Liquid film formation: prediction accuracy of different numerical approaches

Abstract In counteracting fouling phenomenon in gas turbines, which leads to system inefficiencies and performance degradation, water washing technique is very often adopted. Water droplets sprays are injected and, hitting the solid surfaces, remove dirt deposition. Among collateral undesirable phenomena related washing, blades erosion liquid film formation most remarkable. Despite former issue was extensively assessed by authors previous works, up authors’ knowledge risk of due scarcely investigated. Liquid spreading on a surface complex involving large number physical events, such as: impact surface, splashing phenomena, dragging under effect carrier phase separation from proximity geometry discontinuities. this paper, an used experimental test case all these different numerical wall models available literature. The consists injection jet high velocity crossflow. Some mass impacts opposite generating develops A Lagrangian approach track suspended within flow field also considering turbulent dispersion means Random Walk model. Droplets-wall interaction considered according Stanton-Rutland model, provides outcome collision (deposit, rebound or splashing), depending local conditions. If droplet sticks boundary, generates. Droplets atomization accounted for using Madabhushi model while Friederich selected take into account detachment at edge. Three simulations have been performed based approaches solve evolution, namely Eulerian one-way coupling, two-way coupling coupling. Numerical results compared with ones both qualitative quantitative point view. shape, its spatial distribution variation thickness centreline between proving that 2-way better reproduces dynamics observed experiments.