F. Bakhtar et al., ON THE PERFORMANCE OF A CASCADE OF TURBINE ROTOR TIP SECTION BLADING IN WET STEAM .2. SURFACE PRESSURE DISTRIBUTIONS, Proceedings of the Institution of Mechanical Engineers. Part C, Journal of mechanical engineering science, 211(7), 1997, pp. 531-540
In the course of expansion in turbines steam nucleates to become a two
-phase mixture, the liquid consisting of a very large number of extrem
ely small droplets carried by the vapour. Formation and subsequent beh
aviour of the liquid lowers the performance of turbine wet stages. To
produce turbine nucleating and wet flow conditions realistically requi
res a supply of supercooled steam which can be achieved under blow-dow
n conditions by the equipment employed. To obtain wet steam, the super
cooled vapour generated is passed through a venturi before admission t
o the cascade. To evaluate the influence of droplet size two separate
venturis have been used in the investigation. The performance of a cas
cade of rotor tip section blading in wet steam has been studied. This
paper is the second of a set and describes the results of the surface
pressure measurements.