热水供热管道泄漏声波特性与传播规律
Acoustic wave characteristics and propagation law of hot water heating pipeline leakage
摘要：
直埋供热管道泄漏点的非开挖精准定位是城市集中供热管网安全高效运行的重要保障。采用数值模拟与实验相结合的方法，基于声波法研究了热水供热管道的泄漏声波特性与传播规律，模拟了不同水压、水温及泄漏孔径条件下热水供热管道泄漏时流体声场特征，并进行了实验验证。结果表明：热水供热管道泄漏管内流体声信号主频段为0～20 Hz；泄漏量与声压级随水压与泄漏孔径的增大而增大，随水温升高而略有减小；声压级随传播距离与管径的增大而衰减，声压级随传播距离的增大呈现快速衰减段和稳定段，在距泄漏孔1 m之外为稳定段。
Abstract：
The precise location of the leakage point of the directly buried heating pipeline without excavation is an important guarantee for the safe and efficient operation of the urban central heating pipeline network. Using the method of numerical simulation and experiment, this paper studies the leakage acoustic wave characteristics and propagation law of hot water heating pipelines based on the acoustic wave method, simulates the characteristics of the fluid sound field when the hot water heating pipeline leaks under the conditions of different water pressure, water temperature and leakage aperture, and verifies them by experiments. The results show that the main frequency band of the fluid sound signal in the leakage pipe of the hot water heating pipeline is 0 to 20 Hz. The leakage volume and sound pressure level increase with the increase of water pressure and leakage aperture, and decrease slightly with the increase of water temperature. The sound pressure level attenuates with the increase of propagation distance and pipe diameter, the sound pressure level presents a rapid attenuation section and a stable section with the increase of propagation distance, and it is a stable section 1 m away from the leakage hole.
Keywords:heating pipeline; leakage; acoustic wave; propagation; sound pressure level; main frequency band; water pressure