byAmer, Tahani R.; Liu, Tianshu; Oglesby, Donald M
One effect of using pressure sensitive paint (PSP) is the potential intrusiveness to the aerodynamic characteristics of the model. The paint thickness and roughness may affect the pressure distribution, and therefore, the forces and moments on the wind tunnel model. A study of these potential intrusive effects was carried out at NASA Langley Research Center where a series of wind tunnel tests were conducted using the Modem Design of Experiments (MDOE) test approach. The PSP effects on the... Topics: TECHNOLOGY UTILIZATION, TECHNOLOGY TRANSFER, GROUP TECHNOLOGY (MANUFACTURING), INFORMATION...
bySubramanian, Chelakara S.; Amer, Tahani R.; Oglesby, Donald M.; Burkett, Cecil G., Jr
The current pressure sensitive paint (PSP) technique assumes a linear relationship (Stern-Volmer Equation) between intensity ratio (I(sub 0)/I) and pressure ratio (P/P(sub 0)) over a wide range of pressures (vacuum to ambient or higher). Although this may be valid for some PSPs, in most PSPs the relationship is nonlinear, particularly at low pressures (less than 0.2 psia when the oxygen level is low). This non-linearity can be attributed to variations in the oxygen quenching (de-activation)... Topics: ARCHITECTURE (COMPUTERS), FAULT TOLERANCE, COMPUTER NETWORKS, TOPOLOGY, QUALITATIVE ANALYSIS,...