Numerical analysis of internal complex flow in a deep - sea gas - liquid two - phase flow multistage centrifugal pump

Abstract

Based on a multistage gas-liquid centrifugal pump as the research object, considering the buoyancy and surface tension of gas at the same time, the N-S equations and the standard two equations k-ε turbulent model were used for the numerical simulation of triple-stage pump of different gas content, the external characteristics and the internal flow field of the pump were analyzed. The results indicated that with the increasing of gas content, the head and efficiency of the pump were reduced, and the decrease rate increases with the increase of the gas content. Under the action of centrifugal force, the gas phase in the impeller mainly gathers near the hub. In this paper, the method of opening the return hole was used to optimize the pump, and the modification was calculated by steady numerical simulation. By analyzing the pump liquid velocity distribution, the axial force and the performance of the pump, to provide the basis for optimizing the performance of the pump.