ON THE PERFORMANCE OF A CASCADE OF TURBINE ROTOR TIP SECTION BLADING IN NUCLEATING STEAM .1. SURFACE PRESSURE DISTRIBUTIONS

During the course of expansion in turbines, steam first supercools and then nucleates to become a two-phase mixture. Formation and subsequen t behaviour of the liquid lower the performance of turbine wet stages. To reproduce turbine nucleating and wet flow conditions requires a su pply of supercooled steam which can be achieved under blow-down condit ions by the equipment employed. The performance of a cascade of rotor tip section blading in nucleating steam has been studied. The results of the surface pressure measurements are described in the paper.