Inflight icing and ice shedding as an important problem in the aviation industry have been studying in recent decades both experimentally and numerically. In recent years, the numerical approach has been privileged to simulate ice accretion and ice piece trajectory due to its cost and time efficiency. This study aims to investigate the influence of the different characters of the ice piece and airfoil on the probability of ice ingestion by an aft-mounted engine. In this order, the flow field of the Joukowski airfoil and 2D trajectory of a square plate ice piece in this flow field will be simulated.
Velocity field of Joukowski airfoil is simulated and used to compute aerodynamic forces on the square plate ice piece. Trajectories for square plate ice particles in uniform flow fields are compared with the literature to validate the developed code. As the ice shedding is associated with uncertainties regarding its initial conditions, Monte-Carlo method is used to have a statistical study on this phenomenon. Ice pass probability map around the airfoil is generated to investigate the influence of airfoils’ parameters such as thickness, camber and angle of attack as well as the influence of ice’s shape and mass on the trajectory of the ice piece. Ice shedding is investigated separately for upside and downside of the leading edge.
Initial condition of ice shedding is found to be an important factor in ice trajectories. Results show that ice ingestion probability by engine changes for different set of parameters of airfoil and ice piece. Thicker and more curved airfoils impose less ice ingestion risk. Airfoil’s angle of attack has different influence on the probability map depending on the location of the ice shedding. Rectangular and sphere ice particles are more likely than square ice pieces to pass through the engine. Also it is shown that Magnus effect has an important influence on the ice trajectories which cannot be ignored in ice trajectory simulations.
| Date | 27 Mar 2018 |
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| Original language | American English |
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| Awarding Institution | - École de technologie supérieure
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| Supervisor | François Morency (Supervisor) |
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Kamousi Alamdari, M. (Author),
Morency (Supervisor),
27 Mar 2018Student thesis: Master's thesis › Master in Engineering: Mechanical Engineering