Study on the Characteristics of Two-Phase Flow in Turbine Based on Roughness

Ultra-supercritical steam turbines have the characteristics of large capacity and high efficiency, but the erosion problem caused by iron oxide particles falling off steam pipeline wall is aggravated, especially for the regulating stage blades. In this paper, the characteristics of two-phase flow in regulating stage are analyzed, and the effects of particle size, particle impact velocity and impact angle on the erosion are studied in detail. At the same time, the local roughness is set to analyze the further influence of erosion damage on the two-phase flow characteristics.