Abstract
Image alignment plays an important role in pressure-sensitive-paint (PSP) data processing. A systematic comparative13; study of two commonly used approaches, namely, image transformation using image-warping transforms13; before ratioing and, alternatively, image mapping on to three-dimensional model space (using resection methodology13; prior to ratioing) prior to ratioing, is attempted here. PSP results along with conventional static port data as13; on a generic aircraft model at a freestream Mach number of 0.6 and incidence of 10 deg (taken from earlier work)13; are utilized to critically assess the merit of the preceding two approaches. The analyses show that image-warping13; methods can result in larger errors in regions of strong spatial gradients of pressure and on bodies that are significantly13; three dimensional. Further, the resolution obtained from the resection approach is significantly greater (of13; the order of less than a pixel) compared to the transform methods.
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