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  1. No Access

    Chapter and Conference Paper

    Wall Pressure Signature in Compressible Turbulent Boundary Layers

    Large-scale turbulent flow structures associated with positive and negative wall pressure fluctuations in a compressible turbulent boundary layer are investigated. Experiments are conducted in a closed-loop tr...

    N. A. Buchmann, Y. C. Kücükosman, K. Ehrenfried in Progress in Wall Turbulence 2 (2016)

  2. Article

    Recording and evaluation methods of PIV investigations on a helicopter rotor model

    M. Raffel, H. Richard, K. Ehrenfried, B. Van der Wall, C. Burley in Experiments in Fluids (2006)

  3. No Access

    Article

    Recording and evaluation methods of PIV investigations on a helicopter rotor model

    Three-component particle image velocimetry measurements at moderate speeds and observation distances can now be accomplished on a routine basis. This article discusses the experiment performed on a 4 m-diamete...

    M. Raffel, H. Richard, K. Ehrenfried, B. Van der Wall, C. Burley in Experiments in Fluids (2004)

  4. No Access

    Article

    Particle image velocimetry in aerodynamics: Technology and applications in wind tunnels

    Particle image velocimetry (PIV) is increasingly used for aerodynamic research and development. The PIV technique allows the recording of a complete flow velocity field in a plane of the flow within a few micr...

    J. Kompenhans, M. Raffel, L. Dieterle, T. Dewhirst, H. Vollmers in Journal of Visualization (2000)

  5. No Access

    Chapter and Conference Paper

    Vortex Dynamics in Nonuniform Compressible Flow

    The convection of vortices in convergent nozzles and Laval nozzles is investigated experimentally and numerically. All studies are done for the plane case. The experiments are performed in a transonic wind tun...

    K. Ehrenfried, G. E. A. Meier in IUTAM Symposium on Dynamics of Slender Vortices (1998)

  6. No Access

    Chapter and Conference Paper

    Wave Models for Unsteady Separation and Jets

    The unsteady behaviour of separation and jets is explained in terms of the propagation and amplification of waves. The formation of waves on the boundaries of separation and jets is often caused by an instabil...

    G. E. A. Meier, K. Ehrenfried, G. Grabitz, M. Rein in Separated Flows and Jets (1991)