Abstract
Exploiting the unique ability of the European Transonic Windtunnel to vary the free-stream dynamic pressure at constant Reynolds number (and vice versa), the effective aerodynamic wing twist is determined by comparing the normalized pressures measured at certain wing sections. This task is performed by a computer program which processes the pressures of one individual wing section that have been acquired at the same Mach and Reynolds number, but different levels of tunnel pressure and temperature, i.e. different dynamic pressures. To obtain the geometric twist, the induced downwash angle which originates from the effective wing twist alone is estimated and added to the effective wing twist. This paper describes the effect of the wing twist on the measurement results, the mathematical model used to determine the effective aerodynamic twist and the features of the above mentioned software. The relationship between wing bending and twist in the case of a swept wing and its impact on the results is discussed as well as the computation of the geometric wing twist. The last section contains an assessment of the accuracy and the description of the advantages and disadvantages of the presented method.
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