An Investigation of the effect of Freestream Turbulence on the Laminar Separation Bubble on an SD7003 Airfoil

摘要

Measurements and computations of the separation and reattachment locations are reported for the SD7003 airfoil with the chord Reynolds number in the range 2-4 xlO4. Measurements are based on multi-line Molecular Tagging Velocimetry. Comparisons of experimental results with current computations and previous experiments point to challenges involved in the experimental determination of separation bubble characteristics. Results also bring into focus the facility dependent issues, specifically freestream turbulence, that impacts the experimental data. Preliminary results indicate a downstream/upstream movement of separation/reattachment, respectively, with added freestream turbulence. This observation may explain some of the discrepancies among the various experimental and computational results.