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500μm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。
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.
作者
杨湘愚
关蕾
李雨
张永康
王冠
闫德俊
YANG Xiangyu;GUAN Lei;LI Yu;ZHANG Yongkang;WANG Guan;YAN Dejun(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;Guangdong Provincial Key Laboratory of Advanced Welding Technology for Ships,CSSC Huangpu Wenchong Shipbuilding Company Limited,Guangzhou 510715,China)
出处
《中国腐蚀与防护学报》
CAS
CSCD
北大核心
2022年第6期979-987,共9页
Journal of Chinese Society For Corrosion and Protection
基金
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和202102020626)
中国博士后科学基金(2020M682929)。
关键词
冲刷腐蚀
正交试验
数值模拟
90°弯管
腐蚀速率
erosion-corrosion
orthogonal test
numerical simulation
90°elbow
corrosion rate