Numerical study of inlet Reynolds number in fine particles deposition processes in a flue gas turbine

In this study, the effect of Reynolds number on deposition in a flue gas turbine is numerically investigated by conducting a study on flow channels between stator blades and rotating blades. The turbulence flow is modeled by the Renormalization-group (RNG) k-ε model, and particle motions are simulated by the discrete particle model (DPM) with User Defined Function (UDF). Numerical investigation is conducted for particles in the size of dp < 10.78 μm. These results show that inlet Reynolds number helps deposition develop except the pressure side of the stator blade. The pressure drop Δp, temperature drop ΔT and velocity improvement Δv increase with the increase of Re. Deposition morphologies on the blades are notably different depending on particle size. Smaller particles of dp < 3 μm settle down on the blades at a 10 or even 109 times rate of larger particles. The main areas of deposition include the suction surface of stator blades, the pressure surface of rotating blades and the zone near the hub and casing on the suction surface of rotating blades.