Abstract

The development of the unsteady wake of transport aircraft under stall conditions and its impact on the empennage is challenging to predict and the flow physics is far from being understood. In the European ESWI project time-resolved PIV (TR-PIV) measurements on the separated wake of the NASA Common Research Model (CRM) were performed in the cryogenic European Transonic Windtunnel (ETW) for flight Reynolds number conditions supplemented by aerodynamic measurements for a great variety of inflow conditions. In the TR-PIV measurements both, low-speed stall (M∞ = 0.25, Re = 11.6 / 16.5M) and high-speed stall (M∞ = 0.85, Re = 19.8 / 30M) were considered and the frequency resolution was as high as 1 kHz enabling a sufficient characterization of the turbulent wake spectrum. Further hybrid RANS/LES simulations were performed for selected lowand high-speed stall conditions. In the present paper the numerical results are discussed and compared to the experiments and first evaluations of the PIV data are presented.

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