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Study on leak-acoustics generation mechanism for natural gas pipelines
Affiliation:1. College of Pipeline and Civil Engineering in China University of Petroleum (East China), Qingdao 266555, China;2. College of Information and Control Engineering in China University of Petroleum(East China), Qingdao 266555, China;1. College of Information and Control Engineering, China University of Petroleum, Qingdao 266580, China;2. Colorstone Leakage Supervisory Technology Company, Dongying 257000, China;1. School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China;2. School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou, China;1. Department of Biosystem Eng., State University of São Paulo (UNESP), Tupã Campus, Av. Rua Domingos da Costa Lopes, Jardim Itaipu, 780, 17602-496, Tupã, Brazil;2. Department of Mechanical Eng., State University of São Paulo (UNESP), Ilha Solteira Campus, Av. Brasil Centro, 56, 15385-000, Ilha Solteira, Brazil;3. Institute of Sound and Vibration Research (ISVR), Faculty of Engineering and the Environment, University of Southampton, University Road, SO17 1BJ Southampton, United Kingdom;4. Key laboratory of Noise and Vibration Research, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190 China;1. College of Civil Engineering, Tongji University, Siping 1239, Shanghai 200092, China;2. The State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Siping 1239, Shanghai 200092, China;1. College of Electronic Information and Automation, Tianjin University of Science & Technology, Tianjin, 300222, PR China;2. State Key Laboratory of Precision Measuring Technology & Instruments, Tianjin University, Tianjin 300072, PR China;3. Pipeline R&D Center, CNCP, Langfang, Hebei, 065000, PR China
Abstract:In order to figure out the principles of acoustic leak detection for natural gas pipelines, a study on the leak-acoustics generation mechanism is carried out. The aero-acoustics generation mechanism is analyzed and when leakage occurs the wave equations of sonic sources are developed. The leak-acoustics generated by the quadrupole and dipole sonic sources are then simulated to obtain the laws of the acoustic characteristics. The simulation data are compared with the experimental data to verify the simulation accuracy under variable operating conditions. The results show that the quadrupoles and the dipoles generated by turbulent fluctuations cause leak-acoustics; the main component of pressure perturbations acquired by the dynamic pressure sensor is acoustic perturbations; both the simulation method and the experimental method can be applied to study the leak-acoustics generation mechanism of natural gas pipelines.
Keywords:Natural gas pipelines  Leak-acoustics  Generation mechanism  Pressure perturbations
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