Non-spherical Particle Trajectory Modelling for Ice Crystal Conditions 2019-01-1961
Aircraft icing is a significant issue for aviation safety. We use recent developments for calculating the drag, lift and torque correlations for four specific particle shapes to determine the trajectory, rotation and impingement of ice particles in aircraft icing scenarios. Previously, within the range of Reynolds number permitted in this study, it was only possible to model the trajectory and rotational progression of cylindrical particles. The work presented in this paper allows for analysis of a wider range of ice shapes that are commonly seen in icing conditions, capturing the dynamics and behaviours specific to these particles. Previous limitations relating to the dependency of drag, lift and torque coefficients on the measure of sphericity are overcome. The method provides an opportunity for new analysis. As seen through our analysis, taking the worst and best case scenarios provides a range of values for the catch, which can help to understand the extent to which particles impinge and where. Hence a catch-limit for a mixed cloud of particles of different shaped particles and different sized particles may be easily gained. The method is also able to capture rotations and trajectories in three dimensions. Incorporating new methods for modelling the trajectory, rotation and orientation of non-spherical particles into the modelling of aircraft icing opens new avenues for industrial analysis. In turn this may aide several areas of aircraft design related to engine design and anti-icing/de-icing system design as well as informing the aircraft certification process and requirements.
Ryan Palmer, Ian Roberts, Richard Moser, Colin Hatch, Frank Smith
University College London, Aerotex UK, AeroTex UK
International Conference on Icing of Aircraft, Engines, and Structures