Acoustic wave characteristics and propagation law of hot water heating pipeline leakage

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.