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Role of secondary shear-layer vortices in the development of flow asymmetry on a cone–cylinder body at high angles of incidence

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Abstract

Vortex asymmetry develops on slender bodies at high angles of incidence, leading to large side-forces and yaw moments even in symmetrical flight conditions. In the present experimental study, the flow over a slender body consisting of a conical forebody and a cylindrical aftbody is studied at high angles of incidence at low speeds. Experiments consisted of force measurements using a six-component strain gauge balance and velocity field using Particle Image Velocimetry. Results show that a pair of counter-rotating vortices develop nearly symmetrically over a polished cone but become asymmetric over the cylinder. Several secondary shear-layer vortices develop at the cone–cylinder junction and over the cylinder due to sharp turning angle, surface imperfections, and joints. These secondary shear-layer vortices then merge with the primary vortex pair, leading to the flow asymmetry. The flow characteristics and side-forces vary significantly when the conical forebody is rotated about its axis of symmetry and set to different azimuthal positions. The results strongly suggest that a change in the geometry at the cone–cylinder junction and surface imperfections present on the cylindrical aftbody play an important role in determining the overall flow-asymmetry and the magnitude of side-forces generated on the slender body at high angles of incidence.

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Acknowledgements

The authors would like to thank the U.S. Army Research Office for their financial support under contract W911NF-15-1-0583 managed by Dr. Matthew Munson. We are grateful for their support. The machining assistance of FCAAP machinist, Mr. Jeremy Phillips, as well as the assistance of the wind tunnel engineers Mr. John Strike and Mr. Alex Karns in design and test execution, is also gratefully acknowledged.

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Authors and Affiliations

  1. Florida Center for Advanced Aero-Propulsion (FCAAP), FAMU-FSU College of Engineering, Tallahassee, FL, 32310, USA

    Roopesh Kumar, Tufan Kumar Guha & Rajan Kumar

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  1. Roopesh Kumar
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  2. Tufan Kumar Guha
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  3. Rajan Kumar
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Correspondence to Rajan Kumar.

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Kumar, R., Guha, T.K. & Kumar, R. Role of secondary shear-layer vortices in the development of flow asymmetry on a cone–cylinder body at high angles of incidence. Exp Fluids 61, 215 (2020). https://doi.org/10.1007/s00348-020-03045-y

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  • DOI: https://doi.org/10.1007/s00348-020-03045-y

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