Abstract
It is very important to study about the inner flow of rotating impeller of hydraulic machine as pump etc. for the improvement of it's characteristics. Up to now, there are some examples of the flow visualization for the centrifugal pump of water, but is none for the pump of oil.
For the centrifugal pumps designed for water, its sphere of use are spreaded and it became to use for the transportation of the high viscosity fluid as oil. But in this case, the characteristic of pump become lower for the increasing of viscosity. So, it became important to increase the efficiency of it by studying of growing eddy and separation etc. in the inner flow.
In this study, the inner flow of centrifugal pump for oil was observed using Tuft method and the characteristics of it was made clear and the data for improvement of characteristic was obtained.
