Галич, О. О. та Halych, O. O. (2018) ОСОБЛИВОСТІ ВИЗНАЧЕННЯ ОСНОВНИХ ПАРАМЕТРІВ ХВИЛЯСТОГО СТРИБКА. Вісник Національного університету водного господарства та природокористування (2(82)). с. 64-70.

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Анотація

В статті розглядаються особливості визначення параметрів хвилястого стрибка, до яких можна віднести спряжені глибини та максимальну глибину. Наводяться основні класичні залежності для визначення вказаних параметрів, а також залежності, що враховують негідростатику та втрати енергії в початковому перерізі явища. Дається співставлення параметрів хвилястого стрибка, отриманих за теоретичними залежностями, з експериментальними даними.

Title in English

PARTICULARITIES OF UNDULAR JUMP MAIN PARAMETERS DETERMINING

English abstract

During operating of different hydrotechnical and hydropower constructions, very often the phenomenon of undular hydraulic jump can occur. The main parameters of this phenomenon should be taken into account during designing, operating and reconstruction of mentioned constructions. The article considers the particularities of determination of the main parameters of undular jump, i.e. first and second conjugated depths and maximum depth. The first conjugated depth can be measured at the initial cross-section of considered phenomenon, that is cross-section where the free-surface flow stars arise sharply. The first conjugated depth influences on value of Froude number, which is one of the important flow characteristics and determines the conditions of undular jump formation. The second conjugated depth can be measured at the point of flow curvature change, moreover at this point the pressure distributes according to hydrostatic low. This depth also characterizes the average flow depth in the tail water. The maximum depth can be measured under first or second wave crests of undular jump and the value of height of this wave can exceed the average height of other waves. This depth determines the level of upper part of side canals dikes, the level of lower part of bridge beams, the height of free-flow tunnels, waterway etc. The article gives general classic equations for determining the mentioned parameters, furthermore equations that take into account the non-hydrostatic pressure distribution and energy losses at the initial cross-section of phenomenon. The aim of the article is to make the comparison between data of main parameters of undular jump, that were received by theoretical equations, with experimental data. In consequence of compering of undular jump parameters the recommendations of usage of considered formulas depending on Froude number at the initial cross-section of undular jump are given. When Froude number is Fr1=1,0-1,80 it is needed to take into account non-hydrostatics at the initial cross-section and when Froude number is Fr1≥1,80 it is needed to take into account the energy losses in undular jump.

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