Supercooled Water Droplet Impingement and Icing Region Prediction on a Rotating Fan Blade

摘要

Ice accretion on the aero-engine fan degrades the engine performance and even causes accidents, and the physical processes involved in ice accumulation on the rotating blade are complex and challenging. So developing high accuracy numerical method and simulating the icing process on the rotating fan blade is necessary and worth studying. In the present study, the flow field of transonic fan rotor67 was simulated and water impingement characteristic was obtained with ANSYS Fluent by the Eulerian approach. The impact region and collection efficiency of different median volume diameters were compared and analyzed. The heat transfer between air and water droplet was also considered to obtain the impingement temperature of water droplets. Results showed that the water droplet temperature in some regions exceeds the freezing point and icing will not occur in these regions. Combining the impingement region, droplet temperature, wall temperature and evaporating rate on the blade surface, the pressure side of the blade is divided into four parts. Features of these regions were analyzed and possible icing area was presented. The method proposed herein is suitable for the icing prediction of high speed rotating axial fans and provides guidance for further research.