Methods of experimental investigations of the Görtler instability in boundary layers (review)
T.A. Gimon, S.V. Lukashevich, S.O. Morozov, A.N. Shiplyuk
Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
Keywords: boundary layer, laminar-turbulent transition, Görtler instability, Görtler vortices, vortex excitation, measurement techniques
Abstract
The paper presents a review of the methods of experimental investigations of the Görtler vortices in boundary layers. The proposed models are used in experiments for the analysis of the Görtler instability; the major methods of Görtler vortex generation are described. It has been revealed that spontaneous uncontrolled emergence of the Görtler vortices is caused by the roughness of model surfaces (especially in the area of the leading edge of a plane model) and free-stream disturbances. Effective methods of introduction of controlled stationary and nonstationary disturbances generating the Görtler vortices in the boundary layer are described. The methods of experimental measurements of boundary layer parameters in the presence of the Görtler vortices are presented; the diagnostic capabilities of these methods are demonstrated, and the major scientific results obtained by these methods are reported.
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