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- W2325713057 abstract "This investigation concerns the design, build, and testing of a new class of skin friction sensors capable of performing favorably in high-speed, high-enthalpy flow conditions, such as those experienced by atmospheric re-entry vehicles, scramjets, jet engines, material testing, and industrial processes. Fully understanding and optimizing these complex flows requires knowledge of the relevant aerodynamic properties, which, in turn, requires numerical and analytical modeling as well as reliable diagnostic instrumentation. The present skin friction sensor design was founded on a direct-measuring, non-nulling, cantilever beam arrangement. A rigorous, multi-step approach was developed to systematically test the sensor through various facilities, where flow enthalpy and run duration were progressively increased, culminating in simulated scramjet flight conditions at the Air Force Research Laboratory. The first phase of the investigation concerns itself with the validation of the sensor to ensure that the measured wall shear values were within an accurate range of the true values. The validation cycle was conducted through an initial series of calibrations to characterize the sensors’ static, dynamic, pressure, and thermal responses. The use of bench test facilities further identified the vibratory response and electromagnetic interference properties of the sensor. The cycle was concluded in the Virginia Tech Hypersonic Tunnel under simple, Mach 3 flow conditions. Flow stagnation temperatures and pressures ranged from 300 to 655 K (540 to 1180 °R) and 750 to 1000 kPa (109 to 145 psia), respectively. Wall shear was experimentally measured between 132 and 248 Pa (2.76 and 5.18 psf) over a skin friction coefficient range from 0.00104 to 0.00192. The experimental measurements demonstrated favorable agreement with independent analyses including flat-plate analytical estimations, numerical turbulence model predictions, and historical direct-measuring skin friction sensor data. The total uncertainty of the present skin friction sensor was determined to be ±8.7% at 95% confidence." @default.
- W2325713057 created "2016-06-24" @default.
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- W2325713057 date "2014-06-13" @default.
- W2325713057 modified "2023-09-26" @default.
- W2325713057 title "Skin Friction Sensor Validation for High-Speed, High-Enthalpy Flow Applications" @default.
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- W2325713057 doi "https://doi.org/10.2514/6.2014-2800" @default.
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