The Effects of the Planform Shape on Drag Polar Curves of Wings: FSI Analysis Results

This presentation discusses the preliminary results obtained from the aeroelastic analyses of two half-wing models, with a curved and a swept planform. This work was carried out by the Aerospace Section of the Department of Civil and Industrial Engineering of Pisa University.

As demonstrated in previous papers on the topic of rigid models of wings, the curved planform causes a variable angle of sweep along the wing span, resulting in a greatly reduced wave drag at transonic flight conditions.

The present numerical comparisons between a curved and traditional swept wing (with the same aspect ratio) include the effects of the structure’s flexibility. The effects of the planform shape on drag polar curves are investigated and results indicate that for fixed values of lift coefficient (CL), the reduction of drag coefficient (CD) coefficient reaches 7%-10%. In addition, using STAR-CCM+ and Abaqus Co-simulation for simulating aeroelastic effects, it was determined that the curved planform configuration improves the wing’s aeroelastic behavior. As an example, using similar wing box metallic structures for the two half-wing models, for a fixed value of CL, the reaction moments and stress values at the root of the curved wing are reduced by about 5-10% with respect to the data obtained for the traditional swept wing at the same flight conditions.

Matteo Ciabattari
Speaker Company: 
University of Pisa