The cryogenic Rohr wind tunnel (KRG) in Göttingen is a research and development facility for aerodynamic experiments.

Intermittent, blow-down wind tunnel of the Ludwieg tube concept, pressurized by vaporized liquid nitrogen

Main features

Test section

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0.4 m x 0.35 m test section with adaptive upper and lower walls

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Mach control by adjustable sonic throat valve

Operating range

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0.3 < Ma < 0.95

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300 < P < 1,000 kPa

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Re_0.1√(S) < 15 x 10⁶

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100 K < T < 280 K

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Run time < 1 s

Model support

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Remotely controlled 2D support

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Remotely controlled y-z traversing system used as model support

Auxiliary systems

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Remotely controlled y-z traversing system for probe positioning (pressure rake)

Typical tests

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Tests with flow control devices (vortex generators, suction, blowing, trailing edge devices) on 2D airfoils, helicopter blades, flat plates

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Fundamental research of fluid dynamic phenomena and effects influenced by Reynolds number (spheres, cylinders, blunted or slender bodies, etc.)

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Model deformation measurements

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Air data system and probe calibration