| Pump sump is the connection in front of the inlet of the pump. The design of the pump sump has a directly effect on the running efficiency and security performance of the pump system. The flow conditions in the pump sump are very complex. Kinds of vortices occur especially in and around the pump bell. These are common problems, which lead to poor pump performance. With the rapidly increasing awareness of pump efficiency, more and more attention has been paid to the appropriate design of pump sump. A critical developing trend of pump sump is to develop new type pump sump based on the rule of inner flow field.In present thesis, PIV technology has been researched first. By the research on the application range and the theory of PIV technology, it was demonstrated that PIV technology can be used to research the flow field of pump sump, and the process of measurement was made. Then, in this paper, PIV techniques are used to measure the flows in a model pump sump and an improving one with a T-type baffle. The performance of the pump sump was obtained by analyzing the pictures of velocity, streamline, turbulent kinetic energy and vorticity. The experiment results are compared with each other with the circulation, three-dimensional velocity and three-dimensional turbulent kinetic energy. Then conclusion can be obtained that the model pump sump with a T-type baffle can improve the performance of the pump system.The other work was the research of scale effect. Many problems of engineering can't get answer only by theory analysis, it must be instead of experiment. Theory of similarity is the theoretical basis of experiment, and it is also an important means by which we can analyze the phenomenon of liquid flow. In this paper, we use the model to study the liquid flow, the liquid flow in the model is similar with theprototype's, but the scale is shrunk. For the result of mode can be applied to the prototype, the result of scale effect was made in the paper.
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