Unsteady numerical simulation of steam-solid two-phase flow in the governing stage of a steam turbine

Solid particle erosion (SPE) in an ultra-supercritical steam turbine control stage with block configuration is investigated numerically, based on the finite volume method and the fluid-particle coupling solver. We apply the particle discrete phase model to model the solid particles flow, and use the Euler conservation equations to solve the continuous phase. The investigation is focused on the influence of the solid particle parameters (such as particle diameter, particle velocity and particle trajectory) on the erosion rate of the stator and rotor blade surface in unsteady condition. The distributions of the highly eroded zone on the stator and rotor blade surfaces are shown and discussed in detail according to the mechanism of solid particle/blade wall interaction. We obtain that the erosion rate of the vane blade is sensitive to the fluctuation of the potential flow field, and the smaller particle has a greater impact on the erosion distribution of rotor blade. The erosion rate does not entirely depend on the diameter size of the solid particle.

[1]  A. Gallegos-Muñoz,et al.  Numerical investigation of the solid particle erosion rate in a steam turbine nozzle , 2007 .

[2]  William James Sumner,et al.  Reducing solid particle erosion damage in large steam turbines , 1985 .

[3]  Yiping Dai,et al.  Nozzle passage aerodynamic design to reduce solid particle erosion of a supercritical steam turbine control stage , 2007 .

[4]  Widen Tabakoff,et al.  Protection of coated superalloys from erosion in turbomachinery and other systems exposed to particulate flows , 1999 .

[5]  Siamack A. Shirazi,et al.  Improvements of Particle Near-Wall Velocity and Erosion Predictions Using a Commercial CFD Code , 2009 .

[6]  Sudip S. Dosanjh,et al.  The influence of turbulence on erosion by a particle-laden fluid jet , 1984 .

[7]  Robert W. Lyczkowski,et al.  State-of-the-art review of erosion modeling in fluid/solids systems , 2002 .

[8]  W. Tabakoff,et al.  Erosion Prediction in Turbomachinery Resulting from Environmental Solid Particles , 1975 .

[9]  Widen Tabakoff,et al.  Erosion rate testing at high temperature for turbomachinery use , 1995 .

[10]  Widen Tabakoff,et al.  Study of particle rebound characteristics and material erosion at high temperature , 1988 .

[11]  B. T. Chao,et al.  A novel radioactive particle tracking facility for measurement of solids motion in gas fluidized beds , 1985 .

[12]  Edmund F. Rybicki,et al.  Comparison of computed and measured particle velocities and erosion in water and air flows , 2007 .