小型遠心ポンプの円板摩擦損失に関する研究

抄録

Pumps are widely used in the industrial field and are expected to be applied to the fuel cells, medical devices and electrical devices in recent years. The two types of centrifugal pumps that are the subject of this research have the same specific speed as general centrifugal pumps. Conventionally, the disc friction loss is not important in the centrifugal pump in this specific speed range, but this pump is characterized by its small size and open type. Therefore, it is expected that the effect of disc friction loss on performance will change compared to the conventional centrifugal pump in the same specific speed range. Then, the purpose of this research is to focus on the disc friction loss of these two types of centrifugal pumps and to seek a method for reducing them. Eventually, I would like to establish the method for reducing disc friction loss that can be used for centrifugal pumps in the low specific speed region with a specific speed of 100 or less. In this paper, for two types of centrifugal pumps, I created the model of only the back shroud without blades of each pump. For the model, I performed Computational Fluid Dynamics to calculate the ratio of disk friction loss power to shaft power and to investigate the internal flow.