## 03.3 - Basic Fluid Dynamics and Flow Control## EXPERIMENTAL INVESTIGATION, MATHEMATICAL AND NUMERICAL SIMULATION OF AIRCRAFT ICING PHENOMENA
A review of the results concerning an aircraft icing process, obtained by TsAGI scientific team is presented.rnIt was shown theoretically that aerodynamic deformation of large supercooled droplets influences significantly on the collection efficiency of a wing due to augmentation of the drag force. The role of water crystals orientation is investigated in non-symmetrical impingement upon even a symmetrical body. The correspondent numerical analysis was developed for small Reynolds numbers (especially in microaviation application) as well as for large those, on the basis of the spheroid model of crystal.rnAn heuristic model of the velocity recovery coefficients, based on a multitude of the experimental data, is derived, which takes into account physical properties of the solid particle and impinged body (elastic moduli, Poisson coefficients, mass densities) and the flight conditions (impact velocity, sliding angle, etc.)rnA new physic-mathematical model of an ice crystal collision upon a surface is suggested, which describes the influence of a tangential force on the crystal destruction (in addition to usually taken normal forces). In this case, corresponding numerical investigations have revealed two-horn icing mode on the cylinder in the two phase cross flow.rnThermal stresses in the ice slab on the leading edge of a wing, which arise due to release of crystallization latent heat, are investigated. As it was shown, the magnitude of the stress tensor components may destroy the ice slab, at the certain flight conditions.rnSome new modifications of our ground-based facility [1] aimed for the icing physics simulation are fulfilled. rnThe qualification characteristics of supercooled drops ice crystal-air flow (especially, radial distribution of the particulate concentration) are investigated and developed theoretically [2] and experimentally [1, 3]. Original algorithms were p |