Image Measurement of Surface Pressure Distribution on a Model in a Unsteady Flow using AA-PSP

Pressure-sensitive luminescent coating on porous anodized aluminum (AA-PSP) was applied to measure non-periodic unsteady pressure distribution on a wind-tunnel model. A high-speed digital video camera was used to capture the PSP signal. A hydrophobic coating was applied on the anodized aluminum surface to suppress the humid sensitivity of the AA-PSP. A temperature sensitive paint was used to obtain the temperature distribution instantaneously with the pressure. The temperature data was used to correct the PSP response. The present system was applied to measure the pressure distribution on a delta wing at a high angle of attack in transonic flow. The non-periodic unsteady pressure distribution on the delta wing was successfully measured with the sampling rate of 1 kHz and within a few percents error in absolute pressure level.