HOMER - Holistic Optical Metrology for Aero-Elastic Research

Within the European project “Holistic Optical Metrology for Aero-Elastic Research” (HOMER), the unsteady flow phenomenon shock buffet is investigated at the Trisonic wind tunnel Munich (TWM) for a fixed Reynolds number of  3x106 and several combinations of transonic Mach number (M) and angle of attack (alpha). The shock front locations, the model’s motion and deformation, the velocity field around the wing model, and the qualitative pressure fields on the model’s upper surface are reconstructed by means of the optical techniques background-oriented schlieren (BOS), digital image correlation (DIC), particle image velocimetry (PIV), and pressure sensitive paint (PSP), respectively. Two different experimental campaigns are conducted. First, the 2-D wing model based on the OAT15A profile is rigidly mounted in the test section to study in detail the flow development from steady shock to developed periodic buffet. In a second campaign, the model’s pitching rigidity is significantly reduced to facilitate shock buffeting, that is the structural response to shock buffet. In particular, the effect of structural (mass ratio and pitching frequency) and aerodynamic (,) parameters on buffeting onset, frequency, and amplitude is investigated.

 

Cooperations:

  • DLR Göttingen
  • TU Delft
  • CNRS Poitiers
  • ONERA
  • LaVision GmbH
  • University of Southampton

 

Person in charge:

  • Alessandro Accorinti
  • Tim Korthäuer
  • Sven Scharnowski

 

Funding:

  • European Union’s Horizon 2020 research and innovation program under grant agreement No. 769237

 

Publications:

  • Korthäuer T, Accorinti A, Scharnowski S, Kähler CJ (2023) Experimental investigation of transonic buffeting, frequency lock-in and their dependence of structural characteristics. Journal of Fluids and Structures, Unter Begutachtung.
  • Accorinti A, Korthäuer T, Scharnowski S, Kähler CJ (2023) Characterization of transonic shock oscillations over the span of an OAT15A profile. Experiments in Fluids 64:61
  • Korthäuer T, Accorinti A, Scharnowski S, Kähler CJ (2023) Effect of mach number and pitching eigenfrequency on transonic buffet onset. AIAA Journal 61:112–124
  • Accorinti A, Korthäuer T, Scharnowski S, Kähler CJ (2023) Analysis of the flow development towards shock buffet on an OAT15A profile. In AIAA SCITECH 2023 Forum, page 244.
  • Korthäuer T, Accorinti A, Scharnowski S, Kähler CJ (2023) The effect of structural characteristics on frequency lock-in in transonic buffeting flows. In AIAA SCITECH 2023 Forum, page 1195.
  • Kokmanian K, Scharnowski S, Schäfer C, Accorinti A, Baur T, Kähler CJ (2022) Investigating the flow field dynamics of transonic shock buffet using particle image velocimetry. Experiments in Fluids 63:1–14
  • Accorinti A, Baur T, Scharnowski S, Kähler CJ (2022) Experimental investigation of transonic shock buffet on an OAT15A profile. AIAA Journal 60:6289–6300
  • Scharnowski S, Kokmanian K, Schäfer C, Baur T, Accorinti A, Kähler CJ (2022) Shock buffet analysis on a supercritical airfoil with a pitching degree of freedom. Experiments in Fluids 63:93
  • Baur T, Accorinti A, Scharnowski S, Kähler CJ (2021) Transsonische Strömungs-Struktur-Interaktion: Bestimmung der „Buffeting “-Grenzen eines superkritischen Flügelprofils mit einem Nick-Freiheitsgrad. GALA conference, Bremen, Germany, 7-9 September.
  • Accorinti A, Baur T, Scharnowski S, Knebusch J, Dillinger J, Govers Y, Nitzsche J, Kähler CJ (2021) Measurements of deformation, schlieren and forces on an OAT15A airfoil at pre-buffet and buffet conditions. In IOP Conference Series: Materials Science and Engineering, volume 1024, page 012052. IOP Publishing.