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TsAGI Science Journal

ISSN Druckformat: 1948-2590
ISSN Online: 1948-2604

TsAGI Science Journal

DOI: 10.1615/TsAGISciJ.v40.i6.40
pages 669-682

ASSYMETRY AND NONUNIQUENESS OF THE SOLUTION OF THE PROBLEM OF SEPARATED FLOW OVER A SLENDER CONICAL WING-BODY COMBINATION

Aleksandr Vladimirovich Voevodin
Central Aerohydrodynamic Institute (TsAGI) 1, Zhukovsky str., Zhukovsky, 140180, Moscow region, Russia

ABSTRAKT

Performed are the numerical investigations of the separated flow over a slender circular cone-delta wing combination within a wide range of key parameters, with the combination being situated symmetrically relative to the free stream. Two approaches are used to solve the problem. Within the framework of the slender body theory, nonunique symmetrical and asymmetrical solutions are obtained. The area of existence of various solutions is specified. The 3D-RANS CFD calculations of the small aspect ratio combination with the forebody in the form of a circular cone and with the delta wing, taking into account the viscosity, are carried out. It is shown that in this case, the problem has unique solutions, which are symmetrical at small angles of attack and asymmetrical at greater ones. At relative angles of attack, being less than 2, the lift coefficients, obtained by two approaches, are very close. This fact estimates the application area of the slender body theory. The flow patterns in the section of the combination conical part, illustrating the flow peculiarities, are given.


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