Abstract
A speckle photographic technique is used for visualizing the planar distribution of the refractive deflection angles of light transmitted through the compressible turbulent flow in a shock tube. Illumination by a short laser pulse allows to freeze the instantaneous pattern of the deflection angles as caused by the turbulent fluctuations of the gas density. Turbulent structures are visible in the patterns of the deflection angles’ isolines. A normal shock wave propagating through the turbulent density field causes structural changes of the observed patterns, which is quantified by determining the spatial correlation functions of the deflection angles.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
Erbeck, R. and Merzkirch, W., Speckle photographic measurement of turbulence in an air stream with fluctuating temperature, Experiments in Fluids, 6 (1988), 89–93.
Fomin, N., Merzkirch, W., Vitkin, D. and Wintrich, H., Visualization of turbulence anisotropy by single exposure speckle photography, Experiments in Fluids, 20 (1996), 476–479.
Françon, M., Laser Speckle and Applications in Optics, (1979) Academic Press, New York.
Hannapel, R. and Friedrich, R., Interaction of isotropic turbulence with a normal shock wave, Applied Scientific Research, 51 (1993), 507–512.
Keller, J. and Merzkirch, W., Interaction of a normal shock wave with a compressible turbulent flow, Exp. Fluids, 8 (1990), 241–248.
Lee, S., Lele, S. K. and Moin, P., Direct numerical simulation of isotropic turbulence interacting with a weak shock wave, Journal of Fluid Mechanics, 251 (1993), 533–562.
Lira, I., Measurement of an axisymmetric temperature field by speckle photography methods, Experiments in Fluids, 20 (1995), 100–105.
Mahesh, K., Lele, S. K. and Moin, P., The influence of entropy fluctuations on the interaction of turbulence with a shock wave, Journal of Fluid Mechanics, 334 (1997), 353–397.
Merzkirch, W., Flow Visualization (second edition), (1987), Academic Press, Orlando.
Merzkirch, W., Density-sensitive whole-field flow measurement by optical speckle photography, Experimental Thermal and Fluid Science, 10 (1995), 435–443.
Wernekinck, U. and Merzkirch, W., Speckle photography of spatially extended refractive-index fields, Applied Optics, 26 (1987), 31–32.
Wernekinck, U., Merzkirch, W. and Fomin, N. A., Measurement of light deflection in a turbulent density field, Experiments in Fluids, 3 (1985), 206–208.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Vitkin, D., Merzkirch, W. & Fomin, N. Quantitative visualization of the change of turbulence structure caused by a normal shock wave. J Vis 1, 29–35 (1998). https://doi.org/10.1007/BF03182472
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF03182472