Study on Leak-Acoustics Generation Mechanism for Natural Gas Pipelines

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Journal of Vibration and Shock ›› 2013, Vol. 32 ›› Issue (7) : 17-23.

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Study on Leak-Acoustics Generation Mechanism for Natural Gas Pipelines

LIU Cui-wei，LI Yu-xing，WANG Wu-chang，FU Jun-tao，FANG Li-ping

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Abstract

In order to study the law and the use of leak detection and location for gas pipelines based on acoustic method, a research is made on leak-acoustics generation mechanism for natural gas pipelines. First the aero-acoustics generation mechanism is ensured in theory so that the wave equation of sources can be concluded when gas pipelines are leaking. Secondly, the leak-acoustics which are generated by the quadrupole sonic sources and the dipole sonic sources are simulated to analyze the law of their characteristics. Thirdly the leak-acoustics are acquired by experiments as the same conditions as the simulation after which the leak-acoustics simulated are compared with the experimental leak-acoustics to testify the simulation method. And then the comparative analyses are accomplished between the leak-acoustics simulated and the leak-acoustics acquired by experiments under variable operating conditions. At last the law and the use of leak detection and location for gas pipelines based on acoustic method are concluded after analyzing the leak-acoustics generation mechanism and the working principle of dynamic pressure sensors. The results indicate that it is the quadrupoles and the dipoles generated by turbulent fluctuations that causes the leak-acoustics. And the main part of pressure perturbations acquired by dynamic pressure sensors is acoustic perturbations. And both the simulation method and the experiment method can be applied to study the leak-acoustics generation mechanism for natural gas pipelines.

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gas pipelines / leak-acoustics / generation mechanism / simulation study / experimental study / pressure perturbations

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LIU Cui-wei;LI Yu-xing;WANG Wu-chang;FU Jun-tao;FANG Li-ping. Study on Leak-Acoustics Generation Mechanism for Natural Gas Pipelines[J]. Journal of Vibration and Shock, 2013, 32(7): 17-23