摘要
埋地输气管道泄漏声场产生机理和特性尚不明确,制约着管道泄漏声波检测技术的发展。使用计算流体力学(computational fluid dynamic,CFD)与离散元(discrete element method,DEM)耦合方法分析管道泄漏的气固作用,结合宽频噪声源模型和阵列成像技术进行泄漏声场分析和测试。数值模拟结果表明,泄漏高速喷流冲击土壤致使泄漏孔外部形成空洞,并在泄漏孔和空洞内产生四极子声源。土壤阻隔导致流体速度和湍流动能减小,能量由流体传递至土壤颗粒,土壤颗粒运动速度达到了10 m/s。1 MPa管道内压下,泄漏喷流的最大流速超过1000 m/s,由此产生的气动噪声声压级达到了180 dB。相较于其他方向,泄漏孔向上时空洞更大,流场和声场能量更强。声场成像结果证明泄漏孔与声源重合,基于地面阵列的泄漏检测具有可行性。
The generation mechanism and characteristics of the acoustic field induced by buried gas pipe leakage are not yet clear,which restricts the development of acoustic-based pipe leak detection.To address this,a coupled method of computational fluid dynamics(CFD)and discrete element method(DEM)was employed to analyze the fluid-solid interaction of buried pipe leakage.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 outside the leak hole,which leads to generate a quadrupole acoustic source in the leak hole and soil cavity.Flow speed and turbulence energy are found to be reduced by the block of soil.Energy is transferred from the fluid to the soil particles,and makes the motion speed of the soil particles reach 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 aero noise has a sound pressure level of over 180 dB.Comparing with other directions,when the leak hole is upward,the cavity is enlarged and the energy of flow and acoustic field is enhanced.The imaging of acoustic field verifies that the acoustic source is coincided with the leak hole.Leak detection using ground array is feasible.
作者
王强
薛生
郑晓亮
张磊
谢晓贤
WANG Qiang;XUE Sheng;ZHENG Xiaoliang;ZHANG Lei;XIE Xiaoxian(School of Safety Science and Engineering,Anhui University of Science and Technology,Huainan 232001,China;Joint National-Local Engineering Research Centre for Safe and Precise Coal Mining,Anhui University of Science and Technology,Huainan 232001,China;School of Electrical and Information Engineering,Anhui University of Science and Technology,Huainan 232001,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2023年第18期321-331,共11页
Journal of Vibration and Shock
基金
国家自然科学基金(51934007)
山东省重大科技创新工程项目(2019JZZY020504)。
关键词
埋地管道泄漏
流固耦合
气动声学
声场成像
颗粒运动
buried pipe leak
fluid-solid coupling
aeroacoustics
acoustic field imaging
particle motion
