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Selected Flow Problems of Small Aspect-Ratio Delta-Type Wings

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Separated and Vortical Flow in Aircraft Wing Aerodynamics

Abstract

The main topic of this book are the basics of separated and vortical flow in aircraft wing aerodynamics.

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Notes

  1. 1.

    Vortex breakdown is also denoted as vortex bursting.

  2. 2.

    The suction-pressure concept goes back to the application of circulation theory (Model 4). Consider an airfoil at angle of attack. The only force is the lift force L, normal to the freestream direction. Its component in x-direction of the airfoil is \(P_x =\) \(-\) \(L\) \(\,sin\alpha =\) S, i.e., the suction force, which is forward directed [9]. It is attributed to the low pressure—the suction pressure—due to the flow around the leading edge of the airfoil, which is a high-speed flow. The higher the angle of attack, the larger is S. In our context it regards the flow around the swept leading edges of delta wings and the resulting non-linear lift due to the lee-side vortex system.

  3. 3.

    The specific excess power is the power surplus needed/available for the acceleration of the flight vehicle or for its climbing performance.

  4. 4.

    We note that detailed investigations of the ensuing flow changes with discrete numerical methods (Model 10 and 11 of Table 1.3) would be desirable, at least from an academic point of view.

  5. 5.

    Note that at the lower (windward) side the primary attachment line always is assumed to be located at the middle of the wing, see the discussion in Sects. 7.4.3 and 7.5. Note further that focus points are nodal points and therefore denoted with N, instead of F, as for instance in Sect. 7.4.3.

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Authors and Affiliations

  1. Institute of Aerodynamics and Gasdynamics, University Stuttgart, Zorneding, Germany

    Ernst Heinrich Hirschel

  2. Department of Aeronautical and Vehicle Engineering, Royal Institute of Technology, Stockholm, Sweden

    Arthur Rizzi

  3. Chair of Aerodynamics and Fluid Mechanics, Technical University of Munich, Munich, Germany

    Christian Breitsamter

  4. Institute of Flightsystems, Bundeswehr University Munich, Zorneding, Germany

    Werner Staudacher

Authors
  1. Ernst Heinrich Hirschel
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  2. Arthur Rizzi
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  3. Christian Breitsamter
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  4. Werner Staudacher
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Correspondence to Ernst Heinrich Hirschel .

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Hirschel, E.H., Rizzi, A., Breitsamter, C., Staudacher, W. (2021). Selected Flow Problems of Small Aspect-Ratio Delta-Type Wings. In: Separated and Vortical Flow in Aircraft Wing Aerodynamics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-61328-3_11

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