The beginning of the movement of bottom sediments in an unsteady flow

Eshev, Sobir; Gaimnazarov, Isroil; Latipov, Shakhboz; Mamatov, Nurbek; Sobirov, Feruz; Rayimova, Iroda

doi:10.1051/e3sconf/202126302042

Cited by 24 publications

(10 citation statements)

References 19 publications

(6 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our experiments in an axial flow pump confirm the linear dependence of the wear ΔG of the parts of the flow path on time T. The concentration of solid particles in the flow should directly relate to the wear rate of the streamlined parts of pumping units. The results obtained at constant values φ=-30; n0=1020 rpm; Q=0.297м 3 /s; and dср=0.34 mm, confirmed the rectilinear regularity of the dependence ΔG = f (p) only for such a fixed streamlined part as a straightening vane [1][2][3]. The total wear of the impeller blade is:…”

Section: Introductionsupporting

confidence: 58%

Study of operating mode of axial and centrifugal pumps with hydroabrasive wear of parts in flow section of pumping units

Uralov,

Eshev,

Shaazizov

et al. 2023

E3S Web of Conf.

Self Cite

View full text Add to dashboard Cite

To date, a significant amount of work has been done to study the processes of cavitation and hydroabrasive wear in laboratory conditions. Using existing equations for assessing hydroabrasive or cavitation wear leads to certain inaccuracies since the action mechanism underlying them does not correspond to the actual operating conditions of hydraulic machines. Very little has been studied about the issues associated with joint and intense cavitation-abrasive wear, which always occur in fullscale hydraulic machines operating on natural watercourses with high turbidity. So far, the wear of the working bodies of centrifugal and axial pumps has been poorly studied, depending on the mode of their operation, and a methodology has not been developed for selecting operating modes, taking into account the wear of their parts. In this paper, the wear of parts of axial and centrifugal pumps in laboratory conditions is studied, and the dependences of wear on the characteristic dimensions and duration of their operation are given. The results of micrometering of the working parts of the pumps showed that the blades of the impellers along the length and width wear out unevenly both in size and shape. In axial and centrifugal pumps, the most intense wear occurs at the outlet sections of the impeller blades and their sealing elements. When pumping muddy water for 2000 hours, the sealing gaps of type D pumps with a head of 75–80 m are 2.8– 3.1 mm. With an increase in the end clearance of the impeller of an axial pump from the impact of a slotted cavitation-abrasive flow, the pressure value and the local concentration of solid particles in the flow play a leading role.

show abstract

Section: Introductionsupporting

confidence: 58%

Study of operating mode of axial and centrifugal pumps with hydroabrasive wear of parts in flow section of pumping units

Uralov,

Eshev,

Shaazizov

et al. 2023

E3S Web of Conf.

Self Cite

View full text Add to dashboard Cite

show abstract

“…According to our measurements, the flow of traction sediments in the section of the Amudarya River in the head part of the Karshi Main Channel was 10...28%, in the area of the head part the Amu-Bukhara Main Channel 5...37%. In the calculations, approximate values of the water consumptions of traction sediments in the intra-annual context can be taken: during the flood period -15 ... 20 and during the low water period -20 ... 27% of the flow of suspended sediments [12][13][14][15][16][17][18][19][20].…”

Section: Fig 1 the Current View Of The Water Intake Facility On The K...mentioning

confidence: 99%

Establishment of volume of channel silting and organization of treatment works in the conditions of Amudarya River

et al. 2023

View full text Add to dashboard Cite

The article discusses methods for ensuring guaranteed water intake and the process of sedimentation in the head sedimentation tank. Based on the results of a full-scale study of the supply channel, a recommendation was developed to improve its operation. The results of surveys of the hydraulic and alluvial regimes of sediments in the channel of supply channels are analyzed and summarized as well as the organization of cleaning work and recommendations for the appropriate placement of dredgers along the channel length. The arrangement of dredgers is carried out depending on the distribution of sediment volumes along the length of the channel, taking into account the type and performance of each dredger.

show abstract

“…Dysarz et al [27] tested forecasting of the sediment transport process, considering two main uncertainties involved in sediment transport modeling. Eshev et al [28] discussed the problems of determining the friction parameter and non-eroding conditions in a wave flow, considering them from the standpoint of an approach using a critical dynamic speed. Zhao et al [29] conducted flume scour tests regarding the discharge process of the barrier dam, and studied the scouring characteristics of wide-graded sediment under different flow conditions.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Evolution Process of Suspended Pipelines through River Bottoms under Unsteady Flow Conditions

Fu,

Xu,

Zhao

2024

Water

View full text Add to dashboard Cite

One of the major geological hazards that can cause harm to long-distance oil and gas pipelines are water-induced disasters. These disasters are quite common and widespread. Pipelines that cross river channels are at a higher risk of facing damage due to flood-induced erosion. To shed light on the evolution pattern of riverbeds adjacent to pipelines under the influence of unsteady flow conditions, a flume model test was conducted, and the underlying mechanisms of local scour were elucidated. The experimental results demonstrate that pipelines are more susceptible to suspension during flood conditions. The suspension process of pipelines under flood conditions could be broadly divided into five stages. In comparison to constant flow conditions, the evolution process of local scour and the suspension of pipelines under unsteady flow lacked the erosion pit expansion stage, and the scour duration was shorter. Each stage exhibited distinct erosion characteristics, and both the peak flow rate and the number of flood peaks significantly impacted the maximum range and depth of the erosion pit. During pipeline-laying projects, selecting a covering layer with a larger particle size can enhance the erosion resistance of the riverbed around the pipeline. The study of the local erosion process of underwater crossing pipelines under unstable flow conditions can provide a reference for pipeline engineering design and riverbed pipeline protection strategies.

show abstract

The beginning of the movement of bottom sediments in an unsteady flow

Cited by 24 publications

References 19 publications

Study of operating mode of axial and centrifugal pumps with hydroabrasive wear of parts in flow section of pumping units

Study of operating mode of axial and centrifugal pumps with hydroabrasive wear of parts in flow section of pumping units

Establishment of volume of channel silting and organization of treatment works in the conditions of Amudarya River

Experimental Investigation of the Evolution Process of Suspended Pipelines through River Bottoms under Unsteady Flow Conditions

Contact Info

Product

Resources

About