Onset of unsteadiness in aero-engine intakes at incidence
AIAA SciTech Forum - 55th AIAA Aerospace Sciences Meeting
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Coschignano, A., Babinsky, H., Sheaf, C., & Platt, E. (2017). Onset of unsteadiness in aero-engine intakes at incidence. AIAA SciTech Forum - 55th AIAA Aerospace Sciences Meeting https://doi.org/10.2514/6.2017-1435
© 2017 by Andrea Coschignano. The flow field around a transonic engine inlet lip at high incidence is investigated for a variety of flow conditions around the design point. Generally, the flow on the upper surface of the lip is characterised by a supersonic region, terminated by a near-normal shock wave. At the nominal design point, the shock is not strong enough to cause significant flow separation for each of the shapes investigated. Off-design conditions were explored by altering the angle of attack as well as changing the mass flow rate over the upper lip, intended to mimic a greater mass flow demand by a turbofan engine. The results suggest that angle of attack is the dominant parameter, where an even relatively small increase of 2° can lead to large and highly unsteady flow separation with an associated shock oscillation. This is a consequence of the significantly stronger shock compared to the on design case. Both qualitative and quantitative measurements suggest a noticeably reduced aerodynamic performance resulting from higher incidence operation. In contrast, an increase of up to 5.2% in mass flow did not result in large separated regions or flow field unsteadiness. Hflowever, a trend of increasing separation with greater mass flow was observed.
External DOI: https://doi.org/10.2514/6.2017-1435
This record's URL: https://www.repository.cam.ac.uk/handle/1810/290032