Abstract:
To meet the ever-increasing demand for advanced civil aircraft with higher cruising Mach number and better aerodynamic performance, the Chinese Aeronautical Establishment proposed the model CAE-AVM with a cruising Mach number of 0.85, a cruising lift coefficient of 0.5, and an aspect ratio of 9.0. The aerodynamic performance of CAE-AVM was tested in German-Dutch Wind Tunnels (DNW) in 2013 and 2018, with the Mach number ranging from 0.2 to 0.9 and the Reynolds numbers 3×10
6 and 4.7×10
6. The model information, measurement methods, test results and aerodynamic performance are systematically introduced in this paper. In the natural transition experiment, the minimum drag coefficient is about 23 counts less than that under fixed transition. The deformation of the wingtip torsion angle in the cruise state is about −0.95°. Refined experimental studies should conduct synchronous force, pressure, and deformation measurements, together with infrared observation. Meanwhile, the influence of fluorescent markers for deformation measurement on aerodynamic performance needs to be quantified further. Moreover, it would be preferable to carry out numerical simulations considering the interference of support and the model elastic deformation prior to wind tunnel tests. The two wind tunnel tests have good repeatability, and the model can maintain stable aerodynamic characteristics in a wide range of Mach numbers, satisfying the requirements of aerodynamic validation models for future advanced civil aircraft.