Experimental Studies of Liquid Film Suction from Turbine Stator Blade Surface in Wet Steam Flow

Authors

V.G. Gribin - Department of Steam and Gas turbine, Moscow Power Engineering Institute National, Research University, Russia
A.A. Tishchenko - Department of Steam and Gas turbine, Moscow Power Engineering Institute National, Research University, Russia
I.Y. Gavrilov - Department of Steam and Gas turbine, Moscow Power Engineering Institute National, Research University, Russia
S.V. Khomyakov - Department of Steam and Gas turbine, Moscow Power Engineering Institute National, Research University, Russia
V.V. Popov - Department of Steam and Gas turbine, Moscow Power Engineering Institute National, Research University, Russia
V.A. Tishchenko - Department of Steam and Gas turbine, Moscow Power Engineering Institute National, Research University, Russia
I.Y. Sorokin - Department of Steam and Gas turbine, Moscow Power Engineering Institute National, Research University, Russia

Abstract

This paper presents the results of experimental analysis of wet steam flow with liquid film suction process from the surfaces of hollow stator blades. The influence of intrachannel water separation on liquid phase parameters downstream the flat stator blade cascade has been discussed. The investigations were performed at the experimental installation Wet Steam Circuit-1 (WSC). The experiments were performed at initial wetness of the steam y0 = 6.5% and theoretical exit Mach number M1t = 0.6. In the studied channel there are 2 suction slots on each blade. They are made at angle 90o to generatrix of blade profile. Isolated from each other slots are situated on the blade pressure side. The effects of pressure drop in slots on wet steam flow downstream the nozzle blade cascade has been studied. The mass flow rate of liquid phase for each slot has been measured. Velocity fields of liquid phase downstream the nozzle blade cascade were obtained by the particle image velocimetry (PIV) method. The results of experimental study allow modifying the operating variables of intrachannel moisture separation systems for steam turbines stages.