Development of High Speed Interferometry Imaging and Analysis Techniques for Compressible Dynamic Stall
Authors
Chandrasekhara, M.S.
Carr, L.W.
Wilder, M.C.
Subjects
interferometry technique
high speed interfermetric imaging
compressible dynamic stall
high speed interfermetric imaging
compressible dynamic stall
Advisors
Date of Issue
1997-09
Date
September 1997
Publisher
Language
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.
Type
Report
Description
Series/Report No
Department
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
U.S. Army Research Office, ARO 32480.10-EG
Funder
U.S. Army Research Office, ARO 32480.10-EG
ARO MIPR 133-94
ARO MIPR 133-94
Format
13 p.
Citation
Paper presented at the AGARD FDP Symposium on "Advanced Aerodynamic Measurement Technology",
held in Seattle, United States, 22·25 September 1997, and published in CP·601.
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.