EXPERIMENTAL TECHNIQUES OF THE STUDY OF THE VORTEX DISTURBANCES STRUCTURE CAUSED BY POINT INJECTION ON THE SWEPT WING LEADING EDGE

Read more The article contains the results of thermoanemometry on the curvilinear surface and liquid crystal thermography techniques for the investigation of the flow stability on the swept wing leading edge. The numeric results of the velocity disturbance distribution in the boundary layer near the attachment line were received with a help of the thermoanemometry technique. It was found out, that the boundary layer become less stable, when a stationary vortex modifies the flow. The liquid crystal thermography technique allowed to expand the workspace for investigations up to 70° from the attachment line, to receive the visualization pictures of disturbed flow for several regimes of blowing, to reveal an influence of the blow velocity on dimensions and trajectory of stationary disturbances, which were induced by injection. The results of visualizations are in a good agreement with thermoanemometry results.

Keywords:
swept wing, cross-flow instability, leading edge, visualization, thermoanemometry, liquid-crystal thermography, point-source blowing, streamwise vortices.
УДК 532.526

EXPERIMENTAL TECHNIQUES OF THE STUDY OF THE VORTEX DISTURBANCES STRUCTURE CAUSED BY POINT INJECTION ON THE SWEPT WING LEADING EDGE