自吸泵自吸过程气液两相流动特性

为了研究自吸泵自吸过程内部流动规律,以一台外混式自吸式离心泵为研究对象进行气液两相流动定常数值模拟,分析在不同进口含气率下叶轮和蜗壳气液两相分布以及平均静压分布规律,为自吸泵的优化设计提供依据.研究结果表明:气相最先聚集在靠近叶轮进口的叶片背面和隔舌区域,并随着进口含气率的增大,气相逐渐向叶轮和蜗壳流道内扩散,这不利于...

Characteristics of gas-liquid two-phase flow in self-priming pump

To study the internal flow behaviors in the self-priming process of self-priming pump,the gas-liquid two-phase steady numerical simulation was carried out based on an external mixing self-priming centrifugal pump.The gas-liquid two-phase distribution and average static pressure distribution of impeller and volute under different inlet gas content were analyzed.It provides a basis for the optimal design of self-priming pump.The results show that the gas phase first accumulates at the back of the blade and the tongue area near the impeller inlet.With the increase of the inlet gas content,the gas phase gradually diffuses into the impeller and volute channel,which is not conducive to the transportation of two-phase flow,and affects the self-priming performance of the pump.The gas content in the circumferential and axial plane of the impeller is similar to that in the inlet,but the gas content in the axial plane of the volute is quite different from that in the inlet.The low pressure area in the impeller and the volute decreases gradually with the increase of gas content,but the average static pressure value increases gradually.With the increase of relative height and the decrease of inlet gas content,the average pressure in the axial plane of the impeller decreases obviously,while the average pressure in the axial plane in the volute decreases first and then increases.When the gas content exceeds 10%,the head decreases obviously,and the hydraulic performance of the pump is greatly affected by the inlet gas content.