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The cryogenic wind tunnel (KKK) in Cologne is a cryogenic facility for research, development and data set measurements
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Type of wind tunnel
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Closed circuit, continuous, low-speed wind tunnel with a closed wall test section. Operation either at ambient temperature or cooled down by injection of liquid nitrogen.
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Main features
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Test section
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2.4 m x 2.4 m closed-wall test section
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Operating range
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0 < Ma < 0.38
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Re0.1√(S) < 9.5 x 106
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100 K < T < 300 K
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Model support
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Sword with integrated roll support
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Half-model and surface vehicle support with under-floor balance
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Half-model support with tangential blowing at synchronized turntables
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Auxiliary system
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Integrated optical traversing system
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Typical tests
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2D airfoil tests with high-lift and flow control devices (flaps, slats, vortex generators, trailing edge devices)
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Wind rotor blades
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Half-model tests of transport aircraft in high-lift configurations
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Surface vehicles (trains, trucks)
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Probe calibration, function and reliability tests
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