一种考虑虚拟质量力的两相压力波速经验模型

前人建立的两相压力波速经验模型未考虑虚拟质量力，本文考虑虚拟质量力、管壁弹性、管壁粗糙度等因素，通过求解双流体模型的小扰动，提出了一种新的气液两相压力波速经验模型．以一个具体的工程实例为背景，运用数值方法对其求解，得到的计算结果与前人实测的实验数据一致．结果表明，当空隙率较小时(0＜Φ＜15%)时，虚拟质量力对压力波速的影响不大，当空隙率较大时(Φ≥15%)，考虑虚拟质量力计算的压力波速远大于不考虑虚拟质量力计算的压力波速．经验公式也可达到准确求解压力波速的目的．

An Empirical Pressure Wave Velocity Model for Two-Phase Flow by Considering Virtual Mass Force

The previous empirical pressure wave velocity model for two-phase flow was proposed without consideration of virtual mass force. In this paper, with consideration of virtual mass force, wall elasticity, wall roughness and other factors, a new empirical pressure wave velocity for gas-liquid two-phase flow was proposed by solving the small disturbance of two-fluid model. Taking a specific engineering example as back ground, solutions were obtained by numerical calculation, which agree well with the past results of experimental measurements. The results show that the effect of the virtual mass force on the velocity is small, when void fraction is small (0<Φ<15%). Whereas the pressure wave velocity calculated by considering of the virtual mass force is much larger than that without consideration of virtual mass force when the void fraction is larger (Φ≥15%). In addition the empirical model can also be used for the accurate prediction of pressure wave velocity.