Instantaneous gas–liquid flow and distribution have an important influence on the performance of a multiphase pump, especially under the high gas content conditions. How to accurately simulate the complete working cycle of a multiphase pump and reflect the transient oil-gas flow inside the pump cavity are the main difficulties of the study. A three-dimensional whole-cycle numerical simulation has been conducted to predict the void fraction waves of the reciprocating multiphase pumps under the high gas rates and to evaluate the effects of multi-case parameters on its pulsation characteristics. The instantaneous two-phase distribution and fluctuation characteristic accompanying the movement of the piston and the valves during each process of the multiphase pump are innovatively obtained under the high gas rates. Five different ideal gas model and real gas models used in this simulation are compared and optimized first, and then validated by the experimental results. Void fraction wave signals in the time and frequency domains are obtained from multiple working cycles of the multiphase pump, and the pulsation rates, propagation speeds, amplitudes, and power spectral densities are analyzed in great detail under different inlet gas contents, pressure ratios, crank speeds, and stroke lengths.

气液瞬时流量和分布对多相泵的性能有重要影响，尤其是在高含气量条件下。如何准确地模拟多相泵的整个工作循环并反映泵腔内的瞬态油气流量是研究的主要困难。进行了三维全周期数值模拟，以预测高气速下往复式多相泵的空隙率波，并评估多工况参数对其脉动特性的影响。在多气体泵的每个过程中，创新性地获得了在多相泵的每个过程中伴随着活塞和阀的运动的瞬时两相分布和波动特性。首先比较并优化了在此模拟中使用的五个不同的理想气体模型和实际气体模型，然后通过实验结果对其进行了验证。从多相泵的多个工作循环中获得时域和频域的空隙分数波信号，并详细分析了不同进气量，压力比，曲柄下的脉动速率，传播速度，幅度和功率谱密度。速度和行程长度。