Hydrodynamic loads on a water drain with cavitation quenchers

Obidov, Bakhtiyor; Vokhidov, Oybek; Shodiev, Bobur; Ashirov, B; Sapaeva, M.

doi:10.1088/1757-899x/883/1/012011

Cited by 35 publications

(7 citation statements)

References 6 publications

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“…To reproduce cavitation and study its effect on the elements of hydraulic structures, cavitation units are used. According to the principle of their operation, these installations can be subdivided into several groups: acoustic rotary and magnetostrictive installations, jet-impact vacuum stands, hydrodynamic tubes [22,23]. In hydraulic engineering, hydrodynamic tubes and vacuum benches are mainly used.…”

Section: Vacuum Unit Models and Similarity Criteriamentioning

confidence: 99%

Force effects of the flow on energy absorbers in the presence of cavitation

et al. 2021

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As the experience of operating high-pressure spillway structures shows, the operating conditions of the downstream extinguishing devices are very difficult. At flow rates, more than 12–15 m/s, downstream damping devices, as a rule, operate in a cavitation mode. First of all, this mode of operation gives rise to erosional destruction of the damper itself and the waters near it. This occurs where the cavitation torch closes on the structure. Attempts to avoid these desirable phenomena by lining erosion sites with steel sheets do not always lead to the desired result since it is not uncommon for the steel lining to be torn off by hydrodynamic forces. The separation of the cladding occurs in two cases: firstly, when the cladding is not in close contact with the concrete to be protected, and secondly, its anchoring is not enough. In both cases, fracture occurs from fatigue phenomena in the metal due to multiple oscillatory cycles from hydrodynamic loads. It is difficult to avoid this in cavitation modes since the spectrum of pressure pulsations, in this case, is very wide, which leads to oscillations of linings at resonant frequencies. Apparently, the strength of the linings is an object of special research, and in the future, it should be dealt with theoretically and experimentally. Hydrodynamic forces at high flow rates in the zone of intense energy extinguishing can reach such values that they can lift and overturn concrete slabs of water walls and water walls. Currently, there are practically no specific and accounting for vertical hydrodynamic loads on slabs of water walls in the presence of cavitation on erosion-free absorbers in the technical literature. To a certain degree of approximation, it is possible to use experimental data obtained on a model of the same structure but operating without cavitation, as data on hydrodynamic loads in the downstream of structures operating in a cavitation mode. The main disadvantage of such comparisons is that there is no guarantee that the amplitude and frequency characteristics of the flow during cavitation do not change (in particular, the amplitudes do not increase) as the cavitation limit is approached.

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Section: Vacuum Unit Models and Similarity Criteriamentioning

confidence: 99%

Force effects of the flow on energy absorbers in the presence of cavitation

et al. 2021

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“…The research was carried out at the vacuum bench of the laboratory of hydraulic structures of the MGMI. [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32].…”

Section: Experimental Technique Vacuum Unit Models and Similarity Criteriamentioning

confidence: 99%

Experimental study of horizontal effects of flow on non-erosion absorbers in the presence of cavitation

et al. 2021

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This article is devoted to one relatively small issue of the dynamics of hydraulic structures, the determination of horizontal hydrodynamic loads on energy absorbers of a high-pressure catchment area in a cavitating flow in the presence of erosion-free absorbers. In connection with the intensive construction of high and medium-pressure hydroelectric systems, spillways that operate at high flow rates, a very urgent task is to develop reliable and economical downstream devices that provide intensive damping of flow energy in a stilling well with favorable uninterrupted flow regimes and the absence of cavitation erosion of streamlined elements. Traditional methods of extinguishing energy using stilling wells and walls do not always solve the problem. In several cases, additional elements such as energy absorbers are installed, which effectively deal with malfunctioning currents. However, most of the used types of absorbers have a serious drawback - they are destroyed during cavitation studies by prof. N.P. Rozanov and his students made it possible, based on experiments, to develop several types of erosion-free or close to erosion-free dampers and obtain a dependence to determine the hydrodynamic loads acting on them at various stages of cavitation. This made it possible to use energy absorbers at high flow rates, which was done at the spillways of the Shamkhor and Artyomovsk hydroelectric power plants.

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“…This phenomenon was called deigish. Later, this term was extended to all cases of coastal erosion [8], [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Bank destruction in the middle section of the Amudarya River

et al. 2021

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The paper presents the results of a full-scale study of the banks destruction in the middle section of the Amudarya River. The article presents the main factors of coastal destruction during floods and low water periods. Recommendations for the protection of banks from erosion are also developed. As a result of studies of the intensive local re-formation process of an easily washed-out channel, the plan for hydraulic schemes for the occurrence of local erosion of the coast both with a steady and unsteady movement in an open flow was developed.

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Hydrodynamic loads on a water drain with cavitation quenchers

Cited by 35 publications

References 6 publications

Force effects of the flow on energy absorbers in the presence of cavitation

Force effects of the flow on energy absorbers in the presence of cavitation

Experimental study of horizontal effects of flow on non-erosion absorbers in the presence of cavitation

Bank destruction in the middle section of the Amudarya River

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