Theoretical Study On Dynamic Characteristics Of Large Low-Head Pumping Stations During Suspending Period

Many of the large pumping stations built and to-be-built in China are low-lift pumping stations.Dynamic characteristics during suspending period is an important running characteristics of large low-lift pumping stations. But the research about the characteristics is very little, and it can not fit the demands that have been presented in the actual projects. In order to sum up the experience in the design of such pumping stations, and ensure the safe and reliable operation of pumping stations, it is necessary to make theoretical studies on the transient process during the suspending period. It has important significance to probe and master in theory the dynamic characteristic during suspending period in improving the pumping stations designing, reducing the investment and ensuring the safe and reliable operation of pumping systems.-In this paper, a theoretical study was made on the dynamic characteristics of a large low-lift pumping system within suspending period. Three mathematical models are presented to express the characteristics based on the systematical analysis of mechanical, hydraulic and fluid dynamic characteristics during three transient process, and numerical calculation methods are carried out to the three mathematical models. With the rigid water hummer theory and hydraulic characteristics, this paper has improved the boundary condition equation at pump during the suspending period, and drew a simplified mathematical model. In the end , the models this paper has established are perfectly confirm to the data from actual condition. All mathematical methods can be used for reference in the design and operation of large low-head pumping stations.