Shock wave velocity in two-phase pressure flow

Jonkobilov, Ulugmurad; Jonkobilov, Sobir; Rajabov, Ulugbek; Bekjonov, Rozisher; Norchayev, A. J.

doi:10.1088/1757-899x/1030/1/012129

Cited by 5 publications

(3 citation statements)

References 11 publications

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“…From Equations ( 2) and (3) a wave speed of 675 m s −1 was derived from the current flow rig data, which was near half compared to the wave speed in the steel pipe counterpart [3]. It is well documented that wave speeds are reduced in plastic pipes compared to steel pipes, and the wave speed can be further reduced in multiphase flows, where the speed is dependent on the amount of nondissolved gases in the liquid [31].…”

Section: Wave Speedmentioning

confidence: 99%

High-Speed Imaging of Water Hammer Cavitation in Oil–Hydraulic Pipe Flow

Jansson

Andersson

Karlsson

2022

Fluids

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A pipe water hammer with column separation was studied in a range of flow rates (Re=465 to 2239) in a test rig with an acrylic glass observation section. Pressure transients were measured with piezoresistive pressure sensors, while the gas evaporation and condensation were captured by high-speed recording with a Photron SA-Z at a frame rate of 75,000 fps. Separation lengths were estimated by a threshold value in the images. The results did not show a sharp gas–oil interface but consisted of small, dispersed bubbles mixed with larger vapor structures, where the bubbles seemed to become smaller after each collapse. These findings differ from the transient cavitating characteristics commonly reported in nonhydraulic piping systems governed by different fluid properties and time scales. Good repeatability, both in terms of pressure transients and bubble distribution, was observed. The column separation was quantified as a metric of separation length, which was consistent between the tests. Combined with pressure measurements, these results may assist in obtaining a better understanding of the transient cavitation dynamics within oil–hydraulic systems as well as be used to improve modelling strategies towards more accurate cavitation erosion predictions.

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Section: Wave Speedmentioning

confidence: 99%

High-Speed Imaging of Water Hammer Cavitation in Oil–Hydraulic Pipe Flow

Jansson

Andersson

Karlsson

2022

Fluids

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“…and using the method of successive approximations, determine the value of the parameter σ from this equation. For the found σ, the volume of air W o in the hood is determined by the formula [4,10]:…”

Section: H H H  (9)mentioning

confidence: 99%

Analytical substantiation of the parameters of the directional air-hydraulic hood

Jonkobilov

Rajabov

et al. 2021

E3S Web Conf.

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The article is about to the calculation of the main technical parameters of the directional air-hydraulic hood. It is accepted as a mathematical model of wave equations of hyperbolic type as applied to pressure pipelines of pumping stations, and analytical solutions of wave equations for different values of the polytropic exponents are proposed. Water hammer poses a danger to the normal operation of the main equipment of stations, control and measuring equipment, control devices and pressure pipelines. To damp the intensity of water hammer in the pressure pipelines of pumping stations, we have accepted an effective design of an air-hydraulic cap. When establishing the strength indicators of pressure pipelines against hydraulic shock, it is necessary to make an accurate calculation of the main parameters of the proposed design of the air - hydraulic cap. The article presents the results of analytical and experimental studies of the accepted cap design. At the same time, an analytical method is proposed for calculating the basic dimensions of the cap. The results of the proposed calculation procedure are in good corresponding with the experimental data. This confirms the reliability of the proposed analytical calculation method.

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“…In works [13][14][15][16][17][18][19][20][21][22][23][24] various designs of AHC are described: single, double; with transition pipes; with input resistance; with cylindrical nozzles (connecting pipeline); directional action; with automatic air supply; horizontal, etc.…”

Section: Introductionmentioning

confidence: 99%

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

Bazarov

Jonkobilov

et al. 2021

E3S Web Conf.

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The article is about calculating the main parameters of air - hydraulic hoods with a diaphragm to reduce the emergency consequences of a water hammer, possible in the pressure pipelines of an irrigation pumping station. Based on the results of numerical studies by the method of finite differences of the proposed hydraulic shock absorber, dependencies were obtained based on a certain air in the absorbers, the total capacity of the cylindrical cap was determined to determine the main dimensions of the absorbers. Based on the results of numerical studies by the method of finite differences of the proposed hydraulic shock absorber, dependencies were obtained based on a certain air in the absorbers, the total capacity of the cylindrical cap was determined to determine the main dimensions of the absorbers. To determine the economic dimensions of the proposed cap design, comparative calculations of numerical experiments with experimental data prove the reliability of the proposed dependencies using the finite difference method.

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Shock wave velocity in two-phase pressure flow

Cited by 5 publications

References 11 publications

High-Speed Imaging of Water Hammer Cavitation in Oil–Hydraulic Pipe Flow

High-Speed Imaging of Water Hammer Cavitation in Oil–Hydraulic Pipe Flow

Analytical substantiation of the parameters of the directional air-hydraulic hood

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

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