Investigation on the correlation of high-speed force test results of flying-wing calibration model with low-aspect ratio

In order to investigate the correlation of force test results of flying-wing calibration model with low-aspect ratio and analyze the precision level of wind tunnel experiments in different wind tunnels, repeated tests and comparison tests on the flying-wing calibration model are conducted in three different wind tunnels based on a same balance and a set of stings with the same geometry. Test results indicate that the flow characteristics have huge influent on the correlation relations and the precision levels of the three wind tunnel test data. At small angels of attack when attached flow is dominant, the correlation of test data is good and the precision is high enough. However, as angles of attack increase and the leading-edge vortex will breakdown, both the correlation and the precision may fall down. Due to the complex flow characteristics at transonic flow, both correlation and precision are worse than that of supersonic flow. The main differences between test data of the three wind tunnels lie in the angle of attack of inflexion of the lift curve, zero-lift drag coefficient and zero-lift angle of attack.