With the Particle Image Velocimetry (PIV) rapid development in recent years, its applied range has become widely. PIV has became a kind of effective means for the complex flow field. Although many research on internal flow of centrifugal pump has been carried out,there are still many problems due to its complexity. In order to reveal the control law of the centrifugal pump flow,a combination way of numerical simulation and experimental research was adopted in this paper. The results of the research provide ...