Abstract of
LOCAL SHEAR STRESS MEASUREMENTS WITHIN A RECTANGULAR
YAWED CAVITY USING LIQUID CRYSTALS
N. Toy , P. J. Disimile, & E. Savory
The present work is an experimental investigation of the
surface flow and shear stress distribution within a rectangular cavity at M =
2 for different approach flow yaw angles. The cavity has a length-to-depth ratio
of 2 and a planar aspect ratio of 11.79 and was positioned within a turbulent
boundary layer at a Reynolds number based on momentum thickness of 7.3 x 10000.
Full field surface flow data were provided by recording and processing the colour
change of cholesteric shear stress sensitive liquid crystals for nineteen different
yaw angles between 0 degrees and 90 degrees. The information gained from these
image analyses was then compared to measurements of the sound pressure fluctuation
levels obtained within the cavity in order to explain the possible cause of the
changes in these levels as the cavity is yawed.
Return to Optical
Diagnostics in Engineering, Volume 3, Part 1 Contents