CAJ | 학술논문

管道泄漏声源特性和传播机理决定了音波法在管道上的可检测性，管道泄漏引发的音波能量大小和其沿管道传播的衰减程度分别与泄漏口径大小、管道内压和管道长度等因素有关。以天然气管道泄漏时的气动噪声为研究对象，采用适用于高马赫数流场的Mhring声类比对其进行模拟计算，建立了不同压力、不同泄漏孔径条件下的天然气管道泄漏噪声仿真模型，得到了天然气管道泄漏声源的相关特性，利用试验数据验证了计算模型的准确性。以该声源模型为基础，建立了音波在管道内的二维传播模型，通过模拟结果与现场试验的比较分析，表明天然气管道泄漏音波的超低频段（低于5 Hz）可在管道内传播较远距离并能被声波传感器所探测，从理论上验证了音波法在天然气管道泄漏检测领域的良好应用前景。
관도설루성원특성화전파궤리결정료음파법재관도상적가검측성，관도설루인발적음파능량대소화기연관도전파적쇠감정도분별여설루구경대소、관도내압화관도장도등인소유관。이천연기관도설루시적기동조성위연구대상，채용괄용우고마혁수류장적Mhring성류비대기진행모의계산，건립료불동압력、불동설루공경조건하적천연기관도설루조성방진모형，득도료천연기관도설루성원적상관특성，이용시험수거험증료계산모형적준학성。이해성원모형위기출，건립료음파재관도내적이유전파모형，통과모의결과여현장시험적비교분석，표명천연기관도설루음파적초저빈단（저우5 Hz）가재관도내전파교원거리병능피성파전감기소탐측，종이론상험증료음파법재천연기관도설루검측영역적량호응용전경。
The detectability of acoustic methods for pipeline leakage is jointly determined by the characteristics of acoustic sources and the propagation mechanism of acoustic signals.The acoustic energy caused by pipeline leakage and the attenuation of its propagation along the pipeline are respectively related to the size of leakage hole and the operation pressure and length of pipeline.The aero-acoustic noise generated by pipeline leakage is simulated by using Mhring acoustic analogy,and an aero-a-coustic simulation model for gas pipeline leakage associated with different pressures and leak-hole sizes are established.The characteristics of acoustic source in pipeline leakage are obtained,and the accuracy of the proposed simulation models is valida-ted with experimental data collected with the pipeline leakage simulation platform.The aero-acoustic simulation model is then used to establish a two-dimensional propagation model for acoustic waves in pipeline,and the simulated data are compared with field data for validation.The results show that acoustic waves of ultralow frequency (<5 Hz)can propagate in pipeline for a long distance and are capturable by acoustic sensor.The acoustic methods have a great application prospect in gas pipeline leak detection theoretically.