V. N. Kopeitsev

Method of impact on free nonstationary air vortices

The investigation results of the effect of vertical net obstacles on the dynamics of nonstationary air vortices generated under laboratory conditions above a heated underlying surface are presented. A generalization of the data obtained for the influence of the net obstacles of various geometries on the model of free vortices of various intensities has been performed.

The possibilities of visualization in the case of simulation of air tornados

Video filming and various visualization methods are used to demonstrate the possibility of studying the dynamics of free concentrated vortexes generated under laboratory conditions over an underlying surface heated from below. The visualization of vortexes is accomplished by means of magnesia and smoke particles, as well as by using a plane light knife (laser knife). The emergence and development of internal space of free air vortexes (which is an analog of “storm eye”) are studied.

Simulation of free heat vortexes: Generation, stability, control

We pose and solve the problem of physical (laboratory) simulation of free concentrated vortexes without the use of mechanical rotation devices. We consider the questions of generation and stability of free heat vortexes, as well as methods of controlling their characteristics.

The parameters of unstable stratification of air leading to generation of free vortexes

The thermal modes of heating (cooling) of underlying surface are investigated, as well as the space-time field of air temperatures at which the unstable stratification leads to the generation of free vortexes.

The possibility of influencing vortex atmospheric formations

Video filming is used to investigate the possibility of influencing the characteristics of free concentrated vortexes generated under laboratory conditions over a heated underlying surface. The method of influencing consists in arranging obstacles in the form of vertical nets of different geometries in the path of air vortex.

Controlling the behavior of air tornados

Video filming and photography are used to investigate the possibility of controlling the behavior of free concentrated vortexes generated under laboratory conditions over an underlying surface heated from below. The method of control consists in placing obstacles in the form of vertical or horizontal grids in the path of propagation of air vortex. Comparison is performed of the mechanisms and of the degrees of effect made by vertical and horizontal grids on the behavior of vortex structures.

The generation of free concentrated air vortexes under laboratory conditions

Video filming is used to investigate the dynamics of free concentrated vortexes which arise over a heated underlying surface as a result of unstable stratification of air. Various types of trajectories of motion of the base of vortex structures are revealed. Parameters are analyzed such as the temperature of underlying surface, the region of emergence of vortex structures, the lifetime, and the direction of motion, which define the type of trajectory of vortex base.

The possibility of generation of concentrated fire vortices without forced swirling

The possibility in principle of physical simulation of concentrated fire vortices in laboratory conditions without using mechanical swirling devices is shown.

Tornado‐Like Gas‐Solid Flow

The fundamental possibility of physical simulation of wall‐free concentrated air vortices under laboratory conditions was demonstrated. Video filming is used to investigate the dynamics of air vortices which arise over a heated underlying surface as a result of unstable stratification of air. Various types of trajectories of motion of the base of vortex structures are revealed. Parameters are analyzed such as the temperature of underlying surface, the region of emergence of vortex structures, the lifetime, and the direction of motion, which define the type of trajectory of vortex base.

Generation of free concentrated fire vortices under laboratory conditions

The possibility of the principle of physical simulation of free concentrated fire vortices without using a forced twist is demonstrated. Vortex structures were generated during combustion of urotropine (hexamethylenetetramine) pellets placed on the underlying surface (aluminum sheet). The first data on the features of the occurrence of fire vortices were obtained by photographs. Estimates of some integral parameters of the generated fire vortex structures (lifetime, height, and diameter) are carried out.