Клименко, М. О. та Кухнюк, О. М. та Klуmenko, M. O. та Kukhniuk, O. M. (2018) ДОСЛІДЖЕННЯ ТЕМПЕРАТУРНИХ РЕЖИМІВ В ГЕНЕРОВАНИХ ВИХРОВИХ ПОВІТРЯНИХ ПОТОКАХ. Вісник Національного університету водного господарства та природокористування (4(84)). с. 54-62.

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Анотація

Наведені результати є продовженням досліджень, що присвячені генерації вихрових потоків (торнадо). В результаті реалізації планованого експерименту, отримана математична модель, що дає змогу прогнозувати зміну температури повітря в верхніх шарах вихрових потоків (в межах факторів варіювання).

Title in English

INVESTIGATION OF TEMPERATURE REGIMES IN GENERATED VORTEX AIR FLOWS

English abstract

The presented results are a continuation of studies devoted to the generation of vortex flows (tornadoes). As a result of the planned experiment, a mathematical model was obtained that allows to predict the change in the air temperature in the upper layers of vortex flows (within the variation factors). The vorticial atmospheric conditions are one of the most common types of motion, both in nature and in modern technical devices. Such flows are characterized by the movement in the field of centrifugal forces and fundamentally different from the axial flows of gas by parameters such as: axial, rotational, radial velocity, gradients of static and full pressure, turbulence, etc. The following methodology for predicting temperature regimes under the conditions of swirling air flow has made it possible to determine the main significant parameters, modes and time characteristics that led to changes in the studied parameters. The study of changes in temperature indices in the upper layers of vortex flows was carried out with the help of a planned experiment on the installation described [1]. Experiments were carried out in a mode determined by the matrix of the three-factor plan of Box-Behnken (Table 1). The following factors, variations (studies) were selected: Engine revolutions – Vd; Angle of guides (creating vortex air movement in the installation) at the bottom of the installation – α; The area of opening of air damper (for adjusting the volume of air pumped through the installation) – Sz. The chosen variables of the planned experiment have different degrees of influence on the studied temperature change in the air vortex flow. The greatest effect was observed with certain combinations of factors. The greatest temperature difference was observed at the lowest values of the air guides (α = 5°) and the smallest value of the ratio of open air damper to the total installation area Sz. That is, the engine speed played a minor role in relation to the parameters that provide the degree of twisting of air flows, which in turn speaks of the significant effect of stable vorticial states of air on temperature change towards the decrease. Such conclusions are confirmed by natural vorticial phenomena in the form of a tornado, which is always accompanied by a sharp decrease in temperature. At the same time, the behavior of vortex entities (its mathematical models), in terms of the selected factors, suggests the need for further study of these processes and clarification of the conditions of generation and formation of tornado-like air masses.

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