Aerodynamic Studies over a Maneuvering UCAV 1303 Configuration

摘要

The flow past and loads on an unmanned combat air vehicle (UCAV) 1303 was investigated in a water tunnel. The UCAV 1303 is characterized by a non-slender, 47-deg swept-leading-edge delta wing, with a cranked trailing edge, a cropped wing tip and a fuselage. It has no vertical tail. Dye visualization and a five-axis strain gage load data were obtained for both steady and unsteady flows, from which body axis force and moment data were derived. Comparison of the flow with slender delta wings showed a number of remarkable differences such as the presence of two like-sense vortices on the same side of the wing, their simultaneous spiral and bubble bursting; as well as some similarities with the slender delta wing behavior. This paper discusses these and also compares the steady flow and unsteady flow results.