Regularities for the pitching moment coefficient for a conical-spherical body in self-induced oscillation regime at Mach number М = 1.75
N.P. Adamov, E.A. Chasovnikov
Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
Keywords: cone, self-induced oscillation, oscillation amplitude, pitching moment coefficient, equivalent coefficient of pitch damping
Abstract
The processing of experimental dependences for pitching vs. time curve for free oscillations of a cone with the attached hemisphere rear part gives the pitching moment coefficients, equivalent coefficients for pitch damping, spectral coefficients for pitching angle and pitching moment coefficient for self-induced oscillations flow mode. It was shown that a dependency of pitch damping vs. oscillation amplitude presents a hyperbolic behavior. The frequency spectrum for pitching and pitching moment coefficient demonstrates a domination of one frequency. There is no hysteresis in a dependency of the pitching moment on the attack angle for self-induced oscillations.
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