Development of a Low Speed Wind Tunnel Test Campaign
Sammanfattning: This study was performed to investigate aerodynamic characteristics of the 37.5% scaled down Green Raven MK18 airframe, to evaluate boundary corrections method, and to investigate on support interference. A wind tunnel test was originally planned on June 2021 at a LargeLowSpeed Wind Tunnel at University of Bristol; however, due to COVID19 travel restrictions, the test has been postponed to November 2021. In order to supplement the work and data directly required for the test, computational fluid dynamics (CFD) investigations were performed in free air and in wind tunnel conditions, both with and without support interference, at a Reynolds number of 7E+05. The simulations utilized an incompressible Reynolds-Averaged-Navier.Stokes equation accompanied with k − ω SST for turbulent modelling. Corrections factors were obtained to compensate for wall interference, and results indicate a satisfactory agreement between free air and wind tunnel corrected data for wall interference. The sup port structure interferes with the aerodynamic loads produced by the model. Lift and drag decrease, and pitching moment increases compared to WT without support structure condition.
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