Title :
A MHz rate imaging system for study of turbulent and time evolving high speed flows
Author :
Thurow, B. ; Hileman, J. ; Samimy, M. ; Lempert, W.
Author_Institution :
Dept. of Mech. Eng., Ohio State Univ., Columbus, OH, USA
fDate :
8/1/2001 12:00:00 AM
Abstract :
We present a second generation MHz frame rate imaging system, based on a custom fabricated "pulse-burst" laser and a commercial CCD framing camera. The utility of the system for high-speed flow visualization is demonstrated in a Mach 1.3 axisymmetric jet. Complete 17 frame image sequences are used to explore the evolution and interaction of large scale structures and to determine their convective velocity, employing a novel spatial correlation technique, which includes a "translating template" that convects downstream with the structure being tracked. Preliminary progress towards the development of a MHz rate Planar Doppler Velocimetry diagnostic is also included
Keywords :
CCD image sensors; Doppler measurement; correlation methods; flow visualisation; image sequences; jets; laser velocimetry; real-time systems; turbulence; CCD framing camera; Mach 1.3 axisymmetric jet; convective velocity; high-speed flow visualization; large scale structures; planar Doppler velocimetry; pulseburst" laser; second generation MHz frame rate imaging; spatial correlation; translating template; Charge coupled devices; Charge-coupled image sensors; Gas lasers; Optical pulse generation; Optical pulses; Pulse amplifiers; Pulse measurements; Ring lasers; Solid lasers; Visualization;
Conference_Titel :
Instrumentation in Aerospace Simulation Facilities, 2001. 19th International Congress on ICIASF 2001
Conference_Location :
Cleveland, OH
Print_ISBN :
0-7803-7022-8
DOI :
10.1109/ICIASF.2001.960234
