MATEC Web Conf.
Volume 115, 2017XXXIII Siberian Thermophysical Seminar (STS-33)
|Number of page(s)||5|
|Section||Chapter 2 Turbulent flows, heat and mass transfer in single-phase flows, heat transfer enhancement|
|Published online||10 July 2017|
Transformation of spectra of refraction index fluctuations in axisymmetric supersonic jet with the increase in the distance from the nozzle
V.E. Zuev Institute of Atmospheric Optics SB RAS, Wave Propagation Laboratory, 634055 Ac. Zuev square, 1, Tomsk, Russia
* Corresponding author: firstname.lastname@example.org
In this paper the results of reconstruction of the radial dependence of refraction index fluctuations spectra in axisymmetric supersonic jet from laser transillumination data are presented. The reconstruction algorithm uses experimental spectra of laser radiation, received behind the jet, and the distribution of time-averaged axial air velocity within the jet. Laser transillumination experiments were performed on the Vertical Jet Unit of ITAM SB RAS (Novosibirsk, Russia). Reconstruction results show the refraction index spectra obey the power-law model, with power index different from that of the Kolmogorov turbulence model (−11/3). Within the first two barrels of the jet the power index is changing from ~−1 near the nozzle to ~−2.7 near the second Mach disk. Also some variations of power index and amplitude coefficient with the distance from the jet axis are found.
© The Authors, published by EDP Sciences, 2017
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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