At present, the main problems existing in the operation and actual production of centrifugal pumps and pump stations are as follows: 1. In most cases, the actual working condition of the centrifugal pump in the pump station often deviates from its design working condition, which reduces the operating efficiency. 2. In most of the centrifugal pump stations in China, especially those with large water level variation, the pump stations often operate under low efficiency conditions, resulting in a large waste of energy. 3. Some large flow centrifugal pumps can not be tested in the laboratory. In order to meet the requirements of water use and the purpose of economic operation, it is often necessary to change the flow and head to change its working point. The internal flow analysis of turbomachinery has always been a hot research issue. Due to the Coriolis force and centrifugal force caused by the rotation and surface curvature of the impeller, the flow in the impeller is quite complex, and often accompanied by flow separation and wake flow. So far, we have not seen a satisfactory centrifugal pump designed by fully applying the three-dimensional theory. For a long time, pump manufacturers have generally adopted the following procedures for the development of new pumps: first design several impellers and pump casings, then establish models, and finally go to the test bench. Through modification, design, and retesting, the procedures can meet the requirements of users. In this way, the characteristic curve of the pump can be estimated according to the hydraulic parameters such as the designed pump impeller and volute (guide vane). Obviously, it can reduce the cost of model making, trial production and test of the pump, and shorten the design and manufacturing cycle, which is of great practical significance. Several important research directions in pump technology at present: 1. Performance study. 2. Operation and fault diagnosis. 3. Cavitation study. 4. Design and product development. 5、CFD。 Pump design, product development and performance research are endless research directions and hot spots in pump products. The research in these two aspects not only belongs to the field of applied research, but also can enrich the basic theory and technology of pumps, making it easier to produce results.
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