi span; micro bending; viscoelasticity; irrigation pipeline

期刊名称：AGRICULTURE-BASEL （ 影响因子：3.6； 五年影响因子：3.8 ）

ISSN：

年卷期： 2025 年 15 卷 11 期

页码：

收录情况： SCI

摘要： Irrigation pipelines are critical agricultural hydraulic facilities that often develop minor bending defects due to ground settlement or improper installation. This study employs Lagrange equations for non-material volumes and the Absolute Nodal Coordinate Formulation (ANCF) to model the multi-span viscoelastic micro-bending irrigation pipelines, investigating the influence of micro-bending defects on critical flow velocity. The material parameters of the pipeline wall are determined via uniaxial tensile tests, and the effectiveness of the proposed model is validated through comparison with degraded models and field tests. Further numerical analysis demonstrates that modifying the micro-bend defect of the pipeline from a parabolic to a sinusoidal shape yields a 13.9% enhancement in critical flow velocity. This improvement is particularly significant for irrigation projects with limited pipe material options, tight flow design margins, and low economic returns.

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