摘 要：为了研究气液两相混输条件下离心泵叶轮做功原理及能量转换机理，基于欧拉双流体模型，以水和空气为工作介质，在不同初始含气率工况下，利用数值模拟软件CFX对离心泵内流场进行数值计算。结果表明：叶轮流道内气相主要分布在叶片背面及出口边附近；随着初始含气率的增加，气相将在叶片背面形成较为稳定的气泡团，出现严重的相态分离，造成叶轮内出现严重的漩涡、二次流和气塞现象，使离心泵水力损失增加，扬程急剧下降；叶片受到的动反力也逐渐降低，引起叶轮轴向力的加大；同时，含气率的升高加剧了叶轮周向上的不均匀流动，破坏了叶轮径向力的周期性变化。

Abstract:In order to study the principle of work and the mechanism of the energy conversion of the impeller under gasliquid two phase mixed transport condition， the numerical simulation software CFX is used to calculate the flow field in the centrifugal pump. The method is based on the Euler twofluid model， with water and air as the working medium， under different inlet gas volume fraction conditions. The results show that the gas phase in the impeller flow channel is mainly distributed near the blade suction surface and the outlet section. With the increase of the inlet gas volume fraction，the gas phase will form a more stable bubble group on the back of the blade，and the phase separation will occur，resulting in vortex， secondary flow and gas plug in the impeller， which will increase the hydraulic loss of the centrifugal pump and decrease the head dramatically. At the same time，the increase of the inlet gas volume fraction causes the negative reaction force of the blade to be reduced and the axial force of the impeller increased.In addition，the increase in gas volume fraction exacerbates the uneven of gas-liquid two-phase in the impeller cycle， which destroys the periodic variation of the radial force of the impeller. 

TH311

国家自然科学基金(51279172，51769035)；西华大学研究生创新基金（ycjj2017206）