Abstract
The leading-edge vortices on a delta wing are visualized by using a pressure-sensitive paint (PSP). This technique is based on the oxygen quenching of luminescent molecules. In this experiment, the paint composed of PtOEP and fluorine polymer was adopted because it showed high sensitivity to the pressure and low sensitivity to temperature. A thin paint coating was applied on a delta wing model composed of aluminum. The paint was excited by a Xenon light and the luminescent images were obtained using a high-resolution CCD camera. The obtained images were analyzed on a personal computer. The complicated flow structures on the delta wing including vortex breakdown were visualized clearly by using the pressure-sensitive paint.
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