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 v ortex 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.