A Design Method For Twist Distribution Along Wing Span

A design method for wing jig shape twist is proposed. Target cruising aerodynamic loads are applied to structure model, and the deformation converge gradually using predictor-correction displacement iterative method. When ensuring the relative twist distribution in the streamwise section, a wing jig shape with straight leading ledge is created, then an aeroelastic coupling iteration is started to achieve the deformed elastic cruising shape. Taking a large aspect ratio swept wing as an example, analysis results show that the deformed elastic cruising wing had an identical streamwise twist distribution compared with rigid designed cruising shape. Sectional lift distribution along with pressure distribution matches well with that of the designed cruising shape, and the drag gap among them is not significant. There might be some change in shock wave chord position between elastic cruising wing and designed cruising wing for outboard wing section. By slight adjusting twist with unchanged airfoil profile, the difference above could be improved.