A METHOD FOR DETERMINING THE AERODYNAMIC ROLL DAMPING OF BLUNT BODIES AT SUPERSONIC SPEEDS
N. P. Adamov, E. A. Chasovnikov
Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
Keywords: free circular rotation setup, segmental-conical body, roll moment, viscous friction moment, equivalent aerodynamic roll damping coefficient
Abstract
An experimental setup for free circular rotation of blunt bodies about their longitudinal axis is described. A procedure for determining the roll moment in wind tunnel tests is presented. A method for determining the equivalent aerodynamic roll damping coefficient is developed, based on the fact that the viscous friction moment component in rolling bearings is independent of the axial load. For a segmental-conical body, the experimental value of the coefficient is shown to be close to the value calculated by numerical integration of the continuum equations in a quasi-stationary approximation. The proposed method can be used to determine the roll damping moment of reentry vehicles, which is necessary for solving flight dynamics problems.
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