Unsteady Pressure-Sensitive-Paint (PSP) measurements were conducted in a large wind tunnel used for industrial tests. For that purpose, Anodized-Aluminum PSP (AA-PSP) was used to investigate transonic buffeting effects on a civil aircraft. An aluminum alloy insert was manufactured and fitted in the model wing and prepared with AA-PSP coating. Images were acquired using a high frame rate camera up to 1000Hz. Fast data processing for image alignment and frequency analysis is performed using an in-house software which uses a graphic processor unit (GPU). The software processes images at rate of 30i/s which allows delivering the final results within a few minutes. Comparison with Kulite transducer measurements is provided, which is fairly good. A complex pressure pattern at low incidence has been revealed and is requiring further investigation.
Nomenclature
A(T), B(T), C(T) = temperature dependent calibration coefficientsfps = frame per second (image acquisition rate) FFT = Fast Fourier Transform I = intensity of light emitted by PSP I Ref = intensity of light emitted by PSP at reference condition M = Mach number p = surface pressure (Pa) P i0 = stagnation pressure (Pa) p Ref = surface pressure at reference condition (Pa) PSP = Pressure-Sensitive-Paint PSD = Power Spectral Density (Pa 2 /Hz) Rms = Root Mean Square S T = temperature sensitivity of the PSP (%/K) T = temperature (K) t 99 = pressure settle time (ms) α = angle of attack of the model
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