Abstract: The droplet re-entrainment in Marine intake filtration components seriously affects the gas intake quality and the safe operation of gas turbines. Given the above problem, the formation and influence mechanism of the droplet re-entrainment inside the wire mesh filter were studied, and the effects of different inlet air velocities and different droplet diameters on the liquid film thickness on the surface of the mesh and the mass of re-entrained droplets were compared and analyzed. The results show that droplets at the inlet tend to deposit and form the liquid film first upstream of the mesh segment due to the velocity gradient and inertia; Liquid film stripping is the main form of reentrainment under ship driving conditions, and the critical inlet air velocity is in the range of 4~4.5 m/s. The compact arrangement of adjacent wire mesh layers accelerates the airflow, intensifies the shear effect on the film, and increases the film stripping mass, which should be avoided as far as possible in mesh processing. With the increase of the inlet air velocity, the liquid film thickness decreases on a whole, and the film stripping mass increases; The increase of droplet diameter makes the pores easy to block, and the local film thickness increases, which eventually leads to the overall decrease of film thickness and the increase of film stripping mass, which seriously affects the filtration efficiency. When d=20 μm , the filter is close to failure.

Key words: Gas turbine intake system, Wire mesh filter, Droplet re-entrainment, Liquid film distribution, Film stripping