管道系统泄漏的可控低强度瞬变流检测法

Leak Detection in Pipe Using Controllable and Low-pressure Transient Analysis Method

为解决瞬变流泄漏检测法应用于工程实践所面临的瞬变流激发困难、强度难以控制、需要阀门流阻特性等技术难题,借鉴空气罐这一水锤防护设备,基于高压气体膨胀、驱使下侧水体进入待检测管道、制造流量突变、激励瞬变流的流体动力学特征,设计了一种新型瞬变流激发器,并提出了以该设备为核心的管道系统泄漏检测法.通过数理分析构建了系统及激发器的理论模型,给出了数值求解算法.针对具体算例设计了瞬变流激发器,研究了所提出方法的检漏性能.结果表明,激发器所激励的瞬变流是低强度的,可以通过改变初始气体压力来控制压力幅值;提出的瞬变流泄漏检测法能够较为准确地辨识管道的泄漏信息.

Leak detection in pipelines using transient analysis is still challenging in hydraulic transient actuation, due to the uncontrollability of pressure amplitude peaks and the missing of prior information.To solve the problem, a novel hydraulic transient actuator was proposed based on the air chamber, in which high-pressure air expands and drives water into pipes to induce sharp discharge change and transient flow.With the actuator, a new leak detection method was proposed in this study.This yields a theoretical model for the actuator and the controlling system with a giving numerical algorithm.The model is further applied and validated in several cases.The simulated result shows that the hydraulic transient process induced by the actuator is low-strength, and it is correlated with the initial air pressure inside.The new leak detection method performs well in identifying the leakage information in pipelines.