The paper presents experimental data on determining a level of turbulence over a heated metal surface in the saturated turbulence regime, which cannot be explained by the classical Kolmogovov-Obukhov theory. A spectral behavior of temperature fluctuations is studied. Based on the calculated data of the structural function and the spectrum of temperature fluctuations, the level of turbulence over the heated surface is determined along the height. Estimation of the outer scale of turbulence showed that in the center of the metal surface the outer scale increases with height. At the surface boundary, cascade generation-dissipation of vortices is observed.

Spectrum for smoke absorption factor over the range of 0.28 ÷ 6.5 microns is presented. Measurements were carried out in the model local forest fire at natural convection without a wind. Absorption lines ofwater vapor (bands of I .8 and 2.7 microns) and carbonic gas (band of4.3 microns) were identified in the spectrum. It was shown, that the concentration in smokes at the rear of fire front increased by a factor of I .5÷ 2 for water vapor, and up by a factor of 3 for carbonic gas in comparison with initial concentration in the clean medium.

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