Abstract
This article describes the schlieren apparatus developed at the Institut für Luftfahrttechnik und Leichtbau (ILT, Institute of Aeronautics and Structures) for the Transonic Wind Tunnel of the Munich University of the Federal Armed Forces (TWM). Special features are the application of four separate, variously coloured beams of rays to identify the direction of density gradients and the line grids which are attached to the knife edges, in order to permit a quantitative evaluation of the amount of ray deflection and of the thermodynamical quantities.
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Abbreviations
- c :
-
sensitivity
- h :
-
light deflection
- M :
-
Mach number
- s :
-
distance
- O :
-
order of schlieren lines
- T :
-
spacing of the line grids
- x :
-
horizontal direction
- z :
-
vertical direction
- α:
-
angle of attack
- ϕ :
-
angle of light deflection
- ϱ:
-
density
References
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Scheitle, H., Wagner, S. A four colours line grid schlieren method for quantitative flow measurement. Experiments in Fluids 9, 333–336 (1990). https://doi.org/10.1007/BF00188763
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DOI: https://doi.org/10.1007/BF00188763