Numerical research on rain field intensity and uniformity of a high-velocity rain wind tunnel

Abstract Rain field intensity and uniformity are essential to high-velocity rain wind tunnels. This paper investigated the rain field of a high-velocity rain wind tunnel via a two-way coupled Eulerian-Lagrangian approach. The simulation results show that the spray diffusion degree is mainly affected by air velocity, followed by the initial particle velocity. The intensity of the rain field increases with the growth of the nozzle flow rate and the increase of the air velocity, while the uniformity of the rain field is mainly affected by the air velocity. Under the same air velocity and nozzle flow rate, the farther away from the outlet, the lower the rain field intensity, while the uniformity of the rain field displays the tendency to rise initially and then decline.