Ma Yi, Zhang Minjia, Luo Huashuai
College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou, China.
Sci Prog. 2020 Jul-Sep;103(3):36850420940885. doi: 10.1177/0036850420940885.
A numerical and experimental study was carried out to investigate the two-phase flow fields of the typical three valves used in the multiphase pumps. Under the gas volume fraction conditions in the range of 0%-100%, the three-dimensional steady and dynamic two-phase flow characteristics, pressure drops, and their multipliers of the ball valve, cone valve, and disk valve were studied, respectively, using Eulerian-Eulerian approach and dynamic grid technique in ANSYS FLUENT. In addition, a valve test system was built to verify the simulated results by the particle image velocimetry and pressure test. The flow coefficient (about 0.989) of the disk valve is greater than those of the other valves (about 0.864) under the steady flow with a high Reynolds number. The two-phase pressure drops of the three valves fluctuate in different forms with the vibration of the cores during the dynamic opening. The two-phase multipliers of the fully opened ball valve are consistent with the predicted values of the Morris model, while those of the cone valve and disk valve had the smallest differences with the predicted values of the Chisholm model. Through the comprehensive analysis of the flow performance, pressure drop, and dynamic stability of the three pump valves, the disk valve is found to be more suitable for the multiphase pumps due to its smaller axial space, resistance loss, and better flow capacity.
开展了一项数值与实验研究，以探究多相泵中使用的典型三种阀门的两相流场。在气体体积分数为0%至100%的条件下，分别采用ANSYS FLUENT中的欧拉-欧拉方法和动态网格技术，研究了球阀、锥阀和盘阀的三维稳态和动态两相流特性、压降及其倍率。此外，搭建了一个阀门测试系统，通过粒子图像测速和压力测试来验证模拟结果。在高雷诺数的稳态流动下，盘阀的流量系数（约为0.989）大于其他阀门（约为0.864）。在动态开启过程中，三种阀门的两相压降随着阀芯的振动以不同形式波动。全开球阀的两相倍率与莫里斯模型的预测值一致，而锥阀和盘阀的两相倍率与奇泽姆模型的预测值差异最小。通过对三种泵阀的流动性能、压降和动态稳定性进行综合分析，发现盘阀因其轴向空间小、阻力损失小和流动能力强，更适合多相泵。
