Santrifüj pompalarda iki fazlı akış özelliklerinin sayısal incelenmesi

Due to its important applications, particularly in the oil and gas industry, two-phase pumping has been the subject of several studies. This study includes a numerical investigation of two-phase flow inside a centrifugal impeller with seven blades, at a rotational speed of 2500 rpm and an inlet pressure of 100000 Pa. The simulation includes investigating the effect of flow rate, gas volume fraction GVF, and bubble sizes on the pump performance curves and also on the phase distribution through the impeller. Four flow rate values of 2.4, 3.1, 3.9, and 4.6 kg/s, four GVF values of 0.1, 0.15, 0.2, and 0.3, and four bubble sizes of 0.1, 0.2, 0.3, and 0.5 mm are considered in the simulation. The governing equation and the turbulent kinetic energy dissipation (k - ε) model are solved using ANSYS software. The results show that increasing the flow rate leads to a decrease in the pump head and hydraulic efficiency under single- and two-phase operations, with reduced performance in the case of the two-phase condition. The head and efficiency are also significantly affected by increasing the GVF and bubble diameter. Increasing the GVF from 0.1 to 0.3 causes the head to decrease by about 26% and hydraulic efficiency by up to 25%. The impact of bubble size, on the other hand, depends on the flow rate and bubble diameter. A significant reduction in pump performance by increasing bubble diameter has been reported for low flow rates, while only a limited impact has been observed for high flow rates, particularly at large bubble sizes. Gas pocket formation has been visualized at the inlet upper pressure side of the impeller blade in cases of high GVF and bubble diameters.