DETECTION OF TRANSITION BY INFRARED IMAGE TECHNIOUES

Authors

  • Armin Quast

Keywords:

Aerodynamics, Design

Abstract

The infrared technique is a powerful tool for transition line detection. The whole model area can be under surveillance with respect to turbulent wedges, or even smaller subcritical disturbances in the laminar boundary layer. This technique has been successfully applied in different wind tunnels and in free flight experiments. In most cases "natural" temperature differences between the model and the fluid gave reasonable or good infrared images. In one case, switching on and off the wind tunnel cooling systems gave good results. Nevertheless, the most comfortable means is the internally heated model. Infrared technique is also suitable for free flight experiments.

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Issue

Vol. 13 No. 3 (1989)

Section

Articles

License

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