Intermittent flow is one of the most complex flow patterns in gas-liquid two-phase flow in pipelines. The leakage of pipeline intermittent flow poses a threat to the operating safety. In order to improve the application of acoustic method to gas-liquid two-phase leakage detection, the amplitude characteristics and propagation velocity of dynamic pressure wave of intermittent flow for gas-liquid two-phase pipeline leakage were investigated. Experiments with conditions of superficial liquid velocity (v_sL) from 0.57 m/s to 1.06 m/s, superficial gas velocity (v_sG) from 0.3 m/s to 4.47 m/s, leakage aperture from 4 mm to 9 mm were carried out, and the characteristics were studied by time-domain analysis, frequency-domain analysis and time-frequency analysis. The propagation velocity formula of dynamic pressure wave in two-phase medium was fitted based on Levenberg-Marquardt algorithm, and the propagation velocity of straight pipe and elbow pipe was discussed. The experimental results indicate that the peak-to-peak value of dynamic pressure wave measured by sensor within 4.25 m increases during top or mid sustained leakage when leak aperture is larger than 4 mm in elongated bubble flow and 6 mm in slug flow. The amplitude of sustained leakage dynamic pressure increases as gas flow rate increases. The low frequency energy of signal increases immediately when leakage occurs, the energy of signal mainly concentrates at 0–15 Hz, the frequency amplitude of sustained leakage signal is much higher than normal flow signal and leak occur signal. As the gas volume fraction β increases from 0.23 to 0.75, the dynamic pressure propagation velocity decreases from 33.13 m/s to 26.5 m/s and then increases from 26.5 m/s to 66.25 m/s. The propagation velocity increases when it flows through an elbow pipe section. The results are meaningful for further study of two-phase pipeline slug flow leakage detection and location.

断续流是管道气液两相流中最复杂的流型之一。管道间断流的泄漏对运行安全构成威胁。为提高声学方法在气液两相泄漏检测中的应用，研究了气液两相管道泄漏间歇流动压力波的幅值特性和传播速度。在表观液体速度 ( v _sL ) 从 0.57 m/s 到 1.06 m/s、表观气体速度 ( v _sG )条件下进行的实验)从0.3 m/s到4.47 m/s，泄漏孔径从4 mm到9 mm进行了研究，并通过时域分析、频域分析和时频分析研究了其特性。基于Levenberg-Marquardt算法拟合了动压波在两相介质中的传播速度公式，讨论了直管和弯管的传播速度。实验结果表明，当泄漏孔径在细长气泡流中大于4 mm和在段塞流中大于6 mm时，传感器在4.25 m内测量的动态压力波峰峰值在顶部或中部持续泄漏期间增加。持续泄漏动态压力的幅度随着气体流速的增加而增加。当发生泄漏时，信号的低频能量立即增加，信号能量主要集中在0-15Hz，持续泄漏信号的频率幅度远高于正常流量信号和泄漏发生信号。作为气体体积分数β从 0.23 增加到 0.75，动压传播速度从 33.13 m/s 减少到 26.5 m/s，然后从 26.5 m/s 增加到 66.25 m/s。当它流过弯管段时，传播速度会增加。研究结果对两相管道段塞流泄漏检测与定位的进一步研究具有重要意义。