Impact of acoustic oscillations on thermal tornado stability

This paper presents physical modeling of thermal tornado under lab conditions. For the tested range of 0÷300 Hz, selective frequencies were discovered which facilitate the tornado decay. Data analysis was complemented by velocity profile measurement using LDV system LD-05M. The results on velocity pulsation at selected points were recalculated into coefficient of correlation between velocities and function cos(2πfΔt _i ) describing the acoustic oscillations. In the theoretical part of this paper, we present solution of dispersive equation of Euler’s model and resulting boundary of stability for tornado existence. Satisfactory agreement between experiment and calculation has been observed.