一种新的长输管道泄漏点定位方法

A NEW METHOD FOR LOCATION LEAK IN LONG-DISTANCE PIPELINE

将压力梯度法与逆瞬态法结合,提出了适合长输管道的泄漏点定位方法.该方法将泄漏点前后的摩阻系数以及泄漏流量系数看作优化控制变量、水击方程的数值计算结果与测量值之差的绝对值作为控制目标,利用遗传算法优选泄漏点前后的摩阻系数,与压力梯度法结合不断迭代求解泄漏点的位置.通过输水管道的泄漏实验得到该方法漏点定位的平均误差为4%左右.

For the long-distance pipeline based mainly on frictional head loss,it is necessary to locate the leak point after the leak appears.The researchers have developed many methods for position leak during the past of a few years,such as pressure gradient method,inverse transient method,etc.These methods have their respective advantages and disadvantages for long-distance pipeline.The pressure gradient method is suitable to the pipeline of hydraulic grade line varied linearly.The leak location in the inverse transient method is firstly assumed.Therefore,a new method for location of the leakage points has been developed with the combination of the pressure gradient method and the inverse transient method in this paper.In this scheme,the coefficients of the friction resistance before and after the leakage points,and the coefficients of the leakage flow,are taken as the optimizing control variables,and the difference of water head between the calculated values by waterhammer equations and the measured values at measured sites are utilized as the objective function.The coefficients of the friction resistance before and after the leakage points are optimized through the genetic algorithm,based on which the iterative method is used to locate the leakage points. To verify the new method,the experiment in a water pipe with a length of 48.775 m and a diameter of 53 mm was set up in the hydraulics laboratory of Dalian University of Technology.The pipeline is made of iron pipe,and is connected to the pump at the upstream end and the water flume at the downstream end.The error value of mean location in this method is about 4%,compared with the experimental data.The experimental results show that the method is quite feasible and efficient to locate the leak in long-distance pipeline.