Numerical simulations have been performed to investigate the supercooled water droplet trajectories and ice accretion in a fan rotor blade under part load conditions. An Eulerian-Lagrangian approach is used in formulating the flow and droplet governing equations in the rotating reference frame. A one-way interaction model is used to model the effects of momentum and energy exchange effects with the flow on the droplets as they travel through the rotor. Simulation results are presented for the flow field at 60%, 70%, 80%, 90%, and 100% design rotational speeds. Results showing the droplet trajectory paths and collection efficiency contours at part load conditions highlight the influence of engine speed and blade geometry. A heat transfer analysis shows the effect of speed on droplet temperature rise. Based on the impingement statistics and computed flow characteristics, a quasi-3D analysis of the ice accretion over the rotor blade is also conducted using the code LEWICE. Results are presented for the ice shape variation along the span and rotor speeds. It was found that the accreted ice mass and shape is highly dependent on rotor speed and local flow velocity.

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