输水管道瞬态泄漏检测数值方法与试验研究

Study on Transient Leakage Detection Method and Experiment for Water Supply Pipelines

为分析非稳态摩擦、管壁黏弹性等因素对泄漏的动态影响,首先根据密闭管道瞬态水流能量守恒理论,考虑非稳定摩擦中的动态项和管壁的黏弹性效应,构建水力瞬态管网泄漏数值模型,改进瞬态水流逆分析法(ITA),在山东省许家崖水库灌区开展野外试验,假定泄漏过程呈准正态分布,基于现场水流瞬态试验数据,模拟管线泄漏位置和泄漏量,用ITA方法计算模拟误差。结果表明,当试验管线发生单点泄漏时,模拟计算泄漏位置平均误差为1.44%,最大误差为6.89%,泄漏孔口面积平均误差为3.85%,最大误差为14.77%,当试验管线发生多点泄漏时,计算泄漏位置平均误差为1.31%,最大误差为3.91%;泄漏孔口面积平均误差为1.74%,最大误差为4.35%。研究结果可为供水管网泄漏检测提供理论和技术支持。

To analyze the impact of unsteady state friction and tube wall viscoelastic on leakage, based on the energy conservation theory of the transient flow in a closed pipeline, the leakage numerical model for the hydraulic transient pipeline was constructed considering the dynamic term in the unstable friction and the elastic viscosity effect of the pipe wall. The transient flow reverse analysis method(ITA) was improved. As a case study, Xujiaya Reservoir Irrigation District in Shandong Province was selected to carry out field experiments. The leakage process was assumed to be quasi-normal distribution. Based on the field water flow transient test data, pipeline leakage location and leakage amount were simulated. The simulated error was calculated by the ITA method. When a single point leakage occurs in the experimental pipeline, the average location error of the simulated leakage is 1.44%, and the maximum error is 6.89%, the average area error of the simulated leakage hole is 3.85%, and the maximum error is 14.77%. When multipoint leakage occurs in the experimental pipeline, the average error of the simulated leakage location is 1.31% and the maximum error is 3.91%;the average area error of the simulated leakage hole is 1.74% and the maximum error is 4.35%. The study results could provide theoretical and technical support for the leakage detection of water pipelines.