High-Lift Devices for a Delta Wing Installed Around a Trailing-Edge

Three devices to improve the aerodynamic characteristics of a delta wing at low speeds and high angles of attack are computationally examined. These are two types of blowing at the trailing edge and a slotted flap. All three are commonly employed on rectangle wings. They all show favorable effects, namely, chordwise blowing increases the lift considerably. The effectiveness in strengthening the leading-edge vortex is higher for chordwise blowing than lateral blowing. It is observed that, although the jet slots are installed at a trailing edge, the blowing strengthens the leading-edge separation vortex over the delta wing. This motivated an investigation of the use of a slotted flap. The flap also increases the lift of the wing, as well as the total lift due to both the wing and the flap, but the effect on the leading-edge vortices is smaller than both types of blowing