Some Experimental Results of Subsonic Derivative Obtained in the T-38 Wind Tunnel by Forced Oscillation
Marija Samardžić,
Zoran Anastasijević,
Dragan Marinkoviski
The results of an experimental determination of the subsonic direct damping derivative in roll are presented. The method applied in the T-38 wind tunnel is the rigidly forced oscillation technique [1-4]. The wind tunnel tests were conducted on two missile models: a Modified Basic Finner Model (MBFM), and a missile model developed in the VTI (BUMBAR) [5,8]. The tests were made at Mach number 0.6 for the MBFM model, and at Mach numbers 0.2, 0.4, 0.6 for the BUMBAR model. The obtained test results are compared with theoretical values for roll-damping coefficients obtained by the “DMAC” semi-empirical method [6] and for the MBFM model with results obtained in the AEDC wind tunnel [7].
Key words: wind tunnel, experimental aerodynamics, aerodynamic derivatives, stability derivatives, subsonic flow, forced oscillation.