泄漏孔孔形对输气管道泄漏声源特性的影响

Influence of leakage hole shape on the leakage sound source characteristics of gas pipeline

为研究泄漏孔孔形对输气管道泄漏声源特性的影响,利用输气管道泄漏声波测试实验平台,开展圆形孔、三角形孔、矩形孔和不规则形孔的泄漏实验。结果表明,不同孔形的泄漏声源频谱均在50~52 kHz范围内存在突出频响。管道压力的增加导致气体动量发生变化,圆形孔的幅值和平均信号电平(ASL)值随压力的增加呈线性规律增加,振铃计数随压力增加呈先增后减的变化趋势。矩形孔、三角形孔和不规则形孔的幅值、ASL值、振铃计数随着压力增加都呈先增后减的变化趋势;孔形的不同影响气体撞击作用,圆形孔的幅值、ASL值、振铃计数小于其他3种孔形的幅值、ASL值、振铃计数。该实验结论有助于输气管道泄漏研究的深化,为声波检测法的开发和应用提供参考依据。

In order to study the influence of the shape of leakage holes on the characteristics of the sound source of leakage in the gas transmission pipeline,the leakage experiments of circular holes,triangular holes,rectangular holes and irregular holes were carried out by using the test platform of sound wave leakage in the gas transmission pipeline.The experimental results show that there are prominent frequency responses in the range of 50-52 kHz in different holes.The increase of pipeline pressure leads to the change of gas momentum.The amplitude and average signal level(ASL)of the circular hole increase linearly with the increase of pressure,and the ringing count increases first and then decreases with the increase of pressure.The amplitude,ASL value and ringing count of rectangular hole,triangle hole and irregular hole increases first and then decreases with the increase of pressure.The amplitude,ASL value and ringing count of the circular hole are smaller than the amplitude,ASL value and ringing count of the other three types of hole.The experimental results are helpful to the research of gas pipeline leakage and provide reference for the development and application of acoustic detection method.