管道系统泄漏检测的瞬变水击压力波法  

Transient Pressure Rise Method for Leak Detection in Pipeline Systems

作　　者：郭新蕾[1] 杨开林[1] 郭永鑫[1] 王涛[1] 付辉[1] 

机构地区：[1]中国水利水电科学研究院,北京100038

出　　处：《应用基础与工程科学学报》2011年第1期20-28,共9页Journal of Basic Science and Engineering

基　　金：国家自然科学基金(50679085);中国水利水电科学研究院专项基金(水集09KY12)

摘　　要：管道系统的泄漏影响着瞬变水击波波形的畸变和衰减特性,比较研究了两种阀门关闭激励速度对管道泄漏瞬变检测精度的影响.在此基础上,基于阀门部分快速关闭,提出管道系统泄漏检测的瞬变水击压力波法,即利用第一个瞬变压力波波形上的间断点时刻定位泄漏位置,间断点衰减幅值辨识泄漏量,并通过不计算管道内部计算断面的特征线法理论推导出了泄漏量参数与该衰减幅值之间的关系式.给出了该方法的检测步骤,并对该法进行了数值验证.仿真结果表明该方法简单、有效.Pipeline leaks contribute to the damping and aberration of hydraulic transient events.The influence of two valve closure rates on leaking accuracy is studied.Based on this,a new method of leak detection and location using the first transient pressure rise is presented.The mechanics depend on the propagation of the pressure wave created from the fast valve closure and the reflected damp wave from the leak.A leak in the pipe gives rise to reflected waves which in turn create discontinuities in the observed signal at the measurement section.The timing of the reflected damp wave and the magnitude represent the location and size of the leak,respectively.A formula is derived based on the MOC to demonstrate the relationship between leakage and reflected magnitude.The leak detection procedure of the method is also given.The method is applied to numerical test with the calibrated leak parameters,and the results prove that it is effective and simple to identify leaks.

关 键 词：泄漏检测 瞬变 升压波 管道系统 

分 类 号：TV131.4[水利工程—水力学及河流动力学]