Results of a numerical study of currents in the vicinity of a damless water intake

Krutov, Anatoly; Norkulov, Bekhzod; Uljaev, Farokhiddin; Jamalov, Farkhod

doi:10.1088/1757-899x/1030/1/012121

Cited by 44 publications

(53 citation statements)

References 12 publications

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“…From the point of view of vibration strength in units, the most dangerous are oscillations of a periodic nature, which are the result of mechanical, electromagnetic and hydraulic processes with pronounced discrete components. Such dangerous fluctuations are mainly strong diagnostic signals (that is, they stand out well against the background of vibration noise) [25][26][27].…”

Section:  mentioning

confidence: 99%

Experimental and theoretical studies of pumps of irrigation pumping stations

et al. 2021

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The article presents the results of a study of the wear of individual pump elements, a decrease in their efficiency and significant losses. The nonidentical operation of the extreme and middle pumps was established. The uneven approach of water to the extreme units created reverse flows of water in the suction pipes, work with vibrations of modes close to cavitation. The modernization of the pumps improved the cavitation characteristics due to the elimination of the cavitation center at the impeller inlet in the area of the driven disk, which increased the reliability and durability of the pump. Diagnostics of irrigation pumps made it possible to substantiate proposals for the modernization of their main units and operating modes. The distribution of pumps according to the general level of vibration is shown, indicating the direction at which the maximum value of vibration displacement was recorded and the results of a comparative measurement of the vibration of the units of the pumping station-1 of the Karshi Main Channel (KMC).Studies of the pumps of large irrigation pumping stations have shown a reduction in vibration and an improvement in basic operating parameters. With the participation of the authors, new complex methods of operation are being developed, which allow increasing its reliability by predicting the technical condition.

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Section:  mentioning

confidence: 99%

Experimental and theoretical studies of pumps of irrigation pumping stations

et al. 2021

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“…To ensure a guaranteed volume of water with a minimum volume of bottom and suspended sediments is considered an urgent task. The dynamics of the hydraulic and alluvial flow regimes in the bed of the pumping station inlet channels were studied in [7][8][9][10][11][12][13][14][15]. Sediments occur due to the hydrodynamic effect of the flow on the stand plate in the presence of cavitation, eroding water flow rate in the channels, and dynamic instability of large soil channels with wind waves [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…As already mentioned above, there has recently been a sharp change in the hydrological regime of the river. There are intense deformations of the supply channel border since it runs on easily washed-out soils [19][20][21][22][23][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Irrigation sedimentation tanks in the bed of the pumping station inlet channels

et al. 2021

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The article analyzes the dynamics of channel processes in the irrigation pumping station inlet channels. The field studies of hydraulic and alluvial sediment regimes in the supply channels of pumping stations are analyzed and summarized. The studies of supply channel water flow under conditions of extremely high turbidity of the flow and variability of the morphometric characteristics of the channel are presented. The conditions under which the Saint-Venant equations satisfactorily describe the channel flows in the bed of the supply channels are given. Saint-Venant's twodimensional equations were numerically implemented using an explicit finite-difference scheme. In addition, the results of calculations of the flow field in the supply channels are presented. According to the results of numerical studies, the width of the sedimentation tank was taken to be equal to the design width of the channel, and the speed of water flow in it was 0.25 m/s. The length of the sedimentation tank, ensuring the retention of sediments of the finest fraction (0.05 mm in diameter), was 1042 m. The siltation time of the sedimentation tank can be reduced by 15…20% and amount to about 15 months, considering the unevenness of the velocity distribution diagram in the horizontal plane and the trapezoidal crosssection of the clarifier. Nevertheless, the arrangement of two parallel chambers of the sedimentation tanks makes it possible to be stable for a sufficiently long time.

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“…Where: is horizontal drainage depth, m; Н is drainage rate or critical groundwater depth, m; Н is final (residual) head, m; ℎ о is water filling depth, m. The drainage rate is the minimum depth of groundwater at which there will be no salinization, and it depends on plants (cereals, alfalfa, and cotton), capillary, and waterphysical properties of the soil and climatic conditions [17][18][19][20][21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Reconstruction of the closed horizontal drains in the Jizzakh region

et al. 2021

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The article is devoted to the reconstruction of existing old drainage systems in order to radically improve the reclamation ecological and sanitary conditions of the lands of the Jizzakh region to improve the social conditions of the population and obtain high stable yields of cotton and other agricultural crops. As a result of many years of theoretical and irrigation to experimental research, operational monitoring in farms in the Pakhtakor district of Jizzakh region. The parameters of the primary horizontal drain are determined based on the analysis of reclamation climatic, soil, geological, hydrogeological, hydrological, economic, and other conditions. The calculation of the reconstruction of horizontal closed drainage is based on the method of A.N. Kostyakov in intensity from working the groundwater level after flushing. The depth of the drainage was determined, taking into account global climate change in recent years; based on these changes, an adjustment was made in the calculations to determine the value of the critical depths of groundwater during the operation of drainage systems. The incoming and outgoing parts of the water balance of the experimental plots were determined. In the presence of pressure groundwater, the size of the supply of groundwater with pressure water is determined. More proposed by the V.N. Shestakov's formula.

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Results of a numerical study of currents in the vicinity of a damless water intake

Cited by 44 publications

References 12 publications

Experimental and theoretical studies of pumps of irrigation pumping stations

Experimental and theoretical studies of pumps of irrigation pumping stations

Irrigation sedimentation tanks in the bed of the pumping station inlet channels

Reconstruction of the closed horizontal drains in the Jizzakh region

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