A Method of Investigating Scales of Motion in a Turbulent Wake
Final rept. Dec 1989-Aug 1990
ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
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Knowledge of the scales of motion in the flow around a body is important for accurate turbulence modeling in computational fluid dynamic calculations. Useful data can be measured in wind tunnel experiments, but often not for the free flight conditions of interest. This report examines the possibility of determining such information from shadowgraphs taken in a ballistic range. The application of digital scanning machines and spatial correlation interrogation to shadowgraphs are described. One method of analyzing a shadowgraph to extract information about turbulence structures in the flow field is discussed. Results are shown for the analysis of two regions in the wake of a projectile. This method might be used to quantify the effects of various projectile modifications on a turbulent structure, for example the introduction of a base burn unit.
- Fluid Mechanics