排灌机械工程学报
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排灌机械工程学报  2016, Vol. 34 Issue (5): 424-429    DOI: 10.3969/j.issn.1674-8530.15.1081
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局部阻塞对管道瞬变流频响特性的影响分析及应用
刘志勇1, 刘梅清1, 王华超2, 吴远为1
1.武汉大学水力机械过渡过程教育部重点实验室, 湖北 武汉 430072; 2.中国电力工程顾问集团中南电力设计院, 湖北 武汉 430071
Influence of local blockage on pipe transient frequency response characteristic and its application
LIU Zhiyong1, LIU Meiqing1, WANG Huachao2, WU Yuanwei1
1.Key Laboratory of Transients in Hydraulic Machinery, Ministry of Education, Wuhan University, Wuhan, Hubei 430072, China; 2.CSEPDI of China Power Engineering Consulting Group, Wuhan, Hubei 430072, China
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摘要 为了了解局部阻塞对有压管道系统的影响,采用传递矩阵法分析了局部阻塞对管道瞬变流频响特性的影响及频响图的变化形态与阻塞点位置和阻塞局部阻力系数之间的关系,将其应用于管道局部阻塞的检测,并进行了数值试验验证,结果表明:与正常管道相比,局部阻塞点的存在使管道瞬变流频响图中各次谐波的幅值均不再保持定值,而是随着谐波次数的不同呈周期性变化;奇次谐波的幅值随谐波次数周期性变化的主频率及相位与阻塞点的位置相关,而该主频率对应的幅值与局部阻塞的局部水力损失系数相关,据此可进行管道局部阻塞位置和阻塞程度的检测.因此,基于对管道瞬变流频响特性的分析进行管道局部阻塞的检测是可行的.
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刘志勇
刘梅清
王华超
吴远为
关键词瞬变流   频率响应   管道   局部阻塞   检测     
Abstract: Local blockage is a usual fault in pressurized pipe systems. In this study, the influence of a local blockage on the frequency response diagram(FRD)is analyzed and the relationship between the variation pattern of FRD and local blockage parameters, namely the location and resistance coefficient of the blockage is obtained by using transfer matrix method for a pipe system. Then, based on this relationship, a pipe local blockage detection method is proposed and its feasibility is validated through numerical experiments. The results show that the amplitudes of the even harmonics and odd harmonics of a pipe with a local blockage no longer maintain constant compared with a normal pipe, but vary periodically with the harmonic order instead. The main frequency and phase of the odd harmonics reflect the blockage location, and the amplitude of the main frequency is related to the minor resistance coefficient, consequently based on these facts the blockage location and degree can be detected. The numerical experiments confirm that the pipe local blockage detection is feasible based on FRD analysis. 
Key wordsfluid transient   frequency response   pressurized pipe   local blockage   detection   
收稿日期: 2015-12-18;
基金资助:国家自然科学基金资助项目(51279145)
通讯作者: 刘梅清(1960—),男,湖北汉川人,教授,博士生导师(liumq@126.com),主要从事流体机械及工程研究.   
作者简介: 刘志勇(1972—),男,湖北天门人,副教授(liuzy6107@hotmail.com),主要从事流体输送及流体过渡过程研究.
引用本文:   
刘志勇,刘梅清,王华超等. 局部阻塞对管道瞬变流频响特性的影响分析及应用[J]. 排灌机械工程学报, 2016, 34(5): 424-429.
LIU Zhi-Yong-,LIU Mei-Qing-,WANG Hua-Chao- et al. Influence of local blockage on pipe transient frequency response characteristic and its application[J]. Journal of Drainage and Irrigation Machinery Engin, 2016, 34(5): 424-429.
 
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