Full-Configuration Drag Estimation

摘要

Accurate drag estimation is critical in making computational design studies. Dragmay be estimated thousands ofntimes during a multidisciplinary design optimization, and computational fluid dynamics is not yet possible in thesenstudies. The current model has been developed as part of an air-vehicle conceptual-design multidisciplinary designnoptimization framework. Its use for subsonic and transonic aircraft configurations is presented and validated. Wenpresent our parametric geometry definition, followed by the drag model description. The drag model includesninduced, friction, wave, and interference drag. The model is compared with subsonic and transonic isolated wings,nand a wing/body configuration used previously in drag prediction workshops. The agreement between thenpredictions of the drag model and test data is good, but lessens at high lift coefficients and high transonic Machnnumbers. In some cases the accuracy of this drag estimation method exceeds much more elaborate analyses.