In high gas-bearing conditions, the oil phase—in the form of droplets— often enters the reciprocating multiphase pump via the valves. Understanding the droplet-carrying characteristics of the gas flow is important for determining the transport capacity and stability of multiphase pump valves. In this paper, the turbulent gas flow and droplet movement behaviors in three typical valves of the reciprocating multiphase pumps were studied mainly by the theoretical analysis, the numerical simulation of computational fluid dynamics (CFD) and the verification test of particle image velocimetry (PIV). The steady and transient droplet trajectories, concentration distributions, and passing capacities were comprehensively studied with different valve openings, Reynolds numbers, and two-phase slip conditions. The results show that the ball valve performs steadily during the transport of the small to large droplets, while the cone valve and the disk valve perform well when transporting the small droplets with d≤250μm and the medium-sized droplets with 300μm≤d≤600μm under the initial conditions, respectively. Finally, the correlations of the volume mean diameter (d_vm) of the droplets successfully passing through the cavities were proposed for the three valves. The results of this study are beneficial to help optimize and design new high-efficiency multiphase transport systems.

在高含气条件下，油相（呈液滴形式）通常会通过阀门进入往复式多相泵。了解气流的液滴携带特性对于确定多相泵阀的输送能力和稳定性很重要。本文主要通过理论分析，计算流体动力学（CFD）的数值模拟和粒子图像测速技术（PIV）的验证测试，研究了往复式多相泵的三种典型阀门中的湍流和液滴运动行为。 。在不同的阀门开度，雷诺数和两相滑移条件下，对稳态和瞬态液滴的轨迹，浓度分布和通过能力进行了综合研究。d ≤250μm并且与300μm≤中型液滴d分别处于初始条件下≤600μm。最后，针对三个阀提出了成功通过空腔的液滴的体积平均直径（d _vm）的相关性。这项研究的结果有助于优化和设计新的高效多相运输系统。