Development of Ultrafast Response Pressure-Sensitive Paints forVisualization of Shock Wave Phenomena

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The objective of this study is to develop ultrafast-response Pressure-Sensitive Paint (PSP) with the response time less than 1 μs for visualization of shock-wave phenomena. In order to apply PSP to unsteady shock-wave phenomena, Anodized-Aluminum PSP (AA-PSP) with ultrafast response was fabricated and its response time to a step pressure change was evaluated by using a shock tube. To fabricate AA-PSP with ultrafast response, we selected phosphoric acid electrolyte and changed electrolyte temperature in a systematic manner. The improved AA-PSP achieved a response with the time constant of 0.35 μs. This is the fastest PSP ever reported. We applied this AA-PSP to interactions of a moving shock wave with a circular cylinder. The results show that the improved AA-PSP can visualize the shock reflections and the shock diffractions with the ever-highest spatial and temporal resolution.