Formation of a transonic region in a variable-section channel for different stagnation temperatures of the flow
V.P. Zamuraev, A.P. Kalinina
Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
Keywords: re-entry vehicle model, free oscillations, pitching moment coefficient, aerodynamic characteristics, aerodynamic damping
Abstract
A method for treating experimental data obtained on a setup with free oscillations over the pitching angle of the model and for determining the unsteady aerodynamic characteristics of the pitching moment coefficient is described. It is found that the pitching moment coefficient of a re-entry vehicle model at Mach numbers M = 2 and 2.25 and fixed angles of attack a depends non-linearly on the rate of change of the angle a . This circumstance makes the concept of aerodynamic derivatives inappropriate for mathematical description of the pitching moment coefficient.
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