Study on water extraction of hollow stationary blade under wet steam flow conditions

Abstract

Numerical simulation and experimental investigation on water extraction of hollow stationary blade are presented under wet steam flow conditions. The deposition of fog and coarse droplets on a last-stage stationary blade is investigated based on the numerical simulations of multistage non-equilibrium condensation flow in a nuclear low-pressure cylinder. It indicates that the majority of depositional droplets are deposited in the front of suction surface, and a small quantity of droplets are deposited on the casing and in the rear of pressure surface. The water extraction performance of the suction slots on hollow stationary blade is measured on a wet steam test rig. A series of scaled blades are testing under different outlet Mach number and suction pressure difference, where the position, width and shape of slot are altered respectively. The rounded inlet corner of suction slot is preferred and the optimal slot width maybe is about 1mm.