Preparation and properties of novel aerodynamic pressure-sensitive paint via the sol-gel method
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Xing-De Dong and Gui-Chun Li Beijing Institute of Aerodynamics, Beijing, 100074, China
Dao-Ben Zhu and Lei Jiang The Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100080, China (Received 5 March 2001; accepted 11 March 2002)
A novel aerodynamic pressure-sensitive paint (PSP) was prepared by using the sol-gel process for measuring the pressure distribution variation on an aerodynamic surface with an oxygen-containing gas flow. In this PSP, RuII complexes as oxygen-sensitive probe molecules excited with visible light of 436 nm were dispersed into the organic modified silica matrix film prepared by the sol-gel method. A linear relationship between the emission intensity and the oxygen partial pressure was achieved in the airflow pressure range of 10.1–405 kPa, and the slope that represents the sensitivity of PSP for oxygen quenching reaches 0.75. A pressure distribution map was demonstrated showing a spatial resolution of 0.25 mm.
I. INTRODUCTION
A convenient and inexpensive method for determining surface pressure distribution generated by airflow over the aircraft is always a challenge faced by the aerodynamicist. While pressure taps and thermocouples allow property measurements at discrete locations, a luminescent coating enables measurement of essentially continuous property distributions, limited only by the resolution of the imaging equipment.1 Over the past decade, the pressure-sensitive paint (PSP) technique based on photoluminescence and oxygen quenching has emerged as a viable tool for measuring surface pressure distributions in wind tunnels.2–8 In comparison with conventional measurements with discrete taps and orifices, the PSP technique has several advantages of continuous pressure measurements with high spatial resolution, simplified operation processes, and cheapness. Thus, the PSP technique has recently received more and more attention and is called a revolution of the pressure measurement technique in a wind tunnel.3,9 The first PSP illuminated by ultraviolet light of 360 nm had been developed at the University of Washington (UW),2,10 where platinum octaethylporphyrin (PtOEP) as a luminescent probe molecule was suspended
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J. Mater. Res., Vol. 17, No. 6, Jun 2002 Downloaded: 16 Mar 2015
in a commercial silicone resin (Genesee Polymer Corp., Flint, MI, GP-197). Undesirable characteristics include high temperature sensitivity and rapid photodegradation. Following that, several other PSP materials had been produced.11–13 And several kinds of PSP developed at McDonnell Douglas Aerospace have been used to obtain invaluable data on wind tunnel tests.14–19 Excellent work on the PSP technique has also been done at NASA Ames,20,21 including development of proprietary PSP.21 UW subsequently developed an improved paint in which the active molecule is another platinum porphyrin, platinum tetra(pentafluorophenyl)porphine (PtTFPP), and the binder is fluoro/
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