Hydrodynamic Loads on the Water Chamber with Cavitating Dampers: Fid-Bau Portal

Hydrodynamic Loads on the Water Chamber with Cavitating Dampers

Bazarov, Dilshod / Obidov, Bakhtiyor / Norkulov, Bekhzod / Vokhidov, Oybek / Raimova, Ikboloy

The data on the hydrodynamic loads on the water tank in the presence of cavitating non-erosion energy absorbers are presented.

It is shown that these loads increase in comparison with the cavitation-free regime, but despite this, the use of erosion-free dampers in the appropriate conditions is appropriate, different, providing favorable downstream conditions and reducing the volume of construction work and the cost of the structure.

As a result of cavitation and cavitation-erosion studies of erosion-free energy absorbers in vacuum-cavitation stands (in which simulations are carried out in compliance with gravitational similarity), moreover, for different stages of cavitation $β = K / K_{cr}$ \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\beta = K/K_{cr}$$\end{document} ( $K -$ \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$K -$$\end{document} cavitation parameter; $K_{cr} -$ \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$K_{cr} -$$\end{document} its critical value characterizing the onset of cavitation), the drag coefficients C_x several types of erosion-free dampers (C_x—decreases with the development of cavitation $β$ \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\beta$$\end{document}), the pulsation components of the horizontal hydrodynamic load on the damper, as well as the standards for the pulsations of the vertical hydrodynamic effects of the flow on the reservoir plate in the installation zone of the erosion-free dampers measured by “point” sensors $P^{'} : γ v_{1}^{2} / 2 g$ \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$P^{\prime}:\gamma v_{1}^{2} /2g$$\end{document} (their maximum values are at $β \approx 0.5$ \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\beta \approx 0.5$$\end{document}, during supercavitation they decrease in comparison with those for the zero-cavitation regime), spectra and space–time transverse and longitudinal correlations of these pulsations.

Cavitation parameters were calculated according to the dependence

$K = (H_{har} - H_{cr}) : (\frac{v_{har}^{2}}{2 g})$ \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$K = \left( {H_{har} - H_{cr} } \right):\left( {\frac{{v_{har}^{2} }}{2g}} \right)$$\end{document}

where H_char = H_a + h, (H_a—pressure above the free surface of the flow in the vacuum—cavitation stand, and for nature, atmospheric pressure; h—height of the water column above the damper; v_har—the characteristic speed of the flow on the damper, which was taken from the diagram of the velocity distribution in front of the damper at the level of the damper top; g—acceleration of free fall; v₁—velocity in a compressed section with a depth h₁ in front of the damper (the experiments were carried out with the outflow of water from under the shutter).