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Advanced Measurement Techniques for High Reynolds Number Testing in Cryogenic Wind Tunnels U. Meanwhile, the cryoTSP technique has become the major tool for laminar flow investigations in cryogenic wind tunnels and the technique has been operated successfully in the ETW, the pilot-facility of the ETW (PETW), the cryogenic wind tunnel of the German-Dutch Windtunnels in Cologne (DNW-KKK), and the cryogenic Ludwieg Figure 2.
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