21st Congress of International Council of the Aeronautical Sciences, Melbourne, Australia, 13-18 September, 1998
Paper ICAS-98-2.4.5

AERODYNAMIC CHARACTERISTICS OF AXISYMMETRIC AND THREE-DIMENSIONAL BODIES AT TRANSONIC SPEEDS

Fonarev A. S., Naida M. A.
Central Aerohydrodynamic Inst., Russia

Keywords: aerodynamic, axisymmetric,three-dimensional, transonic speeds

Theoretical study of steady and unsteady transonic flows about axisymmetric and 3D elongated bodies has been carried out within the framework of non-linear small disturbance theory. Flow unsteadiness can be caused by disturbances of different nature: abrupt changes of flow velocity, ongoing shock waves, etc. To solve the problem the domain, where the solution is sought, is divided into two regions: inner and outer. By using numerical methods the solutions for boundary value problems in both regions have been obtained and procedure of their matching has been applied.. Special attention has been paid to the problem of wave drag. A formula for calculating wave drag of , axisymmetric and 3D bodies has been obtained. For this to be done, the integral form of the momentum equation has been employed. As a result, wave drag value is obtained by integrating velocity jump along shocks closing local supersonic zones. The formula for wave drag is the generalization of the Cole-Murman's one for steady transonic flow about an airfoil and a wing. Aerodynamic characteristics of some axisymmetric, elongated bodies and a fuselage-swept wing-tail configuration are analyzed. The results are compared with experimental data.

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