Reconstruction Of A Three Dimensional Transonic Rotor Flow Field From Holographic Interferogram Data
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Three-dimensional, Transonic Rotor Flow Field Reconstructed from Holographic Interferogram Data
Holographic interferometry and computer-assisted tomography (CAT) are used to determine the transonic flow field of a model rotor blade in hover. A pulsed ruby laser recorded 40 interferograms with a 61 cm-diam view field near the model rotor-blade tip operating at a tipo Mach number of 0.90. After digitizing the interferograms and extracting fringe-order functions, the data are transferred to a CAT code. The CAT code then calculates pressure coefficients in several planes above the blade surface. The values from the holography-CAT method compare favorably with previously obtained numerical computations and laser velocimeter measurements at most locations near the blade tip. The results demonstrate the techniques's potential for three-dimensional transonic rotor flow studies. Keywords: Holographic interferometry; Computer assisted tomography; Helicopter aerodynamics; Transonic aerodynamics.