Investigation of the effect of air flow velocity on the aerodynamic drag of the suspension system in the wind

The systematic error in measuring aerodynamic drag in the T-102 wind tunnel of TsAGI, associated with the influence of Reynolds number changes on the inherent aerodynamic drag of the strap suspension, is examined. This error was detected at the transition to relatively low air flow velocities (V =10 ... 30 m/s) during load tests. It results in an error in determining the drag coefficient, the value of which increases with the reduction of the overall dimensions of the studied aerodynamic models. The correction value to the results of experimental studies with various mounting options of models was determined, which allowed to increase the accuracy of measurements of aerodynamic characteristics at low air flow speeds.