Flight Simulation Technologies Conference and Exhibit · 1990 · 17 citations · 1 references
Natural SciencesMaterials ScienceMechanical EngineeringHeat TransferSpectroscopyThermal AnalysisInfrared DetectorsInfrared InstrumentationInfrared Remote SensingInfrared SpectroscopyThermal Boundary LayersTransonic AerodynamicsAirfoil AerodynamicsCryogenic DetectorsCryogenic Heat TransferCryogenic InstrumentationCryogenic Temperature MeasurementCryogenic ThermometryTransition Detection
Boundary-layer transition detection studies were carried out in the 0.3 Meter Transonic Cryogenic Tunnel on a supercritical airfoil, using an infrared imaging system. The purpose of the experiments was to determine the extent of the temperature range in which commercially available IR systems can detect transition in cryogenic environment. The experiment was designed to take advantage of a combination of factors including the wind tunnel operation mode, the model construction materials and the IR system image processing options. During the initial phases of the study, the IR based findings were confirmed by measurements done with a micro-thin hot-film system. Ultimately, free and forced transition could be detected down to 170 K.
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