MEASUREMENT OF CONCENTRATION PULSATIONS
IN A SHEAR TURBULENT FLOW BY THE METHOD
OF AVERAGED TALBOT IMAGES

M. V. Doroshko, O. G. Penyaz'kov,
P. P. Khramtsov, and I. A. Shikh

UDC 532.517.4

The method of two-exposure Talbot photography has been 
adapted to analysis of the flow structure in a two-dimensional turbulent 
submerged jet of helium flowing out into an air space and in a gas 
flow behind the incident shock wave in a shock tube. Measurement of 
the local shift of the intensity maxima in the time-ave- raged Talbot 
image made it possible to determine, for the cases investigated, the 
two-dimensional array of angles of refraction of light with an error 
to 5%. The distribution of the averaged refractive index of the medium 
and the concentration of the gas over the flow field has been calculated 
by integration of the distributions obtained.

A. V. Luikov Heat and Mass Transfer Institute, National 
Academy of Sciences of Belarus, 15 P. Brovka Str., Minsk, 220072, 
Belarus. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 81, 
No. 1, pp. 49-54, January-February, 2008. Original article 
submitted September 27, 2007.