One of the goals of a wind tunnel study of the European launcher Ariane IV was to establish its overall aerodynamic coefficients during the atmospheric flight phase. The initial draft of the study was done using reduced-scale models, which either did not include, or included only schematically, the rocket's actual projecting structures (gutters, flaps, antenna, stiffeners, etc.). It was then made more precise by using a model whose size allowed proper definition of the outer equipment. The effect of the protruding structures seemed greater than that observed in previous Ariane generations. In particular, the launcher's aerodynamic stability and lift seem greatly affected by surface roughnesses. In order to determine the degree of confidence to be placed in these results, the larger-scale models were retested, using different simulations of the actual outer configuration. The results are presented in the report. They show that, within the limits of the experiment, for Mach numbers between 0.8 and 3 and Reynolds numbers of 1.5 million, faithful representation of surface details is more important than variations in other aerodynamic parameters.
Essais en Soufflerie de Maquettes d'ARIANE 4 (Wind Tunnel Trials of ARIANE 4 Models)
1986
28 pages
Report
Keine Angabe
Englisch
Missile Launching & Support Systems , Test Facilities & Equipment , Aerodynamics , Wind tunnels , Missile launchers , Aerodynamic characteristics , Scale model tests , Surface roughness , Aerodynamic stability , Aerodynamic lift , Charts , Foreign technology , Ariane launch vehicle , Atmospheric flight
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