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| Analysis of the acoustic field induced by buried gas pipe leakage using the coupled method of CFD-DEM |
| WANG Qiang1, XUE Sheng1，2, ZHENG Xiaoliang3, ZHANG Lei1, XIE Xiaoxian1 |
| 1.School of Safety Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China；
2.Joint National-Local Engineering Research Centre for Safe and Precise Coal Mining, Anhui University of Science and Technology, Huainan 232001, China;
3.School of Electrical and Information Engineering, Anhui University of Science and Technology, Huainan 232001, China |
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Abstract The generation mechanism and characteristics of the acoustic field induced by buried gas pipe leaks are not clear, which restricts the development of acoustic-based pipe leak detection. To address this, a coupling method using computational fluid dynamic (CFD) and discrete element method (DEM) was employed to analyze the fluid-solid interaction of buried pipe leaks. The broadband noise source model and array imaging technique were combined to analyze and test the leak-induced acoustic field. The results of numerical simulation show that the leak-induced high-speed jet scours the soil and generates a cavity out of the leak hole, with the quadrupole acoustic source being generated in the leak hole and soil cavity. Flow speed and turbulence energy were found to be reduced by the block of soil. Energy is transferred from the fluid to the soil particles, and the motion speed of the soil particles reaches 10 m/s. Under the 1-MPa internal pressure of pipe, the maximum flow speed of leak jet exceeds 1000 m/s and the generated aeroacoustics have a sound pressure level of over 180 dB. Comparing with the other directions, when the leak hole was upward the cavity is enlarged and the energy of flow and acoustic fields is enhanced. The imaging of acoustic field verified that the acoustic source is coincided with the leak. Leak detection using ground array is feasible.
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Received: 20 September 2022
Published: 28 September 2023
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