Pages 337-338
Detailed aerodynamic characteristics and near field flow structures of delta wings with aspect ratios λ=1.28∿4 at angles of attack α=0∿90° have been presented. In high angle of attack regions near α_C_L_<max>, flow details for small λ, (1.28∿2), are mostly similar to each other, which leads to the similar values of α_C_L_<max> and C_L_<max>, whereas reattached flow regions for aspect ratios (2.4∿4) are severely affected by λ, then α_C_L_<max> and C_L_<max> decreases with and increase in λ. In full-stalled regions (α>50deg.), entirely separated flows appear all over the suction surfaces irrespective of λ, then C_L and C_D can be represented by sinα and cosα of the (C_D)_<α=90>. In intermediate regions between them, highly unsteady natures, in which longitudinal and ring-type vortices are alternatively formed, then aerodynamics are changed with α corresponding to the fraction ratio of the both vortex types.
