The main flow parameters characterising the liquid film suction process on the blade surface in a steam turbine

Abstract

Abstract In this study, the process of liquid film suction from surfaces of steam blades is considered. The main goal of the investigation is to provide the list of nondimensional parameters characterizing this phenomenon. The complex nature of this process requires the consideration of various flow features occurring with the film. The influence of slot geometry, flow conditions and suction regimes are studied. As a result, the processes of film separation, transient breakup and interphase interaction are considered. Based on the obtained information, the set of nondimensional parameters is formulated. Their accounting will allow conducting correct research in laboratory conditions to transfer its results to a real turbine. The numerical modelling is performed to verify the findings, and the regime for the experimental rig providing the same non-dimensional parameters as for real turbine is selected.