Measurements of Unsteady Pressure Distributions and Dynamic Deformations on an SST Elastic Arrow-Wing Model

Unsteady pressure distributions were measured in a series of experiments for a double swept-back SST arrowwing model in the transonic regime. The wing is an elastic model whose first natural frequency is 9.79Hz. Forty-six unsteady pressure transducers and 45 pressure taps were embedded in two semi-span lines and sensed unsteady and steady pressure distributions, respectively. Dynamic deformation data of the wing model were acquired by means of optical fibers and CCD cameras. The flow field around the model was excited by a trailing edge flap which was oscilluted around a mean deflection angle in a frequency range of up to 30Hz. Unsteady lift and moment coefficients were derived from unsteady pressure distributions. In this paper, not only pressure distributions but also aerodynamic coefficients induced by the flap oscillation are characterized relating to the dynamic deformations.