Development of High Speed Interferometry Imaging and Analysis Techniques for Compressible Dynamic Stall
Abstract
The development of a high-speed, phase-locked, real-time, point diffraction interferometry system for
quantitative imaging of unsteady separated flows is described. The system enables recording of up to 224
interferograms of the dynamic stall flow over an oscillating airfoil using a drum camera ·at rates of up to 40
KHz, controlled by custom designed electronic interlocking circuitry. Several thousand interferograms of
the flow have been obtained using this system. A comprehensive image analysis package has been developed
for automatic processing of this large number of images. The software has been specifically tuned to address
the special characteristics of airfoil flow interferograms. Examples of images obtained using the standard
and the high-speed interferometry techniques are presented along with a demonstration of the image
processing routine's ability to resolve the fine details present in these images.
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