基于正交试验的90°弯管冲刷腐蚀数值模拟及实验研究

doi:10.11902/1005.4537.2021.325

中国腐蚀与防护学报

2022, Vol. 42

Issue (6): 979-987 DOI: 10.11902/1005.4537.2021.325

研究报告

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基于正交试验的90°弯管冲刷腐蚀数值模拟及实验研究

杨湘愚¹, 关蕾¹(

), 李雨², 张永康¹, 王冠¹, 闫德俊²

1.广东工业大学省部共建精密电子制造技术与装备国家重点实验室广州市非传统制造技术及装备重点实验室广州 510006
2.中船黄埔文冲船舶有限公司广东省舰船先进焊接技术企业重点实验室广州 510715

Numerical Simulation and Experimental Study on Erosion-corrosion of Square Elbow Based on Orthogonal Test

YANG Xiangyu¹, GUAN Lei¹(

), LI Yu², ZHANG Yongkang¹, WANG Guan¹, YAN Dejun²

1. Guangzhou Key Laboratory of Nontraditional Machining and Equipment, State Key Laboratory of Precision Electronic Manufacturing Technology and Equipment, Guangdong University of Technology, Guangzhou 510006, China
2. Guangdong Provincial Key Laboratory of Advanced Welding Technology for Ships, CSSC Huangpu Wenchong Shipbuilding Company Limited, Guangzhou 510715, China

引用本文:

杨湘愚, 关蕾, 李雨, 张永康, 王冠, 闫德俊. 基于正交试验的90°弯管冲刷腐蚀数值模拟及实验研究[J]. 中国腐蚀与防护学报, 2022, 42(6): 979-987.
Xiangyu YANG, Lei GUAN, Yu LI, Yongkang ZHANG, Guan WANG, Dejun YAN. Numerical Simulation and Experimental Study on Erosion-corrosion of Square Elbow Based on Orthogonal Test[J]. Journal of Chinese Society for Corrosion and protection, 2022, 42(6): 979-987.

全文: PDF(6018 KB) HTML

摘要:

采用正交试验和数值模拟相结合的方法,研究了90°弯管在液固两相流条件下,管径 (A)、入口流速 (B)、液体流向 (C)、砂粒直径 (D) 和砂粒质量流量 (E) 5个因素对弯管冲刷腐蚀行为的影响程度大小。结果表明：不同因素对弯管冲刷腐蚀影响的顺序为B>A>E>C>D。当B为5 m/s、A为30 mm、E为0.03 kg/s、C液体流向为水平竖直向上、D为500 μm时,冲蚀速率达到最大,冲蚀速率较大的区域集中在弯管轴向角度60°到90°之间,径向角度180°附近,即位于弯管外侧靠近出口处,实验结果也验证了此种工况下弯管外侧出口处的腐蚀速率更高,同时最优因素水平试验结果也表明：降低入口流速和增大管径能大幅度降低冲蚀速率。

关键词 ：冲刷腐蚀, 正交试验, 数值模拟, 90°弯管, 腐蚀速率

Abstract：

Marine seawater pipeline and various fittings play an important role in cooling and firefighting, among which square elbow is widely used. However, it is found from daily maintenance that the square elbow is also the part mostly prone to leakage. In this paper, the effect of related parameters for pipe, such as diameter (A), inlet velocity (B), liquid flow direction (C), sand diameter (D) and sand mass flow (E) on the erosion-corrosion behavior of square elbow in the condition of liquid-solid two-phase flow was studied by means of orthogonal test and numerical simulation. The results show that the order of influence of different factors on erosion-corrosion of square elbow may be ranked as: B>A>E>C>D. The erosion rate of the square elbow reaches the maximum in case that B is 5 m/s, A is 30 mm, E is 0.03 kg/s, C is the flow direction horizontal and vertical upward, and D is 500 μm respectively. The area with large erosion rate is concentrated in the range between 60° and 90° of the axial angle of the elbow, whilst near 180° of the radial angle, i.e., where located on the outside of the elbow near the exit. The experimental results also verify that the corrosion rate on the outside of the elbow near the exit is higher in this working condition. At the same time, the results of tests by factors of optimal level also show that reducing the inlet velocity and increasing the pipe diameter can greatly reduce the erosion rate.

Key words： erosion-corrosion orthogonal test numerical simulation 90° elbow corrosion rate

收稿日期: 2021-11-15

ZTFLH:

TG174

基金资助:广东省自然科学基金(2021A1515010967);国家自然科学基金(52001074);广州市科技计划项目(202102020723);广州市科技计划项目(202102020626);中国博士后科学基金(2020M682929)

作者简介: 杨湘愚,男,1997年生,硕士生

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https://www.jcscp.org/CN/10.11902/1005.4537.2021.325 或 https://www.jcscp.org/CN/Y2022/V42/I6/979

图1 弯管模型及流动方向

图2 网格数量与最大冲蚀速率的关系曲线

表1 因素水平表

图3 管流式实验装置简图

图4 测试弯管段弯管阵列电极排布

表2 基于正交试验的数值模拟结果

图5 因素指标趋势图

图6 冲蚀速率分布云图

图7 优化试验 (B1A4E1D1C1) 冲蚀速率分布云图

图8 1~5号电极开路电位随时间变化曲线经过12 h实验后的极化曲线

表3 实验12 h后1~5号电极开路电位及其极化曲线拟合数据

图9 1~5号电极12 h 实验后的电化学阻抗谱及等效电路图

表4 电化学阻抗谱拟合结果 (电极面积：0.2826 cm2)

图10 1~5号电极冲刷腐蚀形貌

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