Numerical substantiation of the parameters of the air-hydraulic hood by a diaphragm

Bazarov, O. A.; Jonkobilov, Ulugmurad; Jonkobilov, Sobir; Rajabov, Ulugbek; Xoshiyev, Shukhrat

doi:10.1051/e3sconf/202126403035

Cited by 3 publications

(5 citation statements)

References 10 publications

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“…3.4). According to the calibration curves [6,7], the parameters of the steady motion of the liquid are determined: flow rate Q, velocity ϑ0, air volume W0 in the absorber at absolute pressure pga(Hga), absolute hydrodynamic pressure p0a(H0a) in the pressure pipe 7 (Fig. 1) and head loss hd0 in the connecting pipeline 8 (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…To experimentally verify the reliability of the existing method for calculating the absorber (cap) with a diaphragm and the eligibility of using this method to calculate the absorber without a diaphragm in order to verify the proposed calculation method, special studies were carried out in the laboratory of hydraulics of the Karshi Engineering and Economic Institute, the methodology for which is described [6,7]. The diagram of the pumping unit is shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

“…Rakhmatulin [2] in the study of the cap, the law of compression and expansion of air took adiabatic (n=1.4). In [3,4,5,6,7], the authors adopted the law of compression and expansion of air by isothermal (n=1.0) when studying caps.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Hydraulic shock damper with and without diaphragm

Jonkobilov¹,

Rajabov

Jonkobilov

2022

IOP Conf. Ser.: Earth Environ. Sci.

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The article provides an analysis of scientific papers devoted to the study of hydraulic shock absorbers used in pumping stations with long pressure pipelines. The efficiency of pumping stations depends on ensuring trouble-free operation - the reliability of pressure-hydraulic systems. The reliability of pumping units and long pressure pipelines is ensured using the proposed designs of hydraulic shock absorbers. In the experimental study of hydraulic shock absorbers, modern scientific instruments were used. The authors of this work have developed a special pressure sensor to record changes in hydrodynamic pressure during hydraulic shock. The paper presents the results of experimental studies of hydraulic shock absorbers with and without a diaphragm. At the same time, a reliable agreement was obtained between the results of calculations of hydraulic shock absorbers with and without a diaphragm using the proposed method with experimental data. The performed research experiments prove that the damper with a diaphragm is a very effective and economical water hammer damper for long pressure pipelines of pumping stations with the values of the polytropic coefficient n=1.2. Calculations and experiments confirm that the proposed method for calculating an absorber with a diaphragm can be applied to calculate an absorber without a diaphragm.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Hydraulic shock damper with and without diaphragm

Jonkobilov¹,

Rajabov

Jonkobilov

2022

IOP Conf. Ser.: Earth Environ. Sci.

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“…However, it is very common to observe that open collectors are muddy and filled with all kinds of foreign plants. This limits the movement of underground seepage water on the slope when it enters the collectors [1,2,3]. The following factors cause the collectors to become cloudy and weeded: 1) design errors in the design of reservoirs and collectors; 2)-Managers (operators) of excavators used during the cleaning of waste and collectors change the design indicators of collectors.…”

Section: Introductionmentioning

confidence: 99%

Digging and cleaning collectors using excavators equipped with innovative automatic control navigator

Abduraimova

Оtakhonov

Jonkobilov³

et al. 2023

E3S Web of Conf.

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This article presents the problems of guaranteeing high work productivity in the digging or cleaning of ditches and collectors, as well as the implementation of design indicators, as specified in the project, and measures to eliminate them using modern innovative technologies. Ditch and collectors work at the level of demand, improve land reclamation conditions, increase productivity and reduce the volume of additional earthworks, increase economic efficiency to high levels. The results of the conducted scientific research showed that during the construction of the open pit, the volume of earthworks was reduced by 15%, and the carrying capacity of the stream was increased by 25%. As a result, it makes it possible to increase the reliability and maintain the technical condition of using open pits.

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“…So, for example, N.E.Zhukovsky, when calculating a hydraulic shock absorber, takes the process as adiabatic and recommends taking n=1.41 [1]. In works [2,3,4,5], the authors also accept the law of compression-expansion of air in a cap as adiabatic, and other researchers [7,8,9] accept n=1.0, assuming that the process of compression-expansion of air in a cap is isothermal. At the same time, it is [11,12] that the process of compression-expansion of air in the bell proceeds according to the polytropic law.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the polytropic coefficient for hydraulic shock from a decrease in pressure

Jonkobilov¹,

Rajabov

Jonkobilov

2022

IOP Conf. Ser.: Earth Environ. Sci.

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The article provides an analysis of scientific papers on the study of a hydraulic shock absorber - an air-hydraulic cap, shows that at present there is no consensus on the choice of the numerical value of the polytropic coefficient n. In practice, during the operation of pumping stations with long pressure pipelines, in the event of a sudden power outage, water hammer often occurs to the motors of the main pumps. To prevent this phenomenon, it is convenient to apply a hydraulic shock absorber. The accuracy of calculating the shock absorber depends on the reliable value of the coefficient n. The correct selection of the numerical value of the polytropic coefficient n provides for determining the optimal dimensions of the proposed hydraulic shock absorber. There are different opinions about the choice of the numerical value of n among scientists. N.E. Zhukovsky, when calculating the hydraulic shock absorber, takes n = 1.41. V.S. Dikarevsky accepts n=1.0. Therefore, the rationale for the correct choice of the numerical value of the polytropic coefficient for calculating the absorber in the case of water hammer is very relevant. The paper presents the results of experimental studies of the polytropic coefficient n in a hydraulic shock absorber from a decrease in pressure. When conducting experiments on the study of the absorber, modern scientific instrumentation was used. At the same time, the obtained results of the experiments confirm that the variability of the value of the polytropic coefficient during hydraulic shock in the cap and the correctness of the recommendation of D.A. Fox. The conducted studies prove that the polytropic coefficient has a strictly polytropic character.

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Numerical substantiation of the parameters of the air-hydraulic hood by a diaphragm

Cited by 3 publications

References 10 publications

Hydraulic shock damper with and without diaphragm

Hydraulic shock damper with and without diaphragm

Digging and cleaning collectors using excavators equipped with innovative automatic control navigator

Experimental study of the polytropic coefficient for hydraulic shock from a decrease in pressure

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