Research on characteristics of solid particle erosion in governing stage of a 600 MW supercritical steam turbine

Solid particle erosion (SPE) of governing stage has been proved to be great threat to steam turbine performance. Based on Eulerian-Lagrangian method and Finnie rebound model, the urgent SPE problem of high-parameter steam turbine is studied and the characteristics of SPE in governing stage of a 600 MW supercritical steam turbine were simulated and analyzed under different particle sizes and rotation speeds in this paper. Results show that the eroded area on nozzle is mainly at the mid-rear part of the pressure surface and is distributed along the radial direction from root to tip. The erosion on rotor blade appears on the leading edge, the mid-rear part of the pressure surface and the suction surface near to the leading edge. Additionally, the eroded area on rotor blade has an obviously upward trend, the radial migration of eroded area increases with the increase of rotation speed and the radial migration quantity is about 7% of blade height at 3000 rpm. The maximum erosion rate density on the rotor blade is 1.9 times of the rate on nozzle. Besides, the critical size of particle is different in nozzle and rotor blade. (C) 2017 Elsevier Ltd. All rights reserved.