中文摘要：

采用一维双流体模型，利用小扰动原理研究了压力波在水气两相泡状流中的传播规律。针对水利工程中高速掺气水流的特点，对方程进行合理模化和封闭。详细分析了掺气浓度、压力、扰动频率、相间相互作用力对掺气水流中声波传播速度和衰减的影响。结果表明，适当的掺气浓度会使掺气水流的声速显著降低；压强的减小和相间传热的增强可使声速减小、衰减加快；虚拟质量力主要影响高频声速，并使声波衰减减慢。

英文摘要：

With a one-dimensional two-fluid model and employing the small perturbation analysis, the prop- agation of the pressure wave in the water-gas two-phase bubbly flow was investigated. The governing equa- tions are simplified and closured according to high-speed aerated flow characteristics in hydraulic engineer- ing. The effects of aerated concentration, liquid pressure, perturbation frequency and interracial forces on the acoustic wave velocity and its attenuation in the aerated flow are explored in detail. The results show that the sound velocity of the aerated flow decreases significantly with aerated concentration; the decrease of pressure and enhancement of heat transfer can reduce sound velocity while accelerate attenuation of sound wave; the virtual mass force mainly affects high-frequency sound velocity and slows down the sound wave attenuation.