Abstract
Oil film method was applied to two types of hydraulic machines;
(a) a pump-turbine, and (b) a high head submersible multistage-pump.
In case (a), the flow near the cone and crown surfaces were studied, using the measurements of static pressure together. The purpose was to determine the appropriate location of a balance hole exit, which greatly affects the thrust characteristics. In case (b), the flow at the return guide vane was studied to improve the efficiency of the pump. The oil film method was very useful to get the information for improving the characteristics of hydraulic machines, in above cases.
